Question 1 - Which of the following are true statements about biological lipids:

Question

Question 1- Which of the following are true statements about biological lipids: (Choose all that apply)

B. Triacylglycerols can readily diffuse across cell membranes and are stored in specialized intracellular compartments

C. Unsaturated fatty acid chains pack less efficiently than saturated ones

D. Phospholipids and free fatty acids are amphipathic, whereas triacylglycerols are hydrophobic

E. Membranes containing longer fatty acid chains have higher melting temperatures than those with shorter fatty acid chains

A. At high concentrations, fatty acids and triacylglycerols form micelles, whereas phospholipids form bilayers

Question2-

Metabolism comprises both catabolic and anabolic pathways. In general, the following terms describe catabolism: (Choose all that apply)

B. biosynthetic

C. reductive

D. require ATP

E. exergonic

F. converging

A. degradative

Explanation / Answer

1) A and D are correct.because phospholipids are amphipathic and able to form bilayer in membrane and micelles in drop of water. Triglycerols are hydrophobic.

2)Catabolic pathways generate ATP and anabolic require ATP so D is wrong.Anabolism is reductive si C is wrong.

Catabolic reactions are converging (F)as they converge towards citric acid cycle and it is degradative(A) while anabolism is biosynthetic.Catabolic reactions gives out energy so they are exergonic.(E)

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