Polysome is formed by:
Correct answer: C. Several Ribosomes attached to a single mRNA
- 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
Explanation
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 Å 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.
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About Cell Structure and Function
Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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