Cell membranes and passive transport Quiz
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5 questions, one answer each
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1. Which molecule needs a carrier protein to cross a membrane?
- A. Oxygen
- B. Carbon dioxide
- C. Glucose
- D. Testosterone
2. A plant cell has π = −500 kPa and ψ = −100 kPa. What is P?
- A. +400 kPa
- B. −400 kPa
- C. +600 kPa
- D. −600 kPa
3. Why does the rate of uptake by a carrier protein level off?
- A. The concentration gradient disappears
- B. ATP runs out
- C. All carrier proteins are in use
- D. The membrane becomes fluid
4. Which is correct about osmosis?
- A. Water moves from a lower to a higher water potential
- B. Water moves through a partially permeable membrane from higher to lower water potential
- C. It needs ATP
- D. It only happens in plant cells
5. Beetroot discs leak more pigment at 60 °C than at 20 °C because:
- A. Proteins denature and the bilayer is disrupted
- B. Proteins become more active
- C. The cells divide
- D. Water is more viscous