Biology Cell MDCAT 2017
PMDC Verified Question 128 of 143
Ribosomes present in prokaryotes are:
A
80S
B
50S
C
70S
D
60S
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option C: 70S
Concept: Ribosomes are classified by their sedimentation rate in a centrifuge, measured in Svedberg units (S).

Solution: Prokaryotic cells possess slightly smaller ribosomes that sediment at 70S (composed of 50S large and 30S small subunits).

Distractor Autopsy:
  • 80S: Found in the cytoplasm of eukaryotic cells.
  • 50S & 30S: These are individual subunits, not the intact ribosome.

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