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STD 11 - 8. Cell the unit of life — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 8. Cell the unit of life1 Mark
MCQ
Polysome is formed by
  • A
    a ribosome with several subunits
  • B
    ribosomes attached to each other in a linear arrangement
  • ✓
    several ribosomes attached to a single $mRNA$
  • D
    many ribosomes attached to a strand of endoplasmic reticulum.
✓

Answer

Correct option: C.
several ribosomes attached to a single $mRNA$
c
(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 $10 -20\ Å$ 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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