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jeka94
3 years ago
12

Someone pls help me!

Biology
1 answer:
dexar [7]3 years ago
4 0

Answer:

Cell membranes are semi-permeable, which works like a sieve that determines what enters and leaves the cells.

Explanation:

It is semi-permeable and it allows molecules to diffuse inside.

<em>Feel free to mark it as brainliest :P</em>

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Ivanshal [37]

Answer:

it is expected that the mutation results in a reduced initiation of translation and thereby decreasing the level of the protein A, while it does not change the level of mRNA A

Explanation:

Translation in bacteria starts with the formation of the initiation complex which is composed of the small ribosomal subunit, the messenger RNA (mRNA), initiation factors and the initiator transference RNA (tRNA) containing N-formyl-methionine. The small ribosomal subunit binds to a polypurine stretch of variable length in the mRNA called 'the Shine-Dalgarno sequence'. A mutation in this sequence reduces the affinity of the ribosome for the mRNA, thereby, in this case, decreasing the level of protein A. Since transcription occurs before translation, it is expected that this mutation does not change the level of expression of the mRNA A.

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Hope this helps! If so please mark brainliest!

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