Ribosomes in eukaryotic cytoplasm are of which type?

A100S type

B70S type

C80S type

D55S type

Answer & Solution

Correct answer: C. 80S type

Eukaryotic cytoplasmic ribosomes are 80S (60S large + 40S small subunits). Prokaryotic ribosomes are 70S (50S + 30S). Mitochondrial and chloroplast ribosomes are 70S — an evolutionary echo of the endosymbiont theory.

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