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Ksenya-84 [330]
3 years ago
8

I really need help please don’t answer If u donr know

Biology
1 answer:
Xelga [282]3 years ago
8 0
You are actually correct it is D
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When DNA is compacted by histones into 10-nm and 30-nm fibers, the DNA is unable to interact with proteins required for gene exp
poizon [28]

Answer:

This is through the process of methylation and phosphorylation of histones tails.

Explanation:

The addition of   a methyl group  to the amino acid of the histones of the  nucleosomes   that compacted DNA  in the nucleus is  called mehtylation, while the addtion of phodpahte is phosphorylation

Its  effects  on  gene expression depends on the number of <u> methyl groups, and type of amino acid that  methylated. During transcription. </u>

<u />

The DNA double strands are compacted and therefore  hidden  from transcription factors and enzymes of transcription by the hitones  tails of the neuclosomes, Methylation  weaken the binding bonds between the tails and DNA structure ; thereby aiding the uncoiling of DNA  from the  tails.(nucleosomes).This chemical  reaction  aided  DNA  strands  exposure   to transcription factors and enzymes, for initiation of transcription. This explains the dyanmic activity of methylation

Futhermore phophorylation also favours unwrapping of DNA, by imitating   modifying enzymes e.g H3Y41E and H3T45E  and convert it to→→ H3Y41phopspahte to aid DNA unwrapping and accessibility to  transcription factors and RNA polymerase Enzymes,

5 0
3 years ago
Help me out plzzzzzz
Shkiper50 [21]
No se pero quiero respuestas perdon
4 0
2 years ago
Hurricanes form over oceans but can move onto land areas. When this happens, the storm can cause major damage to wildlife. In 19
Zanzabum

Answer:

The answer is D. The loss of biodiversity caused changes to food webs in the turtle ecosystems.

Explanation:

7 0
3 years ago
Complete the statement to describe the calcium concentration that must be maintained in human body cells.
andrezito [222]

Answer:

The calcium concentration must be greater OUTSIDE

the cell than INSIDE the cell.

Explanation:

Calcium has a vital role in the body, it is necessary for:

  • exocytosis
  • muscle contraction
  • normal excitability of neurons
  • blood coagulation
  • building and maintaining bones and teeth
  • enzymatic activity
4 0
3 years ago
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How are viruses different from bacteria?
Bess [88]
<span>A) Viruses are not alive. - yes they are alive, dead viruses are used in vaccines

B) Viruses have no protective shell. - yes, they have

C) Viruses have no lytic cycle. - this is specfic for bateria

D) Viruses do not contain DNA. - every virus contain a DNA!

your answer is C</span>
5 0
3 years ago
Read 2 more answers
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