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BotanyNEET 2025Mitochondria, plastids, ribosomes, cytoskeleton, nucleus

Cell: The Unit of Life

From the statements given below choose the correct option:

A. The eukaryotic ribosomes are 80S and prokaryotic ribosomes are 70S.

B. Each ribosome has two sub-units.

C. The two sub-units of the 80S ribosome are 60S and 40S while those of the 70S are 50S and 30S.

D. The two sub-units of the 80S ribosome are 60S and 20S and those of the 70S are 50S and 20S.

E. The two sub-units of the 80S are 60S and 30S and those of the 70S are 50S and 30S.

  1. A.A, B, C are true✓
  2. B.A, B, D are true
  3. C.A, B, E are true
  4. D.B, D, E are true

Solution

Eukaryotic ribosomes are 80S (60S + 40S) and prokaryotic ribosomes are 70S (50S + 30S); every ribosome has two subunits. Statements A, B and C are correct; D and E give wrong subunit sizes.

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