Question

The ER signal sequence on a growing polypeptide chain is recognized by a signal recognition particle (SRP) in the cytosol. This interaction:

A. causes the polypeptide chain to dissociate from the ribosome.
B. causes the ribosome to return to the pool of free ribosomes in the cytosol.
C. guides the ribosome and its polypeptide to the ER membrane.
D. speeds the synthesis of the polypeptide chain.

Answer 1

The interaction between the ER signal sequence on a growing polypeptide chain and the signal recognition particle (SRP) guides the ribosome and its polypeptide to the ER membrane.

Step-by-step explanation:

The interaction between the ER signal sequence on a growing polypeptide chain and the signal recognition particle (SRP) guides the ribosome and its polypeptide to the ER membrane.

This interaction is important for the proper targeting and insertion of the polypeptide into the rough endoplasmic reticulum (RER), where it undergoes modifications and folding.