60S and 40S subunit combine to form ________ particle.
Correct answer: C. 80 S
- A. 100 S
- B. 90 S
- C. 80 S
- D. 70 S
Explanation
In eukaryotic cells, the 60S large ribosomal subunit combines with the 40S small subunit to form an 80S ribosome. The Svedberg unit measures sedimentation behaviour, so the values are not added arithmetically as ordinary mass units, but the assembled ribosome is designated 80S. Students often choose 100S by simply adding 60S and 40S, overlooking the meaning of S units.
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