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lawyer [7]
3 years ago
5

Identify which region of histone molecules are exposed and hence may easily be modified and state the names of the key chemical

groups that can be added to histones to affect transcription regulation.
Biology
2 answers:
NeX [460]3 years ago
7 0

Answer: acetyl group, methyl group, or phosphate group

Explanation  Basically different modification can occur to  the tail regions of histone .This includes addition of the groups listed above

Dmitriy789 [7]3 years ago
6 0

Answer:

The region of the histone molecule that is easily modified is its <em>TAIL.</em>

Explanation:

Histones are a type of alkaline protein that is found on eukaryotic chromatin, packing the former naked DNA into its nucleosome unit. These proteins are both important to 1) compact the incredibly long DNA molecule and, 2) <em>regulating gene expression</em>.

The tail of a histone can suffer the addition of acetyl groups to the molecule (<em>acetylation</em>) or the addition of methyl groups (<em>methylation</em>). These modifications are relevant to the activation or deactivation of genes: acetylation binds the DNA in a much more loosely manner, making it easier for transcription factors to access to it, while methylation does the opposite and provides a tighter bond that deactivates the gene by inhibiting transcription.

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Explanation:

4 0
3 years ago
An easy way to calculate the amount of energy available at each level is to
Contact [7]

Answer:

Use the rule that 10% of the energy is transferred between layers.

Explanation:

Energy is transferred between layers of a food pyramid. That means that the  producers at the bottom of the pyramid (e.g. green plants) provide energy to the primary consumers (e.g. rabbits), which are eaten by and provide energy to the secondary consumers (e.g. foxes).

However, very little of the energy is actually transferred to the next layer, roughly 10%. So an easy way to calculate the energy available at each level is to calculate 10% of what was available from the previous level. So if there is 600 kJ available from the primary consumers, then 60 kJ are transferred to the secondary consumers

5 0
3 years ago
Which process in eukaryotic cells will normally proceed whether O2 is present or absent?
9966 [12]

Answer:

b) glycolisis

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6 0
2 years ago
Which of the following correctly describes the relationship between the stolon and hyphae in fungi?a) Hyphae produce spores, and
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<span>The answer is B. The stolon are hyphae that run horizontally and join one sporangiophore (vertically oriented hyphae with sporangia at tips)  –with rhizoids as the ‘roots’ - with the other sporangiophore in the fungi population. They are analogous to rhizoids in eukaryotic runner plants.   The attached diagram visually demonstrates this <span>description.</span></span>




5 0
3 years ago
Which of the following explains why nonrenewable energy resources are still so widely used. Select multiple
egoroff_w [7]
Non renewable resources can be very expensive, especially in capital outlay. For example, wind energy is very expensive to get started. The batteries alone are a headache. What do you do with those batteries whose life is over? How do you dispose of them? It isn't an easy problem to solve.

Then there's the labor part of wind energy. If they are manufactured in Denver Co and they receive an order from Maine, the blades require a wooden plywood box to be made. Plywood is roughly 20$ a 1/2 sheet (in Canada) to say nothing of the carpenter needed to make the box. I'm told that it takes a good day and one half just to make that box alone. That's for 1 blade. Then there's the shipping cost for 3 blades. Then there's the cost of making the blades which require highly skilled workers. 

Then there's the problem of wind, (or lack thereof). the problems just keep on going up and the expenses with them. 
6 0
3 years ago
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