Question

The following type of ribosome sub-units are present in an eukaryotic cell:

• A. 30S, 50S only
• B. 40S, 60S only
• C. 50S, 60S only
• D. 30S, 40S, 50S and 60S

Hint:

In eukaryotes, ribosomes are composed of 40S and 60S subunits, while in prokaryotes, ribosomes are made of 30S and 50S subunits.

Answer 1

The Correct Option is D

In eukaryotic cells, the ribosomes are made up of two subunits:
- The small subunit is 40S, and the large subunit is 60S.
- When these two subunits come together, they form a functional ribosome of 80S. Note that in prokaryotic cells, the ribosomes are made up of 30S and 50S subunits, which combine to form the functional 70S ribosome. However, in eukaryotic cells, the 30S and 50S subunits are not present. Instead, eukaryotic ribosomes are composed of 40S (small) and 60S (large) subunits. Thus, the correct answer is (4) 30S, 40S, 50S and 60S. This option represents the subunits involved in both prokaryotic and eukaryotic cells in different contexts.