Cell membrane structure Quiz
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5 questions, one answer each
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1. Which part of a phospholipid is hydrophobic?
- A. Phosphate head
- B. The fatty acid tails
- C. The glycerol only
- D. The carbohydrate chain
2. What is the role of cholesterol in a membrane?
- A. Receptor for hormones
- B. Forming a channel
- C. Active transport
- D. Regulating fluidity
3. Which evidence showed that proteins are embedded in the bilayer?
- A. Freeze-fracture electron microscopy
- B. The thickness of membranes
- C. The presence of phospholipids
- D. Colorimetry of beetroot
4. In the beetroot practical, which result would show a more permeable membrane?
- A. Lower absorbance
- B. No colour change
- C. Higher absorbance
- D. Smaller discs
5. Why does mixing of labelled proteins slow at low temperature in the Frye and Edidin experiment?
- A. Proteins are destroyed
- B. Phospholipids have less kinetic energy, making the membrane less fluid
- C. More cholesterol is made
- D. The membrane becomes thinner