Question

Prokaryotes have 70S ribosomes. It breaks up into two sub units whose sedimentation constants are:

• A. 50 S and 20 S
• B. 40 S and 30 S
• C. 60 S and 10 S
• D. 50 S and 30 S

Answer 1

The correct option is D

50 S and 30 S

Prokaryotes have 70Sribosomes, each consisting of a small (30S) and a large (50S) subunit. Their small subunit has a 16SRNA subunit (consisting of 1540 nucleotides) bound to 21 proteins. The large subunit is composed of a 5SRNA subunit (120 nucleotides), a 23S RNA subunit (2900 nucleotides) and 31 proteins.