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wolverine [178]
4 years ago
15

The universal regulatory mechanism in eukaryotes for controlling gene expression includes A. control of the processing of mRNA a

fter it is transcribed from DNA but before it leaves the nucleus, and control of the rate it leaves the nucleus. B. control of the genes transcribed and the rate they are transcribed. C. control of mRNA in the cytoplasm after it leaves the nucleus, including changes to mRNA before translation begins. D. control of polypeptides after they have been synthesized but before they are functional. E. All of these mechanisms are used; there is no single universal mechanism.
Biology
1 answer:
Mademuasel [1]4 years ago
3 0

Answer:

E. All of these mechanisms are used; there is no single universal mechanism.

Explanation:

Gene expression is regulated at many levels. Some of them are:

  • Chromatin remodeling regulation includes altered histone modifications such as methylation which can regulate gene expression (up or down).
  • Transcription is regulated via transcriptional factors and specificity factors such as repressors and activators.
  • RNA processing can be regulated through the alternative splicing (different introns can be excised and combinations of different exons connected)
  • Post-translational modification refers to modification of proteins after being synthesized.

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where they execute important functions. The polypeptide chain of these proteins must cross the lipid bilayer. This presents a pr
spin [16.1K]

Answer:

In this case, it is likely that the polypeptide chain assumed an alpha helix configuration because the lipid bilayer did not have beta-barrel proteins.

Explanation:

A polypeptide chain is naturally polar, however, a lipid bilayer is naturally non-polar. This makes it difficult and even prevents the polypeptide chain from crossing a lipid bilayer, since the composition of these two elements does not allow them to mix. In that case, the polypeptide chain has two options to take to successfully cross the lipid bilayer.

The first option that the polypeptide chain has is to allow the creation of twisted beta sheets in the shape of a closed barrel in its structure. This only works if the lipid bilayer has beta barrel proteins in its composition to act as a transport channel for the polypeptide chain. However, few lipid layers have this protein.

Most likely, the polypeptide chain assumes an alpha helix conformation to cross lipid bilayers that do not have beta-barrel proteins. By assuming the beta conformation, the polypeptide chain reinforces the hydrogen bonds present in its composition, allowing it to cross the lipid bilayer without having its conformation and structure disassembled.

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Semenov [28]

Answer:

The overview is defined in the clarification section elsewhere here, and according to the particular circumstance.

Explanation:

Including genetic mapping as well as tracing the characteristics of hereditary disorders, genetic markers are valuable.

Basic DNA sequence determination for chromosomes.

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  • This needs to have been Polymorphic.
  • It is indeed meant to be non-epistatic.
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