SAT Subject Biology Practice Question 106: Answer and Explanation

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Question: 106

16. Centrifugation is a laboratory technique used to separate materials by their relative masses. More massive substances will sink to the bottom of a test tube while those with less mass will float to the top. A cell culture is centrifuged. Which cellular organelle would be concentrated at the top of the centrifuged mixture?

A. Nuclei
B. Endoplasmic reticulum
C. Mitochondria
D. Ribosomes
E. Membrane-bound proteins

Correct Answer: C

Explanation:

Mitochondria are the least dense of the listed cellular organelles and will float to the topmost layer when cells undergo centrifugation.

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