Lipids Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. How many ester bonds are in one triglyceride molecule?
- A. One
- B. Two
- C. Three
- D. Four
2. Which feature makes a fatty acid unsaturated?
- A. A phosphate group
- B. A C=C double bond in the hydrocarbon chain
- C. A glycosidic bond
- D. No carboxyl group
3. Why is a thick layer of fat under the skin useful in cold climates?
- A. Fat is a good conductor of heat
- B. Fat is hydrophilic
- C. Fat is a poor conductor of heat
- D. Fat is soluble in blood
4. In a phospholipid bilayer, which part faces the watery environment?
- A. Hydrophobic tails
- B. Hydrophilic phosphate heads
- C. Ester bonds
- D. Glycerol only
5. A scientist says oxygen crosses a cell membrane more easily than sodium ions. Which explanation is correct?
- A. Oxygen is small and non-polar so passes through the hydrophobic core, whereas ions are repelled by it
- B. Oxygen is hydrophilic so dissolves in the heads
- C. Sodium ions are larger than oxygen molecules in every case
- D. Sodium ions are non-polar