Why it is said that plasma membrane is asymmetrical:
Correct answer: C. The two surfaces and halves are not identical
- A. Proteins are not fixed at their position
- B. Hydrophobic tail facing inward and hydrophilic head facing outward
- C. The two surfaces and halves are not identical
- D. Cholesterol molecules are only present inside
Explanation
The cell membrane is an asymmetric structure. That means that the two sides of the membrane are structurally and functionally different.
This question appeared on the NUMS 2022 paper, which you can sit online with every answer explained.
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About Animal and Plant Cell
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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