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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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About Cytoplasmic Organelles

Cytoplasmic organelles are the specialized structures suspended in cytoplasm, including mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes, vacuoles and centrosomes. Questions compare their structures and functions in animal and plant cells, including chloroplasts and the role of the endomembrane system in transport and secretion.

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