60S and 40S subunits combine to form what size particle?
Correct answer: A. 80S
- A. 80S
- B. 90S
- C. 100S
- D. 110S
Explanation
The 60S and 40S subunits are components of eukaryotic ribosomes. When they combine, they form the 80S ribosome, which is involved in protein synthesis. The 'S' stands for Svedberg units, a measure of sedimentation rate during centrifugation, which does not add linearly. The other options (90S, 100S, 110S) are incorrect because they do not represent the combination of these subunits in eukaryotic cells.
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