What is the function of the cholesterol in a cell surface membrane?
Correct answer: D. Regulating the flexibility at the membrane
- A. Controlling active transport
- B. Acting as a membrane blood receptor
- C. Helping cells join together
- D. Regulating the flexibility at the membrane
Explanation
Cholesterol helps to regulate membrane fluidity over the range of physiological temperatures. It has a hydroxyl group that interacts with the polar head groups of the membrane phospholipids and sphingolipids. Therefore, the correct answer is D.
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Animal and plant cells share a plasma membrane, cytoplasm, nucleus, ribosomes, mitochondria and endoplasmic reticulum, but plant cells also have a cellulose cell wall, chloroplasts and a large permanent vacuole. Questions cover organelle structure and function, differences between the two cell types, and how membranes control movement of substances.
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