Multiple Choice
During translation, where is the tRNA that is attached to the growing polypeptide chain located?
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15. Gene Expression
Introduction to Translation
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In the process of translation, what molecule binds to the P site on a ribosome?
A
Release factor
B
mRNA
C
Aminoacyl-tRNA
D
Peptidyl-tRNA
Verified step by step guidance1
Understand the structure of the ribosome, which has three sites: the A (aminoacyl), P (peptidyl), and E (exit) sites.
During translation, the ribosome facilitates the binding of tRNA molecules to these sites to ensure the correct sequence of amino acids in the growing polypeptide chain.
The P site, or peptidyl site, is where the tRNA carrying the growing polypeptide chain is located.
Peptidyl-tRNA is the tRNA molecule that is bound to the P site, holding the nascent polypeptide chain.
Recognize that the role of the P site is crucial for peptide bond formation, as it holds the tRNA with the growing chain, allowing the amino acid from the A site to be added to the chain.
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