The plasma membrane consists mainly of:
Correct answer: B. Proteins embedded in a phospholipid bilayer
- A. Phospholipids embedded in a protein bilayer
- B. Proteins embedded in a phospholipid bilayer
- C. Proteins embedded in a polymer of glucose molecules
- D. Proteins embedded in a carbohydrate bilayer
Explanation
The plasma membrane consists mainly of lipids (20-40%) and proteins (60-80%). The lipid molecules form a bilayer structure, with proteins embedded within it.
This question appeared on the ETEA MDCAT 2006 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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