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. The phosphate head
- B. The fatty acid tails
- C. The glycerol only
- D. The whole molecule
2. Which feature of the membrane regulates its fluidity?
- A. Glycoproteins
- B. Channel proteins
- C. Cholesterol
- D. Receptors
3. A beetroot disc is placed in 40% ethanol. Why does the liquid turn red?
- A. Ethanol is a red dye
- B. Ethanol disrupts membranes so pigment leaks out
- C. Ethanol makes the cells divide
- D. Ethanol is absorbed and turns red in the cell
4. What does a higher colorimeter absorbance indicate in the beetroot practical?
- A. Less pigment and a less permeable membrane
- B. No pigment
- C. More pigment and a more permeable membrane
- D. A lower temperature
5. Which observation best supports the idea that the membrane is fluid?
- A. Phospholipids form a bilayer
- B. Labelled proteins mix over the surface of a hybrid cell
- C. Membranes contain cholesterol
- D. Membranes are thin