Question

Select one which is not true for ribosomes.

• A. Made of two subunits
• B. Form polysome
• C. May attach to mRNA
• D. Have on role in protein synthesis

Answer 1

Answer: (D)

Have on role in protein synthesis

Ribosomes are cell organelles that are formed of two subunits. Cytosolic, eukaryotic ribosomes (80S) are made up of 60S and 40S subunits, while prokaryotic ribosomes (70S) are made up of $50S$ and $30S$ subunits.

They are also capable of forming polyribosomes during which many ribosomes are attached to mRNA. The purpose of ribosomes moving on mRNA is to synthesise proteins i.e., translation. Indeed, ribosomes have a very direct role in protein synthesis.

So, the correct answer is 'Have on role in protein synthesis'.