Which of the following occurs as a ribosome translocates along a mrna molecule by one codon? a. the polypeptide enters the e siteb. the trna that was in the a site moves into the p site. c. the trna that was in the a site moves to the e site and is released. d. the trna that was in the a site departs from the ribosome via a tunnel. e. the trna that was in the p site moves into the a site.

The correct answer is option B. "The tRNA that was in the A site moves into the P site".

Explanation:

In the ribosome complex for translation, the A-site (aminoacyl) acts as the point of entry for the tRNA, and the location at which the first amino acid is bound. Once the first codon has been translated into the first amino acid, The tRNA that was in the A site moves into the P-site (peptidyl). The P-site is the second binding site for the tRNA, and the location at which all the following amino acids are added.

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

1. b.

2. d.

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6. c.

these are the only ones that i know, i hope this , and good luck.