B2.1 Membranes and membrane transport Quiz
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5 questions, one answer each
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1. Which molecule crosses a bilayer by simple diffusion?
- A. Sodium ions
- B. Glucose
- C. Carbon dioxide
- D. Proteins
2. HL: Organisms living in cold habitats tend to have membranes with more:
- A. Saturated fatty acids
- B. Unsaturated fatty acids
- C. Peripheral proteins
- D. Glycoproteins
3. HL: Each cycle of the sodium–potassium pump moves:
- A. 2 Na⁺ out, 3 K⁺ in
- B. 3 Na⁺ out, 2 K⁺ in
- C. 3 Na⁺ in, 2 K⁺ out
- D. 1 Na⁺ and 1 glucose in
4. HL: Glucose absorption by sodium-dependent cotransporters is an example of:
- A. Simple diffusion
- B. Osmosis
- C. Indirect active transport
- D. Exocytosis
5. HL: The nicotinic acetylcholine receptor is an example of:
- A. A voltage-gated channel
- B. A neurotransmitter-gated channel
- C. A pump protein
- D. A glycolipid