Question

question 9
which of the following occurs at the p site in the picture above?
the mrna enters the ribosome
the mrna exits the ribosome
the peptide chain elongates
nothing

Explanation:

In ribosome structure, the P - site (peptidyl - tRNA binding site) is crucial for protein synthesis. During translation, the growing peptide chain is attached to the tRNA at the P - site. When a new amino acid - tRNA complex binds to the A - site (aminoacyl - tRNA binding site), a peptide bond is formed between the amino acid at the A - site and the peptide chain at the P - site, thus elongating the peptide chain.

• The mRNA does not enter or exit the ribosome at the P - site. The mRNA is threaded through the ribosome in a process that involves multiple sites but not specific entry/exit at the P - site as described in the first two options.
• The P - site is actively involved in the peptide chain elongation process, so the "Nothing" option is incorrect.

Answer:

The peptide chain elongates