Answer:
The positive charge of the histone proteins get reduced due to the process of histone acetylation, thus making the wrapping of DNA around the histones less tightened. The loose connected DNA afterward associates with the transcription factors for the articulation of the genes situated in that area.
Generally, when there is no requirement of gene anymore, the acetyl groups from the histones get withdrawn by the activity of histone deacetylase enzyme (HDAC9) that makes the DNA tightly wrapped and inaccessible again. In case, when less expression of histone deacetylase enzyme occurs, the process of deacetylation fails to take place. This indicates that within an immune cell, at the time of infection, the inflammatory gene, which was made available does not get re-wrapped firmly around the histones.
Which are characteristics of leeches? Check all that apply.
A. They are parasitic.
B. They are a type of roundworm.
C. They have setae.
D. They have medical uses.
E. They are segmented.
biology work im selling points pls help 50 points
Answer:
^^^ SHES CORECT IT IS "Answer: The last choice, Gravitational Pull would become weaker and weight would decrease because when out of Earth's atmosphere, objects (also animals & humans) are able to float because there isn't really a gravitational pull, and because there isn't a gravitational pull, the weight changes and it is less than it was before. But mass never changes."
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Explanation:
Why do moss grow so low to the ground?
A. They only get nutrients from the soil.
B. They like it like that.
C. They lack vascular tissue and require water for reproduction.
D. They can't photosynthesis enough energy to grow tall.
Answer:
c
Explanation:
Once DNA was shown to be the primary genetic material of life, a race among scientists took place to work out its structure. Which concept came from studying the amounts of each DNA base in different organisms?
Final answer:
The concept that came from studying the amounts of each DNA base in different organisms is base composition, which led to the discovery of Chargaff's rules.
Explanation:
The concept of studying the amounts of each DNA base in different organisms is known as base composition. Base composition refers to the relative proportions of the four DNA bases (adenine, thymine, cytosine, and guanine) in a DNA molecule. This concept was crucial in understanding the physical structure of DNA and how it accounts for the genes in different organisms.The study of base composition led to the discovery that the amount of adenine is roughly equal to the amount of thymine, and the amount of cytosine is roughly equal to the amount of guanine in a DNA molecule. This is known as Chargaff's rules. Different species have different percentages of each base, which contributes to the genetic diversity across organisms.The Meselson-Stahl experiment provided the first experimental evidence that: A. Newly synthesized DNA in E. coli has different nucleotide sequence than the parent DNA. B. DNA synthesis in E. coli proceeds by a conservative mechanism. C. DNA polymerase is required for DNA synthesis. D. DNA synthesis in E. coli proceeds by a non-conservative mechanism. E. DNA synthesis requires dATP, dCTP, dGTP, and dTTP. F. DNA synthesis in E. coli proceeds by a semi-conservative mechanism.
Answer:
the answer is a
Explan:
A major disturbance that the ecosystem was able to recover completely from. ___________________________________________________________________ A major disturbance that caused the ecosystem to stabilize at a new equilibrium. ___________________________________________________________________ A major disturbance that caused the ecosystem to completely collapse. ___________________________________________________________________
Complete Question:
I made the grass diseased. This caused all of the populations above it (rabbit, snake, and hawk) to rapidly decrease over the 12 month period
(a) A major disturbance that the ecosystem was able to recover completely from __________
(b) A major disturbance that caused the ecosystem to stabilize at a new equilibrium ____________
(c) A major disturbance that caused the ecosystem to completely collapse __________
ANSWER:
(a) reducing the hawks to nearly zero
(b) removing all of the hawks
(c) removing all the diseased.
Explanation:
(a) reducing the hawks to nearly zero will cause low depletion of the producer (plants) and this will allow the plant to grow (without visible depletion) over a period of time.
(b) for the ecosystem to stabilize at a new equilibrium, the tertiary consumer (hawks) will be totally removed from the ecosystem. Since there's no tertiary consumer to checkmate the density of other components of the food chain, it will make it form a balanced ecosystem.
(c) for ecosystem to collapse, it's important to note that the removal of the producer (plants) will be bring about the loss of the ecosystem. Since, their is no manufacturer of food, the primary consumer (rabbit) in the food chain will be starved and overtime the rabbits will be wiped out and this will caused the loss of secondary and tertiary consumer in the long run.
The ecosystem is defined as the geographical area, in which animals, microbes, plants, along abiotic components live together to maintain equilibrium.
The correct blanks for the given statements are:
(a) reducing the hawks to nearly zero
(b) removing all of the hawks
(c) removing all the diseased.
The statements can be explained as:
(a) The reduction of hawks to zero will result in the depletion of plants or producers, and it will lead to the growth of the plants over a period of time.
(b) The ecosystem will be stabilized at a new equilibrium, the tertiary consumer or hawk if totally removed from the ecological niche.
(c) The ecosystem will be collapsed if the producers or the autotrophs deplete or vanish. The manufacturing of food will be halted and consumers dependent on producers will die and resulting in the collapse of the ecosystem.
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A large power point burns coal to generate electricity for nearby homes and businesses.
This contributes most directly to which short-term human-induced envrionmental change?
Answer:
Pollution
Explanation:
Burning of coal contributes most directly to an environmental change described as pollution.
Pollution is generally defined as the presence of substance in the environment at a level that disrupt the normal biotic functioning of the environment. Pollutants are substances whose level of concentration in the environment affects the normal biotic functioning of the environment.
The burning of coal leads to the release of harmful substances to the environment. These substances could be in form of gases such as oxides of carbon, sulfur and nitrogen that are capable of causing acid rain and global warming, heavy metals such as mercury and lead, as well as particulate matters.
Heavy metals are harmful to organisms when they find their ways into the food chains while particulate matters in the atmosphere reduce visibility and are capable of causing damages to properties when they are deposited on them.
Ashes remains from coal burning are also capable of causing pollution to nearby lakes and water bodies when they are washed down. This will lead to the disturbance of lives in the aquatic environment and decrease the quality of the water bodies for various uses.
Some areas of an ocean are known as dead zones. These zones form when excess organic material decomposes. This increased decomposition uses up the oxygen from the water. Which human activity is most affected by the increasing number of dead zones in the ocean?
A.
Offshore oil drilling, because water in dead zones is toxic
B.
Commercial fishing, because fish cannot survive without oxygen
C.
Commercial shipping, because dead zones change the course of ocean currents
D.
Sand mining, because oxygen is not available to form the sands on ocean beaches
The human activity that should be most affected by the rising no of dead zones should be option b.
What is commercial fishing?It is the activity where the fish should be caught out also the other seafood for the commercial food.
In the case when it gives the large number of quantity of food with respect to the various countries that should be around the earth.
hence, we can conclude that The human activity that should be most affected by the rising no of dead zones should be option b.
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The correct option is B i.e. Commercial fishing, because fish cannot survive without oxygen
Commercial fishing is most affected by the increasing number of ocean dead zones because fish cannot survive in areas depleted of oxygen. Dead zones are caused by eutrophication and human activities such as fertilizer runoff.
A dead zone is a section of a freshwater or marine ecosystem where a significant portion of the native vegetation and animals has disappeared. Eutrophication, oil spills, the disposal of hazardous substances, and other human activities can all result in these zones. There were more than 400 dead zones in existence as of 2008; this number has been rising for a while. Fertilizer runoff from the Mississippi River basin has generated a dead zone spanning over 8,463 square miles in the Gulf of Mexico off the coast of the United States, which is one of the worst dead zones in the world. The Chesapeake Bay in the eastern United States is one of the lake and bay ecosystems that are badly impacted by fertilizer runoff containing phosphate and nitrate.The human activity most affected by the increasing number of dead zones in the ocean is commercial fishing because fish cannot survive without oxygen (Option B).What is the role of DNA in transmitting genetic information? Describe DNA’s important genetic role in few sentences below.
Explanation:
DNA is a nucleic acid molecule that is composed of nucleotides. The nucleotide is composed of four different types of nitrogenous bases, a phosphate group, and the deoxy-ribose sugar.
The DNA molecule is used by the organism to store the information of organisms for a long time. The nitrogenous base in the DNA codes for different types of amino acids in the organism which can form proteins. The proteins can perform various roles in the organism. The DNA molecule is transmitted through reproduction in the organism.
3. One type of muscle contraction results in a stabilizing force. This:
A. Enables us to stand and sit upright
B. Means it helps us to lift heavy things
C. Makes the muscle very tense
Answer:it’s actually A NOT B so please choose A
Explanation:
Are there granules in all cells
Answer:
no, not all cells
Explanation:
some white blood cells don't have granules in their cytoplasm, agranulocytes lack granules.
QUESTION 5
What is a stem cell?
O A. a hollow, fluid filled ball of cells
OB-a cell that can give rise to more cells of its kind, along with at least one specialized cell
o C. an exact genetic copy
O D.a cell that can give rise to other types of cells
Answer: B
Explanation: I would say that it is B because when i looked up the definition it said that the stem cell was able to give arise to more cells of the same type but i might be wrong.
Question 5 (1 point)
What best describes the role of transpiration in plants?
Producing food molecules
Capturing the energy in sunlight
Maintaining water balance
Breaking down food molecules
Answer:
maintaining water balance
The map shows the distribution of wild boars in the United States. Wild boars are an invasive species to the United States. A map of the United notes showing the distribution of wild boars in dark orange. Wild boars appear most often in Texas, California, and Florida, and along the southern notes. Which of these facts about wild boars is best supported by the evidence provided? Wild boars were brought to the United States by humans. Wild boars have quickly spread through the United States. Wild boars have established successfully in areas with warm climates. Wild boars have a high reproductive rate and no natural predators.
Answer:
Wild boars have successfully established in areas with warm climates.
Explanation:
As you can see in the description of the map shown in the question above, wild boar, although an invasive species in the USA, settled more easily in Texas, California and Florida, and along the southern notes, which are regions that usually have a climate hot most of the year. This means that wild boars have greater affinities with warm climate regions within the country.
An invasive species is one that is taken to a region where it does not occur naturally. These species can become real pests if the invaded environment does not have natural predators that limit their multiplication.
Answer:
C) on edge 2020
Explanation:
:)
The image below shows part of an ocean current in the Atlantic Ocean. The blue line represents the motion of deep, cool water. The red line represents the motion of warm surface water.
One factor that affects ocean currents is the concentration of salt in the water. How can the saltiness of the water cause the surface water to sink, as shown above?
A.
When cold water rises to the surface, it loses salt.
B.
When ice melts, it makes the surface water less salty.
C.
When the surface water is heated by the Sun, it dissolves more salt.
D.
When some of the surface water freezes, the remaining water becomes saltier.
Answer: the answer is "when some of the surface water freezes, the remaining water becomes saltier."
Explanation:
Why is the movement of basic elements in
ecosystems different from the transfer of
energy?
Answer:
Chemical nutrients and energy tend to flow in the same direction for most of an ecosystem. The big difference is that the chemical nutrients are ultimately recycled in the ecosystem while the energy is ultimately lost from the ecosystem to the universe at large. Energy in any ecosystem ultimately comes from the Sun
Explanation:
While energy passes through the biosphere and can never be regenerated, elements may. This makes the movement of nutrients through the biosphere distinct from the transfer of energy.
What is the movement of basic elements in ecosystems?
The main distinction is that while the energy is ultimately lost from the ecosystem to the larger universe, the chemical nutrients are ultimately regenerated in the ecosystem.
Energy changes forms as it flows through an ecosystem, but no new energy is produced.
Similar to how matter cycles throughout an environment, no new matter is created as atoms are rearranged into other molecules. As a result, energy and matter are preserved throughout all ecosystem processes.
Therefore, the movement of basic elements in ecosystems, different from the transfer of energy.
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Part 1: Below is a pedigree that is used to trace sickle cell anemia in a family. Analyze the pedigree and answer the following questions. Use the key to help you answer the questions. Carriers have not been marked.
When you drop a rubber ball, gravity pulls the ball to the floor. When the ball hits the floor, it becomes
deformed and stores some of the energy it had. This energy helps the ball bounce back. What sequence
describes these energy changes?
O
A. kinetic
potential - kinetic
potential
O
B. potential - kinetic
potential - kinetic
O
C. potential - kinetic → thermal
potential
D. thermal
kinetic
potential
kinetic
Final answer:
The correct sequence of energy changes when a rubber ball is dropped and bounces is gravitational potential energy to kinetic energy, then to a mix of potential and kinetic energy during deformation, and back to kinetic energy as it bounces, losing some energy as heat.
Explanation:
When you drop a rubber ball, it undergoes a series of energy transformations. Initially, the ball has gravitational potential energy due to its height. As it falls, this potential energy is converted into kinetic energy. When the ball hits the floor, it becomes deformed, temporarily storing energy, some of which is elastic potential energy (like the energy in a spring) and some of which is thermal energy due to friction and the deformation process. As the ball bounces back, it reconverts its elastic potential energy into kinetic energy, which is then converted back into gravitational potential energy as it rises. However, not all energy is perfectly conserved in its original forms; some is dissipated as thermal energy due to friction and deformation, explaining why the ball does not return to its original height. Consequently, the correct sequence that describes these energy changes is B. potential - kinetic - potential and kinetic - potential and kinetic - kinetic - potential.
The bones in the wings of a bat are the same as the bones found in the paws
of raccoon, though their function is quite different. The similarity is evidence
that the bat and the raccoon-
Answer:
the bat and the racoon share a common ancestor.
Explanation:
what is described in this question are homologous structures, which indicate common ancestry. hope this helps!
The bones in bat wings and raccoon paws serving as homologous structures indicate a common evolutionary ancestor. Conversely, analogous structures like bat and insect wings evolved independently through convergent evolution.
Explanation:The question is exploring the concept of homologous structures, which is a fundamental idea in comparative anatomy and evolutionary biology. The similarity in skeletal structures between the wings of a bat and the paws of a raccoon indicates that they share a common evolutionary ancestor, despite the different functions their limbs have evolved to fulfill. This indicates a common evolutionary past and is evidence of divergent evolution, where related species evolve different traits.
In contrast, structures that are similar in function and appearance but do not share an origin in a common ancestor, like the wings of bats and insects, are called analogous structures. These arise through convergent evolution, where similar environmental pressures result in similar solutions in unrelated lineages.
How do air masses form?
Answer:
Air masses can cover hundreds of thousands of square miles. Air masses are formed when air stagnates for long periods of time over a uniform surface. The characteristic temperature and moisture of air masses are determined by the surface over which they form. An air mass acquires these attributes through heat.
Answer
Air Masses are formed when air stagnates are in the air for a long time over a uniform surface
Indicate whether the following statements are true or false. If a statement is false, explain why it is false. A. Generally, the total number of nonpolar amino acids has a greater effect on protein structure than the exact order of amino acids in a polypeptide chain. B. The "polypeptide backbone" refers to all atoms in a polypeptide chain, except for those that form the peptide bonds. C. The chemical properties of amino acid side chains include charged, uncharged polar, and nonpolar. D. The relative distribution of polar and nonpolar amino acids in a folded protein is determined largely by hydrophobic interactions, which favor the clustering of nonpolar side chains in the interior.
A. False. The order in which amino acids are linked is unique for each protein and isthe most important factor in determining overall protein structure.
B. False. Peptide bonds are planar amide bonds that are central to the polypeptide
backbone formation. The atoms in the amino acid side chains are not considered
to be part of the backbone.
C. True.
D. True.
A. The total number of nonpolar amino acids has not a greater effect on protein structure than the exact order of amino acids in a polypeptide chain is the false statement.
B. The atoms that form peptide bonds (which are a component of the backbone) and the atoms that link them are collectively referred to as the "polypeptide backbone". This backbone is made up of N-C-C.
C. The chemical properties of amino acid side chains having charged, uncharged polar, and nonpolar is the true statement.
D. The relative distribution of polar and nonpolar amino acids in a folded protein which is determined largely by hydrophobic interactions is the true statement.
Therefore, the correct options for A, B, C and D are False, False, True and True respectively.
The structure and function of a protein are influenced more by the particular amino acid sequence in its polypeptide chain than by the total amount of non-polar amino acids. "Polypeptide backbone" includes the N–C–C backbone as well as the atoms that bind to peptide bonds to generate them.
Amino acid side chains can be classified as having charged, uncharged polar or non-polar groups and exhibit a variety of chemical characteristics. Protein folding is fundamentally influenced by hydrophobic interactions, which cause nonpolar amino acids to assemble inside the protein, thereby improving stability and structure.
Therefore, the correct options for A, B, C and D are False, False, True and True respectively.
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What does the arboreal hypothesis suggest about the reason why primates have the unique features, such as opposable thumbs, that they have on their hand?
Answer:
Arboreal hypothesis suggest that primates have the unique features, such as opposable thumbs which occurs due to the adaptation of the body to the external environment.
Explanation:
Primates are those organisms that have some unique characters which are not present in other mammals such as their brain has big in size and there is a gap between fingers which helps them to hold things more precisely and tightly. These organisms belongs to kingdom animalia, class mammalia and order primates. Example of primates are monkeys and humans etc.
Answer:
This is the the physical adaptation to survive in this habitat(in the air/on the trees). the opposite thumbs allows easy grasping of three branches for locomotion within the trees, and from tree to tress,to easily pick up any objects, and to eat with one hands while maintaining balance on the tree with another hands.
Thus this opposable thumbs ensures precision and power.
Explanation:
Please help me I put 25 points
Explanation:
SORRY I AM NOT SURE
Which of these diseases can be treated with antibiotics?
*Lyme Disease
*The common cold
*Influenza
Answer:
The answer would be the Lyme Disease. This is because the common cold and influenza can't be treated with antibiotics.
Will mark Brainliest and 5 stars (:
Use the drop-down menus to select the storm that causes each environmental hazard.
Flash flood
Storm surge
Answer:
1. Thunderstorm
2. hurricane
Explanation:
Answer:
thunderstorm, hurricane
Explanation:
he or she above is right
Please use the following case for questions.
You are at your son’s baseball game when another boy’s dad experiences dizziness and nearly faints in the stands next to you. You tell him that you are a paramedic and will walk him to your car where you have your medical equipment. He reports that he has had a headache off and on since he had a tooth extracted four days ago. This evening he is feeling very weak. His blood pressure is normal. When you listen to his heart you note that he has a pronounced murmur. He reports having had rheumatic fever 15 years ago. You examine his fingernails and find one that has tiny petechial hemorrhages under it.
1. Which cardiovascular infectious condition is this?2. What is the most likely causative organism and the route of transmission?3. What the connection, if any with rheumatic fever?4. Why did you look at his fingernails?5. What type of culture would a physcian most likly order and why?
Answer:
Explanation:
a) the cardiovascular condition is sabacute endocarditis
b) It is caused by a type of streptococcus called streptococcus viridians and transmitted through the opening of the wound
c) rheumatic fever can lead to damage to the heart and this damage allows bacteria to attach itself to the heart. Streptococcus viridians are often caused by bacteria hence there growth can be favorite by rheumatic fever.
d) the nails is used to check the blood stream, and should be check for capillary heamorrhage
e) He would order for BAP- Bacteria Agar plate that is used mostly to classic streptococcal bacteria.
In a rainforest food chain, caterpillars and butterflies eat orchid plants. Toucans eat the caterpillars and butterflies. Leopards eat the toucans.
Which statement describes the energy in this food chain?
Answer: it’s C
Explanation:
Answer:c
Explanation:
Three different reptile skulls with a common ancestor show that the skull changed from having no holes behind the eye to having one hole, and then two holes behind the eye.
What conclusion did scientists draw about the reptile?
Answer:
the skull evolved as the aw got stronger
Explanation:
Answer:
A) The skull evolved as the reptile developed stronger jaws.
*Edge 2021* Did the exact quiz!!
Which of the following reproduces by injecting its material into a
host cell? *
Parasite
Virus
Bacterium
Microorganisms
The answer is Virus because they latch itself onto the host
It is proposed that the periplasmic space of gram-negative bacteria is iso-osmotic relative to the cytosol. If true, this poses a challenge for these cells when having to deal with turgor pressure. For example, it is generally believed that the rigid periplasmic peptidoglycan layer of these cells could resist the force of turgor pressure if it were exerted outward across the inner plasma membrane; thus, preventing plasma membrane lysis. However, if the periplasm is iso-osmotic with the cytosol, as proposed, the outer membrane must be under stress from the outward force of turgor pressure. Given that it is not thought that the outer membrane is built to withstand high turgor pressure, propose a plausible mechanism for how these cells resist lysis of the outer membrane in the face of high, outward turgor pressure force.
Answer:
In case of these gram-negative bacteria, the outer membrane (made of lipid) is firmly bound to the cell wall (made of peptidoglycan). This structure is responsible for maintaining cell integrity against the turgor pressure faced from the outside. Since this outer layer is more permeable to substances moving across the membrane, the next layer - the inner membrane - also adds support to withstand turgor pressure. It will not let an osmolyte (such as sucrose) diffuse through it, thereby maintaining the osmotic pressure in the periplasmic space.
Hope that answers the question, have a great day!