16) The most abundant lipid in animal cell membranes are A) steroids. B) phospha

Question

16) The most abundant lipid in animal cell membranes are A) steroids. B) phosphatidylcholine. C) phosphatidylserine. D) cholesterol. 17) Which of the following would be the least favored movement of lipids in a membrane? A) lateral B) flip-flop C) flexing D) rotation 18) Proteins that span the entire phospholipid bilayer are considered A) monolayer-associated. B) lipid-linked. C) transmembrane. D) peripheral. 19) Where does most new membrane synthesis take place in a eukaryotic cell? A) in the Golgi apparatus B) in the Endoplasmic reticulum C) in the plasma membrane D) in the mitochondria 20) Membrane synthesis in the cell requires keeping certain types of lipids on one side or the other of the membrane. Which group of enzymes accomplishes this task? (A)flippases (B) phospholipases (C) convertases (D) glycosylases 21) Which of the following substances is most commonly used to help purify (isolate) a membrane protein from the membrane? (A)high salt solutions (B) sucrose (C) detergents (D)ethanol 22) The breakdown of glucose to pyruvate by a cell is an example of what type of reaction? A) anabolic B) aerobic C) catabolic D) apoptotic

Explanation / Answer

Answer 16. Phosphatidylcholine is the most abundant lipid molecule in the biological membranes.

Answer 17. Flexing is the least favored movement of lipids in a bilayer.

Answer 18. Transmembrane proteins span entire phospholipid bilayer.

Answer 19. New membrane synthesis takes place in the Endoplasmic reticulum.

Answer 20. Flippases help in movement of lipids in bilayer cell membrane.

Answer 21. Detergent is used to isolate a membrane protein from biological membranes.

Answer 22. Catabolic. Glycolysis, glycogenolysis and citric acid cycle are examples of catabolic reactions.

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