Pick up the choice which is true about subunits of eukaryotic ribosomes:
Correct answer: A. The larger subunit sediments at 60S while the smaller subunit sediments at 40S
- A. The larger subunit sediments at 60S while the smaller subunit sediments at 40S
- B. The larger subunit sediments at 50S, while the smaller subunit sediments at 30S
- C. The larger subunit sediments at 60S, while the smaller subunit sediments at 30S
- D. The larger subunit sediments at 50S, while the smaller subunit sediments at 40S
Explanation
The correct answer is that the larger subunit of eukaryotic ribosomes sediments at 60S, and the smaller subunit sediments at 40S. These specific sedimentation rates are unique to eukaryotic cells and distinguish them from prokaryotic ribosomes, which have sedimentation rates of 50S for the larger subunit and 30S for the smaller. The incorrect options either describe prokaryotic ribosomes or mix parts of the sedimentation rates from both eukaryotic and prokaryotic ribosomes, making them incorrect for this question.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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