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.
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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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