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.
This question appeared on the HEC Phase II 2017 paper, which you can sit online with every answer explained.
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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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