Question

Polysome is formed by

• A. a ribosome with several subunits
• B. ribosomes attached to each other in a linear arrangement
• C. several ribosomes attached to a single mRNA
• D. many ribosomes attached to a strand of endoplasmic reticulum.

Answer 1

Answer: (C)

Ribosomes may occur in rosettes or helical groups called polyribosomes or polysomes (Gk. Poly - many, soma - body). The different ribosomes of a polyribosome are connected with a 10 - 20 A thick strand of messenger or mRNA and its maintenance requires energy. Polyribosomes are formed during periods of active protein synthesis when a number of copies of the same polypeptide are required.