The lysosome is the organelle in eukaryotic cells that serves as the recycling center. It contains enzymes that break down waste materials and cellular debris. The other organelles each have their own unique functions.
Explanation:The organelle in eukaryotic cells considered to be the recycling center is the lysosome. Lysosomes serve as the cell's waste disposal system. They contain enzymes that break down waste materials and cellular debris. Although each of the listed organelles has a distinct and important role, when it comes to the recycling function specifically, the job is carried out predominantly by lysosomes.
The Golgi apparatus is involved in packaging and shipping proteins, while the nucleus4 is the control center of the cell that stores DNA. Mitochondria are involved in energy production, and the smooth endoplasmic reticulum helps detoxify substances and produces lipids for the cell.
Learn more about Cell Organelleshttps://brainly.com/question/32304389
#SPJ6
In eukaryotic cells, lysosomes can be considered the 'recycling centers' due to their function in the breakdown and recycling of cellular materials. Other organelles listed have diverse functions ranging from energy production (mitochondria), synthesis of proteins and lipids (endoplasmic reticulum), and DNA storage and regulation (nucleus).
Explanation:The organelle that is considered the recycling center of a eukaryotic cell is the lysosome. Lysosomes contain hydrolytic enzymes which allow them to break down and digest waste materials and cellular debris within the cell. They are involved in processes such as autophagy, a process of cellular self-digestion where they break down and recycle aging organelles, hence the nickname 'recycling centers'.
Golgi apparatus functions as a 'post office' for the cells where it modifies, sorts, and packages proteins and lipids for transport to their specific destinations. The nucleus houses the DNA of the cell and governs the cell's activity through gene expression. Mitochondria are often referred to as the power plants of the cell because they produce the cell's energy currency, ATP. The smooth endoplasmic reticulum synthesizes carbohydrates, lipids, and steroid hormones; detoxes medications and poisons; and stores calcium ions.
Learn more about Lysosomes here:https://brainly.com/question/37036170
#SPJ6
An estimated 1 million bats have died from white nose syndrome ( WNS). What is one environmental impact on the immediate ecosystem?
The dying out of one million bats because of the white nose syndrome will have multiple environmental impacts. The bats are predators of the insects, thus they control their numbers. Taking in consideration how fast of a metabolism the bats have, and how often they need to eat because of it, we can see that they have huge importance in controlling the numbers of the insects. Once the bats are gone though, the populations of insects will explode. This will cause destruction of lot of populations of plants. As the plants are destroyed, the ecosystem may totally crumble as the plants are the basis of it by being the producers and providing the primary food source for the majority of the animals. This can lead to to totally destroyed ecosystem which will need lot of time to recover.
A family decides that they want to produce chihuahuas with long hair. identify a procedure that could be used to make sure that the puppies all have long hair.
Answer: Selectively breeding
Explanation:
Selective breeding is the best method, breed two dogs with dominant phenotypes if they want to produce chihuahuas with long hair.
What is selective breeding?Choosing parents with specific traits to breed with one another in order to generate kids with more desired traits is known as selective breeding.
The goal of selective breeding is to produce cattle with desirable features that are strongly heritable and can thus be passed down from generation to generation.
It is done in the following manner: A male and female organism that exhibits the desired trait (for example, high meat output) is chosen.
The parents are then bred together to create offspring. The kids that share the desired trait are chosen and bred with one another.
Therefore, through selective breeding breed, two dogs with dominant phenotypes are the best procedure.
Learn more about breeding, here:
https://brainly.com/question/8773271
#SPJ6
How can blocked coronary arteries lead to a myocardial infarction?
Answer: Myocardial infarction is said to occur when the amount of circulated blood that get to certain part of the heart decreases or blood did not get to those areas at all. This usually lead to the destruction of the heart muscles. Another term for myocardial infarction is heart attack. Myocardial infarction usually occur as a result of blocked coronary arteries. Coronary arteries are the ones responsible for supplying blood to the heart muscles. These coronary arteries can become narrowed or blocked as a results of atherosclerosis. When the arteries are blocked, it becomes impossible to get oxygenated blood to the heart and this leads to myocardial infarction.
Which of the following causes populations to shift most quickly from an exponential to a logistic population growth?
a. favorable climatic conditions
b. removal of predators
c. decreased death rate
d. competition for resources
Answer:
d. competition for resources
Explanation:
Exponential population growth is a growth which constantly increase (growth rate is the same no matter how large population is). It is the type of growth in which resources are unlimited (that is rare case) and a great example is bacterial growth. On the other hand, logistic growth decrease as resources become limited. Carrying capacity is the limit that population reaches.
So, when there is competition for resources in the population, at a certain point of time population will reach its carrying capacity and limit the growth.
Exponential growth is represented with J-shape, while logistic is represented with S-shape.
Competition for resources causes populations to shift most quickly from exponential to logistic growth.
Explanation:The correct answer is d. competition for resources. In a population, as resources become limited, individuals must compete with one another for those resources. This competition leads to a decrease in the availability of resources, which in turn slows down population growth and causes a shift from exponential to logistic population growth.
Learn more about Population growth here:https://brainly.com/question/34334668
#SPJ3
What happens to the water that is left behind after evaporation?
Answer:I gets less dense
Explanation:When you leave it out, it is going to get less dense. For example, if you have a toy car and it got less dense than water, it would float. If the toy car was more dense than the water, it would sink. The denser something is, the heavier. The less dense it is, the lighter.
What is the main difference between the two hypotheses for the origin of the eukaryotic cell?
Answer:
The main difference between the two hypotheses for the origin of the eukaryotic cell is whether the nucleus appear before or after the endosymbiotic event
Explanation:
There are two major hypothesis for the origin of eukaryotic cell (cell withe the membrane-bound organelles and nucleus):
Hypothesis 1 or Archaezoan hypothesis- this hypothesis suggest that the eukaryotes with nucleus appeared prior to the endosymbiotic eventsHypothesis 2 or Symbiotic hypothesis- this hypothesis suggest that endosymbiotic event lead to the formation of eukaryotic cell (prokaryotic cell engulfed other prokaryotes aerobic bacteria, which became mitochondrion/chloroplast) but that nucleus was formed after the event.What is the name of the process during which a bond between two monomers is broken?
Answer:
Hydrolysis
Explanation:
Hydrolysis is the process that involves the broken down of polymers into monomers using water molecules during the breakdown. In hydrolysis, molecule that is made up of multiple sub-units is broken down into two in which one molecule gain an hydrogen atom while the other gain hydroxyl group which were both donated by water. Furthermore, hydrolysis involves the breakdown of molecules and generally release energy.
DNA and RNA are structurally similar but also have some notable differences. RNA has uracil in place of thymine as one of its bases, uses ribose in place of deoxyribose, and
A. is a polymer of nucleotides and amines.
B. has a different phosphate group in its backbone.
C. often exists as a single-stranded molecule.
D. can't form base pairs.
RNA is structurally similar to DNA, but has some notable differences. RNA is typically single stranded, uses ribose in place of deoxyribose, and has uracil instead of thymine as one of its bases.
Explanation:Structurally speaking, ribonucleic acid (RNA), is quite similar to DNA. However, whereas DNA molecules are typically long and double stranded, RNA molecules are much shorter and are typically single stranded. RNA molecules perform a variety of roles in the cell but are mainly involved in the process of protein synthesis (translation) and its regulation.
RNA is typically single stranded and is made of ribonucleotides that are linked by phosphodiester bonds. A ribonucleotide in the RNA chain contains ribose (the pentose sugar), one of the four nitrogenous bases (A, U, G, and C), and a phosphate group. The subtle structural difference between the sugars gives DNA added stability, making DNA more suitable for storage of genetic information, whereas the relative instability of RNA makes it more suitable for its more short-term functions. The RNA-specific pyrimidine uracil forms a complementary base pair with adenine and is used instead of the thymine used in DNA. Even though RNA is single stranded, most types of RNA molecules show extensive intramolecular base pairing between complementary sequences within the RNA strand, creating a predictable three-dimensional structure essential for their function.
Learn more about RNA structure here:https://brainly.com/question/13552129
#SPJ6
The correct answer to the differences between DNA and RNA is option C: RNA often exists as a single-stranded molecule. DNA and RNA both share a phosphate group and a pentose sugar; however, RNA has ribose and uracil instead of deoxyribose and thymine, respectively, and is usually single-stranded not double-stranded like DNA.
DNA and RNA are both nucleic acids and are structurally similar, but there are several differences between them. While both are composed of nucleotides that contain a phosphate group, a 5-carbon sugar, and a base, the sugar in RNA is ribose, which has an additional -OH group compared to the deoxyribose found in DNA. Additionally, RNA replaces thymine (T) with uracil (U), which also pairs with adenine (A).
Turning to the question, the key differences between DNA and RNA are that RNA contains uracil instead of thymine, ribose instead of deoxyribose, and it is usually single-stranded. Among the options provided, the correct answer to the question is:
C. often exists as a single-stranded molecule.
While RNA can form base pairs internally, giving it a unique three-dimensional structure that is essential to its function, it does this as a single-stranded molecule. Therefore, option D, which suggests RNA can't form base pairs, is incorrect. Option A is incorrect because RNA is a polymer of nucleotides, but not of amines—amines can be a part of the bases but are not components of the RNA backbone. Option B is incorrect since both DNA and RNA have the same basic phosphate group in their backbone.
1. An unknown element is found and it cracks in half when hit by a hammer. How would you classify this element?
2. An unknown element is a gas. Knowing what you know about the elements on the periodic table, this would most likely be what type of element?
3. An unknown element is brittle and conducts electricity. It is most likely what type of element?
4. How can you differentiate between the atomic # and mass?
1. An unknown element is found and it cracks in half when hit by a hammer. How would you classify this element?
This element could be classified as a Metalloid or Non-metal.
2. An unknown element is a gas. Knowing what you know about the elements on the periodic table, this would most likely be what type of element?
The element is most likely a noble gas, as the majority of gasses in the periodic table are in this category.
3. An unknown element is brittle and conducts electricity. It is most likely what type of element?
Metalloids are brittle and somewhat conductive.
4. How can you differentiate between the atomic # and mass?
The atomic number is how many protons an element has, while the mass is the average number of between isotopes neutrons. The mass is always greater than the atomic number.
An unknown element that cracks in half when hit by a hammer would be classified as a brittle element. A gas element would most likely be classified as a nonmetal. An element that is brittle and conducts electricity would likely be classified as a metalloid.
Explanation:An unknown element that cracks in half when hit by a hammer would be classified as a brittle element. Brittle substances are those that break or shatter easily when subjected to stress or impact. Unlike malleable materials, brittle materials do not deform or bend when force is applied to them.
An unknown element that is a gas would most likely be classified as a nonmetal. Nonmetals are typically gases or brittle solids. They are poor conductors of heat and electricity.
An unknown element that is brittle and conducts electricity would likely be classified as a metalloid. Metalloids are elements that have both metallic and nonmetallic properties. They are semi-conductors of electricity and can be brittle or malleable.
The atomic number of an element represents the number of protons in the nucleus of an atom, while the atomic mass represents the average mass of the atoms in a sample of that element. Atomic number is unique to each element and determines its place on the periodic table, while atomic mass can vary due to isotopes.
How do animals obtain usable nitrogen why is it important
Animals generally consume organic stuff that is rich in proteins, amino acids, and other nitrogen-containing substances in order to receive usable nitrogen.
Animals require nitrogen to create and maintain their own proteins, DNA, RNA, and other important components.
Animals receive nitrogen through consumption of either plants, other animals, or both. Inorganic nitrogen from the soil can be taken up by plants and converted into proteins and amino acids.
Therefore, food moves through the digestive process before being absorbed. Amino acids are formed from proteins and other nitrogen-containing substances.
Learn more about Amino acids, refer to the link:
https://brainly.com/question/31872499
#SPJ12
Animals obtain nitrogen through consumption of plants and other animals that have converted nitrogen into biologically usable forms through a process called biological nitrogen fixation. This nitrogen is then utilized for building proteins and nucleic acids. Nitrogen is an essential part of life as it contributes to the creation of basic biological structures.
Explanation:Animals obtain usable nitrogen primarily through ingesting plants or other animals which contain nitrogen within their biomolecules. This nitrogen is resultant from a process called biological nitrogen fixation (BNF) where macroorganisms such as prokaryotes in the soil or cyanobacteria convert atmospheric nitrogen into ammonia. This ammonia can then be taken up by plants and converted into amino acids and ultimately into proteins.
Animals that eat these proteins break them down, extract the nitrogen, and use it to build their own structures, including their own nucleic acids and proteins. Excessive nitrogen is expelled as waste in the form of ammonia, urea, or uric acid, depending on the species of animal. Ultimately, the nitrogen cycle continues as these wastes are broken down further by additional microorganisms and returned back to the atmosphere.
Nitrogen is crucial for life because it is a key component of nucleic acids (like DNA and RNA) and proteins which are fundamental building elements in the body. Without nitrogen life as we know it could not exist.
Learn more about Nitrogen Cycle here:https://brainly.com/question/37350210
#SPJ3
Which of these animals has only one ear? Mole lemur praying mantis snail
Answer:
The animal with only one ear is PRAYING MANTIS.
Explanation:
The praying mantis belongs the class insecta. Its body parts is divided into head, thorax, abdomen, legs and antennae. A praying mantis also has one ear, which is located on the center part of its chest. With the help of this one ear, the praying mantis is capable of hearing ultrasonic sounds that are above 20,000 Hertz.
The most diverse biomass is found in which two biomes?
Answer:
The most diverse biomass is found in the tropical rain forests and the ocean.
Explanation:
The most diverse biomass is found in the tropical rainforest and coral reef biomes.
Explanation:The two biomes with the most diverse biomass are the tropical rainforest and the coral reef biomes.
The tropical rainforest biome has a high diversity of plant and animal species due to its warm temperatures, high rainfall, and abundant sunlight. It is home to a wide range of organisms, including insects, birds, mammals, and reptiles.
The coral reef biome is characterized by a diverse community of coral, fish, and other marine organisms. Coral reefs support a large variety of plant and animal species and are considered one of the most productive and biodiverse ecosystems on Earth.
Learn more about Biomes here:https://brainly.com/question/35935094
#SPJ3
How many chromosomes does a bacterium have
Answer:
A bacterium has 2 chromosomes.
How can a substitution mutation change a protein?
Answer:
by altering codon to stop codon or changing the codon for one amino acid into codon for another amino acid
Explanation:
A point mutation is a mutation within DNA sequence when a single nucleotide is changed (substitued, deleted, added). They can have various effects depending on the type of point mutation. For example, nonsense mutations are point mutations that result in a premature stop codon. UAC codon codes for the tyrosine amino acid, while UAG is stop codon. As a consequence, of mutation (UAC to UAG) protein product is usually unfunctional because it is incomplete.
Missense mutation is a type of mutation that changes codon into codon that codes for another amino acid. This type of mutation can result in nonfunctional protein.
Which of the following is a product of cellular respiration?
A)energy
B)oxygen
C)light
D)lactic acid
B) oxygen
Respiration is defined as the movement of oxygen from the outside air to the cells within tissues
Cellular respiration produces carbon dioxide, water, and ATP through the breakdown of glucose in the presence of oxygen. Hence, the correct option is A.
During cellular respiration, glucose is oxidized to produce these products along with energy in the form of ATP.
Another important product of cellular respiration is the net total of 36 or 38 molecules of ATP that can be generated from one molecule of glucose under aerobic conditions.
Cellular respiration is a key process in cells where glucose is broken down in the presence of oxygen to produce energy in the form of ATP, carbon dioxide, and water.
A yeast cell that forms a bud is called the "mother cell." Why is there no mother cell after a paramecium divides?
Answer: A)
Explanation:
Viruses can only be studied in detail using a(n) _____.
A. magnifying glass
B. light microscope
C. electron microscope
D. compound microscope
Electron microscope is the answer.
Answer:
C.) Electron Microscope
Explanation:
Density involves the amount of a material in a certain volume. When a material changes phases, it changes in density in a predictable way as the amount of material stays the same but the molecules get farther apart or closer together. Water has solid and liquid states that do not follow these predictions of density in the phases of matter.
What does that mean about the densities of the phases of water?
Water is unique because its solid state (ice) is less dense than its liquid state, contrary to most other substances. This is due to the open hexagonal structure formed by hydrogen bonds among water molecules in ice. This unique property allows ice to float on water, providing important ecological benefits.
Explanation:Water is unique among substances because of how its density changes between its solid and liquid states. Unlike most substances that become denser when they transition from liquid to solid, water becomes less dense as it freezes. This anomalous behavior is due to the hydrogen bonds among water molecules, which create an open hexagonal structure in ice, causing it to expand and thus decrease in density. This is why ice floats on water. The phenomenon where liquid water reaches its maximum density at about 4°C, rather than continuing to increase in density up to the freezing point, is another unique property of water.
Typically, substances are most dense in their solid state because their molecules are tightly packed. However, the molecular structure of ice means that its molecules are arranged in a way that takes up more space than when the same number of water molecules is in liquid form. This counterintuitive property is a direct result of the ability of water molecules to form hydrogen bonds, acting as spacers that push the molecules apart farther than when they are in the liquid state. This explains the crucial life-supporting phenomenon of ice floating on water, which insulates the water below and provides a habitat for various forms of marine life during freezing weather conditions.
The various hormones secreted by the anterior pituitary that regulate the secretion of hormones from other endocrine organs are called __________.
Answer:
tropic hormones
Explanation:
Anterior pituitary is the anterior lobe of the pituitary gland (hypophysis). It is also called the adenohypophysis. The secretions of the adenohypophysis are involved in the contol of many biological fuunctions: growth, stress, reproduction etc. Two major groups of hormones from the adenohypophysis are:
Tropic hormones-regulate the secretion of hormones from other endocrine organs (Thyroid-stimulating hormone-TSH, Adrenocorticotropic hormone ACTH, Luteinizing hormone LH, Follicle-stimulating hormone-FSH)Trophic hormones-regulate the growth (TSH-stimulates the growth of thyroid gland and ACTH which stimulates the growth of the adrenal cortex).How long is hepatitis b virus capable of surviving in a dried state on environmental surfaces?
The answer is one week
Question 10(Multiple Choice Worth 2 points)
(03.07 MC)
Which of the following is true regarding neural and endocrine responses?
Endocrine: faster and shorter in duration; neural: slower and longer in duration
Neural: faster and shorter in duration; endocrine: slower and longer in duration
Endocrine: larger scale responses in body; neural: smaller scale responses in body
Endocrine: smaller scale responses in body; neural: larger scale responses in body
Question 11(Multiple Choice Worth 2 points)
Answer:
Neural: faster and shorter in duration
Endocrine: slower and longer in duration
Explanation:
The nervous system is responsible for transmitting nerve impulses through the molecules that manufacture and secrete neurons, called neurotransmitters. This information is transmitted through the nervous way
The responses of the nervous system are fast, brief and very specific, associated with responses of movement and sensory perception
The endocrine system is characterized because it controls its functions through chemicals called hormones. It is responsible for very diverse functions, associated with metabolism and growth.
These responses tend to be slower than those of the nervous system but of longer duration, since it comprises functions that are regulated slowly.
Final answer:
The neural system responds rapidly with brief duration due to neurotransmitters, while the endocrine system's hormone-induced responses are slower to unfold but have a longer-lasting effect.
Explanation:
The question is asking to compare neural and endocrine responses in terms of speed and duration. From the provided information, we understand that the nervous system is capable of quick, brief actions such as movement, sensation, and cognition due to the rapid speed of electrical and chemical signaling through neurotransmitters. In contrast, the endocrine system typically produces responses that take longer to manifest but last much longer, utilizing hormones that are carried through the bloodstream to target cells.
Therefore, the correct answer is: Neural: faster and shorter in duration; endocrine: slower and longer in duration.
Which statement about ecosystems is FALSE? Most ecosystems get energy from the sun. Ecosystems are units of nature. Ecosystems are closed systems. All of these statements about ecosystems are false. None of these statements about ecosystems are false
Answer:
Ecosystems are closed systems.
Explanation:
Ecosystems are the open systems as there is exchange of heat with the surroundings. The solar energy enters the ecosystems and part of it is trapped by photosynthetic organisms.
The solar energy is transformed into the chemical energy of organic nutrients by the process of photosynthesis. The part of the energy released by breakdown of these nutrients is used by organisms to perform vital functions while rest of it is lost to space in the form of heat.
Since there is exchange of energy with their surroundings, ecosystems are open systems.
Ecosystems are closed systems is false. Therefore, option (C) is correct.
Ecosystems are open systems because they exchange heat with the surroundings. Solar energy goes into ecosystems and some of it gets caught by photosynthetic organisms.
Photosynthesis transforms solar energy into organic nutrients' chemical energy. Organisms use some of the energy released from breaking down nutrients to carry out important functions, but the rest of the energy is lost as heat into space.
Ecosystems are considered open systems because they exchange energy with their surroundings.
Learn more about ecosystems, here:
https://brainly.com/question/31459119
#SPJ6
how many chambers in a frog heart?
Answer:
A frogs heart has 3 chambers. Two atria and a single ventricle.
Answer:
Ah, easy! I study frogs, ya know. Okay, so a frog's heart has chambers! I read it in a National Geographic animal encyclopedia. Credit Dr. Lucy Spelman.
Explanation:
Here's some other facts - The heart is dark red, The chambers include two atria and one ventricle. I could go one forever, but I won't. Hope you get an A+!
Although bulimia nervosa is often referred to as the "binge-purge" disorder, this is misleading because
Answer:
there are other ways to compensate for binges that don't involve purging
Answer:
Not all bulimics binge before purging.
In order to adequately control the chain reaction in a nuclear power plant, it is necessary to have within the fissionable material a non-fissionable material that _____ neutrons.
a. contributes
b. absorbs
c. reflects
d. emits
e. slows down
Answer:
B
Explanation:
In a chain reaction of radioactive decay, more and more neutrons are produced that bombard more nuclei causing them to split (decay). This how a nuclear core releases more and more energy. The purity of the radioactive core determines the chain reaction and rate of energy released. A few impurities (nonfissionable material) are introduced to absorb excess neutrons (and regulate their numbers) to prevent overheating of the core.
The elbow joint is extremely stable because
The bony surfaces of the humerus and ulna interlock, the articular capsule is very thick, the capsule is reinforced by stout ligaments
The elbow joint is highly stable due to its design as a uniaxial joint and the support it receives from various ligaments that prevent side-to-side movements and resist hyperextension. These include the ulnar and radial collateral ligaments and the annular ligament that supports the head of the radius at the proximal radioulnar joint.
Explanation:The elbow joint is extremely stable due to its design and supporting structures. It is a uniaxial joint that allows for flexion and extension of the forearm. The stability of the elbow joint comes from the way the slightly rounded end of one bone fits into the slightly hollow end of the other bone, as seen in joints.
The elbow includes the humeroulnar joint and the humeroradial joint. Its stability is further enhanced by several ligaments, including the ulnar collateral ligament, and the radial collateral ligament which support the medial and lateral sides of the elbow respectively, preventing side-to-side movements and resisting hyperextension of the elbow.
Moreover, the proximal radioulnar joint, which is a pivot joint allowing for rotation of the radius during forearm pronation and supination, is supported by the annular ligament that surrounds the head of the radius to hold it in place. These attributes contribute to the high stability of the elbow joint.
Learn more about Elbow joints here:https://brainly.com/question/2515322
#SPJ6
A mutation that results in a single amino acid substitution in the active site of an enzyme
A) may alter the ability of a noncompetitive inhibitor to bind to the enzyme.
B) may change the substrate specificity of the enzyme.
C) may alter the ability of an allosteric regulator to alter enzyme activity.
D) may alter the ????G for the reaction catalyzed by the enzyme.
Answer:i think it would be c
Explanation:
A mutation that results in a single amino acid substitution in the active site of an enzyme may change the substrate specificity of the enzyme.
The active site of an enzyme is the region where the substrate binds and is converted into the product. The amino acids in the active site are specifically chosen to interact with the substrate and to catalyze the reaction.
A mutation that results in a single amino acid substitution in the active site of an enzyme may change the shape of the active site and prevent the substrate from binding. This can change the substrate specificity of the enzyme, meaning that the enzyme will only be able to catalyze the reaction with a different substrate.
The other answer choices are incorrect.
Option A is incorrect because a noncompetitive inhibitor binds to a site other than the active site of the enzyme.Option C is incorrect because an allosteric regulator binds to a site on the enzyme that is separate from the active site.Option D is incorrect because the ∆G for a reaction is determined by the free energies of the reactants and products, and is not affected by a mutation in the enzyme.To know more about the Enzyme, here
https://brainly.com/question/13004771
#SPJ2
1. A future offspring has just been conceived. When does it have the highest level of potency?
A. Pluripotency
B. Totipotency
C. Unipotency
D. Multipotency
Totipotent cells represent the stage where a future offspring has the highest level of potency, being able to differentiate into any cell type in an organism. option B) is the correct answer.
A future offspring that has just been conceived exhibits its highest level of potency at the stage known as totipotency. This stage refers to the ability of a single cell to develop into all the cell types of an organism, including both the somatic cells and the placenta.
Totipotent cells are present at the earliest stages of embryonic development, specifically in the fertilized egg itself and the first few cells that result from its division. As development progresses, cells become pluripotent, then multipotent, oligopotent, and eventually unipotent, reflecting a decrease in their potential to differentiate into different cell types.
Receptors for acetylcholine are located on the
Answer:
plasma membrane of the target cell
Explanation:
There are two main types of acetylcholine (ACh)receptors:
muscarinic ACh receptors (because muscarin as agonist) which are G-protein coupled receptors that initiate slow response. Mostly, they are located in the central nervous system-CNS (involved in the release of neurotransmitters), heart (control of the heart rate), smooth muscles (contraction).nicotinic ACh receptors (nicotin is agonist) which are ligand-gated ion channels involved in the fast response. They are located at neuromuscular junctions but also in CNS (involved in synaptic transmission between two neurons).The fruit fly Drosophila melanogaster has a haploid chromosome number of n = 4, and 2n = 8. Chromosome IV in this species is a tiny autosome. Flies trisomic for chromosome IV are fertile and have no apparent defects. The eyeless (ey) and gawky (gw) loci are tightly linked on chromosome IV. Loss-of-function ey− and gw− alleles are recessive to ey and gw, respectively. Flies homozygous for ey− lack eyes, and flies homozygous for gw− have disrupted circadian rhythms. Consider a male fly trisomic for chromosome IV, with each of the three chromosome copies bearing different allele combinations for these two loci: If this trisomic fly is the progeny of a male fly of genotype (ey+ ey−, gw+ gw−) crossed to a female fly with genotype (ey− ey−, gw− gw−), what can you conclude about the events that led to its formation? (3 points) A. Nondisjunction occurred in the female parent at the meiosis I division to produce an (n+1) egg that fused with a normal (n) sperm. B. Nondisjunction occurred in the male parent at the meiosis II division to produce an (n+1) sperm that fused with a normal (n) egg. C. Nondisjunction occurred in the female parent at the meiosis II division to produce an (n+1) egg that fused with a normal (n) sperm. D. Nondisjunction occurred in the male parent at the meiosis I division to produce an (n+1) sperm that fused with a normal (n) egg.
Answer:
D. Nondisjunction occurred in the male parent at the meiosis I division to produce an (n+1) sperm that fused with a normal (n) egg.
Explanation:
Since female fly is homozygous for both loci, ey, gw and trisomic fly have three different allele combination, we can conclude that nondisjunction occurred in male fly.
Nondisjunction (inability of chromosomes to separate) occurred during the meiosis 1 when chromosome pairs failed in separation. As a consequence, gamete (in this case male gamete-sperm) is formed with with one extra chromosome (n+1).