A plant cell can "BLANK" substances between its internal and external environment.
a) randomly transfer
b) selectively transfer
What is the importance of the cell cycle for organisms? check all that apply. growth of organisms creation of new organisms repair of damaged cells reproduction of new cells?
Answer:
a. growth of organisms
c. repair of damaged cells
d. reproduction of new cells
Explanation:
edg 2022
The cell cycle is critical for the growth, creation, repair, and reproduction of cells in organisms, ensuring genetic continuity and regulated development. The cycle includes specific phases for DNA replication and cell division, crucial for organism development and maintenance.
Explanation:The importance of the cell cycle for organisms is multifaceted and includes several critical biological processes such as the growth of organisms, the creation of new organisms, the repair of damaged cells, and the reproduction of new cells. This complex series of events ensures the continuity of life from one generation to the next. During the cell cycle, genomic DNA is replicated, allowing each new cell to have a complete set of genetic instructions. This cycle is composed of phases which include growth (G1), DNA synthesis (S phase), further growth and preparation for division (G2), and the actual division process (mitosis or meiosis).
All multicellular organisms rely on cell division for growth and, in many cases, the maintenance and repair of cells and tissues. This same fundamental process is also used by single-celled organisms as their method of reproduction. The mechanisms involved are highly regulated to prevent errors that can have severe consequences, such as cancer.
When a sea horse sees a predator, it’s nervous system kicks into high gear. Which structure is responsible for transmitting signals from one nerve cell to the next?
A. Ribosome
B. Golgi body
C. Cell membrane
D. Nucleus
The structure responsible for transmitting signals from one nerve cell to the next is cell membrane. Thus, option C is correct.
What is cell membrane?
Cell membrane has been defined as a wall that has differentiate and protect the inner structure of the cell from the outer environment. The main function of the cell membrane has to keep away the toxic material out from the cell. The cell membrane must contain channels as well as receptors that provides permission to only selective permeable membrane to enter into the cell.
The nerves has been arranged in the form of branches which starts from the spinal cord and distributed in all over the parts of body.The location where the brain and spinal cord had been located has also known as the dorsal body cavity and these two parts of the body play a vital role in the communication of all parts of the body.
Therefore, The structure responsible for transmitting signals from one nerve cell to the next is cell membrane. Thus, option C is correct.
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If a cell is like a school, then the nucleus would be
Answer:
principle or the front office
Explanation:
Describe the distribution of charge within an atom and how the subatomic particles contribute.
can you explain more please?---------------
The evolution of which characteristic allowed for the development and enlargement of complex internal organs? segmentation tissue body cavity exoskeleton
The answer is body cavity.
Correct answer: Body Cavity
The evolution of the body cavity allow the development of complex internal organs. It provides space to the organs to be contained in and perform their functions. In all the large and complex organism the body cavity is strong and and spacious in order to prevent organs from squishing into one another.
Hence, the correct answer would be Body Cavity.
A eukaryotic gene was inserted into the dna of a bacterium. the bacterium then transcribed this gene into mrna and then translated the mrna into protein. the protein produced was useless and contained many more amino acids than the protein made by the eukaryotic cell. why?
The complete set of genetic instructions in an organism's chromosomes is called the
Unlike herbivores, carnivores
A. have jaws that primarily move from side to side.
B. have flattened molars.
C. have noticeably large pointed canines.
D. have incisors.
C. have noticeably large pointed canines.
Explanation;Carnivores re animals the feed on flesh of other animals.Carnivores have biological adaptations that help them get their prey. For example, they have large, powerful jaws, with large pointed canines that help them bring down large animals such as deer. Other carnivores such as cougar have powerful paws with sharp claws that help them catch prey. Long, sharp teeth help them gran and rip apart their prey. Birds such as hawks hunt using their claws, they also have curved beaks that they can use to tear apart their prey.Describe how viruses, eukaryotic cells, and prokaryotic cells are related in terms of size.
Viruses are the smallest structures and cannot be seen through a light microscope. Prokaryotic cells are larger, averaging 1 - 5 micrometers, and do not have a nucleus. Eukaryotic cells are the largest, averaging 10 - 100 micrometers, and have a nucleus and other organelles enclosed within membranes.
Explanation:In cellular biology, viruses, eukaryotic cells, and prokaryotic cells are all structures that can contain genetic material, but they differ significantly in terms of size. Viruses are the smallest of the three, typically ranging from about 20 to 300 nanometers in diameter, and are so small that they can't be seen through a light microscope.
Prokaryotic cells, such as bacteria, are larger, generally ranging from 1 - 5 micrometers. They lack a nucleus, and their genetic material is not enclosed within a membrane.
Eukaryotic cells, like those found in humans and plants, are the largest, with a typical diameter ranging from 10 - 100 micrometers. They contain a nucleus and various other organelles all enclosed within membranes.
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Which enzymes in the citric acid cycle catalyze oxidative decarboxylation reactions?
In the citric acid cycle (also known as Kreb’s Cycle), the enzyme that catalyzes oxidative decarboxylation reactions is α-Ketoglutarate dehydrogenase. The oxidative decarboxylation reaction is the irreversible stage of the citric acid cycle; it generates NADH (equivalent of 2.5 ATP), and regenerates the 4C chain (CoA is excluded).
Researchers indicate that excessive amounts of cortisol may result in the development of gigantism.
T
F
Answer:
false
Explanation Gigantism is caused due to the overproduction of growth hormones such as Somatotropin by the pituitary glands due to a damaged control mechanism.
Which scientist warned about the misuse of synthetic pesticides?
Explain how the reduction in dopaminergic signaling that could precede the development of motor symptoms in pd could explain the "parkinsonian personality
People with Parkinson’s disease often times develop certain personality characteristics which can be linked to the reduction of dopamine transmitters in their nervous system. This causes problems in motor movements. As a result, this group of people commonly have traits such as being passive, rigid, orderly, persistent and novelty-seeking.
Personalities who are suffering from Parkinson’s disease usually exhibit specific character traits which can be associated with the loss of dopamine transmitters in their neurotic system. Such a loss creates problems in movements of the motor. In short such people generally have features like remaining submissive, firm, arranged, determined and originality-seeking.
The cell uses the process of what to move large amounts of waste out of the cell quickly.
dna and rna interact in the process of protein formation.which is a correct description of a step in protein synthesis that involves the action of nucleic acids?
a.dna molecules move into the cytoplasm to produce transfer rna
b.messenger rna is made on a dna template by the process of transcription
c.transfer rna functions to proofread rna to eliminate errors during replication
d.the original code for proteins is contained in rna which is transcribed and translated by dna
Nutrition functional foods can be placed into two categories: _____ and ______.
Nutrition functional foods can be placed into two categories: conventional foods and modified foods.
Explanation:Nutrition functional foods can be placed into two categories: conventional foods and modified foods.
________ a superior projection on the ________ bone, attaches to the dura mater and secures the brain within the skull. ________ a superior projection on the ________ bone, attaches to the dura mater and secures the brain within the skull. sella turcica, sphenoid crista galli, sphenoid crita galli, ethmoid sella turcia, ethmoid
Crista galli a superior projection on the ethmoid bone attaches to the dura mater and secures the brain within the skull.
Further Explanation:
The skull is the bony structure which protects the brain from shock and the gap between the skull and the brain is filled with cerebrospinal fluid. The ethmoid bone is a sieve like structure and spongy in appearance which is one of the eight bones of the cranial group of bones. It forms the anterior part of the cranial floor which acts as the medial wall between the orbits. The structures formed by ethmoid bone include crista galli, olfactory foramen, cribriform plate, superior nasal concha and middle nasal concha.
Crista galli is a triangular process which is a point of attachment for the falx cerebri of the dura mater. The outermost layer of the meninges is the dura mater where falx cerebri is the largest folds out of four folds of the dura mater.
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Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Human Anatomy
Keywords:
Crista galli, falx cerebri, dura mater, meninges, ethmoid bone, skull, brain, cerebrospinal fluid, cranial floor.
Explain why enzyme controlled reaction stop at very low very high pH
Final answer:
Enzyme-controlled reactions stop at very low and very high pH due to denaturation of the enzyme.
Explanation:
Enzyme-controlled reactions stop at very low and very high pH due to denaturation of the enzyme.
At very low pH values, the acidic conditions cause the enzyme to lose its native structure and function. The hydrogen ions in the solution disrupt the hydrogen bonds and ionic interactions that maintain the enzyme's active site.
Similarly, at very high pH values, the alkaline conditions cause the enzyme to lose its structure and function. The hydroxide ions in the solution can remove essential hydrogen ions from the enzyme, disrupting its active site and preventing it from catalyzing the reaction effectively.
The area of the brain that undergoes the most maturation during adolescence is the
When using the scientific method, what should be the first step?
Answer:
Observation
Explanation:
The scientific method is a series of steps or procedure through which scientists come to conclusion about the natural world.
Chronologically, the scientific method involves the following steps:
ObservationFormulation of hypothesis from observationTesting of hypothesis through experimentationConclusionHence, the first step is observation.
The nurse is caring for a client who comes to the clinic with tinea corporis, for which the prescriber orders clotrimazole. what education about this medication should the nurse provide?
Compare the reaction times for voluntary vs. involuntary activation of the quadriceps muscle. what might account for the observed differences in reaction times? outline what has to occur in the body for each reaction to occur. refer to your drawing from step 23. information from the flow chart you created in activity 2.2.1 might also be helpfu
The involuntary action or reflex of the quadriceps muscle is actually much faster than that of the voluntary action. This is because involuntary reflex action does not have to take the time of travelling to our brain before the action is created. While the voluntary response requires us first to feel the stimuli, decide what to act, and then send an impulse to the muscle in order to act.
The voluntary activation involves conscious control, while involuntary activation is reflexive. Central nervous system processing and spinal reflexes contribute to differences.
In voluntary activation of the quadriceps muscle, the initiation of movement is under conscious control.
This process involves complex signaling from the brain to the muscles. The key steps include:
Decision-Making: The brain, particularly the motor cortex, makes a conscious decision to activate the quadriceps muscle.
Motor Neuron Activation: Signals from the motor cortex travel down the spinal cord to activate motor neurons in the anterior horn.
Neuromuscular Junction: Motor neurons release neurotransmitters, such as acetylcholine, at the neuromuscular junction.
Muscle Fiber Activation: Acetylcholine binds to receptors on muscle fibers, initiating an action potential that leads to muscle contraction.
Involuntary activation, particularly through a reflex arc, is a rapid and automatic response to a stimulus without conscious involvement. The steps include:
Sensory Receptor Stimulation: A stimulus, such as a tap on the patellar tendon, activates sensory receptors called proprioceptors.
Sensory Neuron Activation: Sensory neurons transmit signals to the spinal cord.
Motor Neuron Activation: In the spinal cord, interneurons relay the signal to motor neurons, bypassing the brain.
Neuromuscular Junction: Motor neurons stimulate muscle fibers to contract, causing the reflexive extension of the quadriceps.
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n peas, yellow seed color (Y) is dominant to green seed color (y). A homozygous green pea plant is crossed with a heterozygous yellow pea plant. What is the predicted phenotypic ratio of the offspring?
The predicted phenotypic ratio of offspring from crossing a homozygous green pea plant with a heterozygous yellow pea plant is 1:1, resulting in 50% yellow and 50% green pea plants.
Explanation:When a homozygous green pea plant (yy) is crossed with a heterozygous yellow pea plant (Yy), the predicted phenotypic ratio of the offspring can be determined by using a Punnett square analysis. The genotype of the green plant can only produce gametes with the recessive allele (y), while the yellow plant can produce gametes with either the dominant (Y) or the recessive allele (y). The Punnett square analysis would show that there is a 1:1 ratio of yellow to green phenotypes among the offspring since the heterozygous parent can pass on the dominant yellow allele (Y) with a probability of 50%, leading to yellow offspring, or the recessive green allele (y) also with a probability of 50%, leading to green offspring.
Final answer:
The predicted phenotypic ratio of offspring from a cross between a homozygous green pea plant and a heterozygous yellow pea plant is 50% yellow and 50% green seeds, as per Mendelian genetics and Punnett square analysis.
Explanation:
Predicted Phenotypic Ratio in Pea Plants
When a homozygous green pea plant (yy) is crossed with a heterozygous yellow pea plant (Yy), the predicted phenotypic ratio of the offspring would involve yellow and green seeds. In this cross, each parent contributes one allele for the seed color trait. The Punnett square analysis of this monohybrid cross reveals that the offspring will have a 1:1 ratio of yellow to green seeds since yellow (Y) is dominant over green (y). Half of the offspring will inherit a Y allele from the yellow parent and a y allele from the green parent, resulting in a yellow phenotype (Yy), and the other half will receive a recessive y allele from each parent, resulting in a green phenotype (yy).
The phenotypic ratio for this cross is therefore 50% yellow and 50% green seeds. This demonstrates a classic Mendelian inheritance pattern where a single trait is controlled by two alleles with one being dominant over the other.
The energy used by sperm to move up the fallopian tube is stored in the _____ of the sperm's midpiece.
The energy used by sperm to move up the fallopian tube is stored in the epididymis of the sperm's midpiece. The epididymis is a tube located at the back of the testicles. During ejaculation, the sperm move from the lower part of the epididymis. They have not been activated by products from the prostate gland yet, and they are not able to swim. However, they are transported through the peristaltic action of muscle layers within the vas deferens. They are mixed with the diluting fluids of the seminal vesicles and other accessory glands before ejaculation.
What are at least three ways a toxin can enter an animals body??
The three ways on how toxins can enter an animal’s body is:
1. Oral Entry. This is through the mouth- the food they eat or the liquid they drink.
2. Derma Entry. This is through skin and the eyes.
3. Respiratory Entry. This is through the mouth and nose.
an elements atomic number is 62. how many protons would an atom of this element have
Explain how the appearance of the chromatogram might change if the chromatographic paper were initiallywet with water or had come in contact with the skin
Final answer:
The appearance of a chromatogram could be negatively affected if the chromatographic paper is wet or contaminated by skin contact, leading to uneven solvent front advancement and irregular sample migration, which disrupts the separation process.
Explanation:
When conducting paper chromatography, the condition of the chromatographic paper is crucial for achieving a clean separation of compounds. If the paper were initially wet with water, the starting condition for chromatography would be disrupted. The water would interfere with the movement of the solvent (the mobile phase) and the sample, possibly leading to uneven solvent front advancement, and it might solubilize the sample differently, altering the travel rate of the components. This could result in a smeared or distorted chromatogram.
Contact with skin oils can similarly alter the chromatography process. The oils could create regions on the paper with different affinities for the sample and the solvent, which can affect adsorption and cause irregular migration of the sample during solvent elution. Therefore, it's essential to handle paper chromatography materials with clean gloves to avoid contamination that can lead to a problematic chromatogram.
Which of the following blood vessels uses elasticity to push blood further along the bloodstream?
A) Arteries
B) Capillaries
C) Varicose veins
D) Atrioventricular node
If you were looking at epithelial tissue in an are of the body where exchange of gases takes place, would you expect to see simple or stratified tissue?
Final answer:
In areas of the body where gas exchange occurs, one would expect to find simple epithelial tissue, specifically simple squamous epithelia, which allows for efficient diffusion due to its single layer of cells.
Explanation:
When looking at epithelial tissue in an area of the body where the exchange of gases takes place, such as the lining of the lungs or the walls of the alveoli, you would expect to see simple epithelial tissue, specifically simple squamous epithelia. This type of tissue is organized as a single layer of cells, allowing for more efficient diffusion of gases due to the minimal thickness and larger surface area relative to volume. In contrast, stratified epithelial tissue is formed by several layers of cells and is not suited for areas of gas exchange as it is thicker and designed for protective roles, such as on the outer layer of the skin. It is important to note that some epithelial tissues may appear stratified due to the different levels of their nuclei; this is known as pseudostratified epithelium. An example of this is found in the respiratory tract, where such cells are equipped with cilia and goblet cells to move mucus and trap irritants, thereby offering protection to underlying tissues.