Percentage of proteins in cell membrane is____________?
Correct answer: C. 60-80%
- A. 20-40%
- B. 40-50%
- C. 60-80%
- D. 80-100%
Explanation
Membrane composition varies among cell types, but proteins commonly make up about 60 to 80 percent of the membrane's dry mass because they form channels, carriers, receptors and structural components. Students may choose 40 to 50 percent by recalling an approximate lipid percentage rather than the protein proportion.
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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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