Question

This prokaryotic subunit is a mitt-like globular structure with three distinct projections - a "central protuberance," the "stalk" or L1, and a ridge known as the "L7/L12 ridge." The catalytic peptidyl transferase center is located at the bottom of a deep cleft here. The tunnel shows where the growing polypeptide chain transits.

A. 30S subunit
B. 50S subunit
C. Small ribosomal subunit
D. Large ribosomal subunit

Answer 1

The 50S ribosomal subunit is the prokaryotic subunit referred to, and it plays a key role in protein synthesis by forming peptide bonds and providing a pathway for the growing polypeptide chain. The correct option is B.

Step-by-step explanation:

The prokaryotic subunit that is described as a mitt-like globular structure with three distinct projections - a "central protuberance," the "stalk" or L1, and a ridge known as the "L7/L12 ridge" - is the 50S ribosomal subunit. This subunit is part of the ribosome in prokaryotic cells, where protein synthesis takes place.

The catalytic peptidyl transferase center, which is located at the bottom of a deep cleft in the 50S subunit, is responsible for peptide bond formation during protein elongation. The tunnel within this subunit shows the path of the nascent polypeptide chain as it is being synthesized. Therefore, the correct option in this case is B. 50S subunit.