311C F11 Exam3PQ - Bio311C Exam 3 Practice Questions...

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Bio311C Exam 3: Practice Questions Multiple Choice. 1. Integrins are transmembrane proteins that interact with the extracellular matrix and the cytoskeleton. When the integrin protein is first synthesized, on which side of the ER membrane will the cytoskeleton-binding domain be found? a. It will be on the cytoplasmic side of the ER. b. It will be on the side facing the interior of the ER. c. It could be facing in either direction because the orientation of proteins is scrambled later on. d. It doesn't matter, because the integrin is not active in the ER. e. Not enough information is provided to answer this question. 2. The role of oxygen in our cells is to a. catalyze reactions in glycolysis. b. produce CO2 c. form ATP. d. accept electrons from the electron transport chain. e. react with glucose to split water. 3. Which statement about pyruvate is not true? a. It is the end product of glycolysis. b. It is reduced during fermentation. c. It is a precursor of acetyl CoA. d. It is the end product of the citric acid cycle. e. It contains 3 carbon atoms. 4. Phosphofructokinase is an allosteric enzyme that catalyzes the conversion of fructose-6-phosphate to fructose-1,6-bisphosphate, an early step of glycolysis. In the presence of oxygen, an increase in the amount ATP in a cell would be expected to a. inhibit the enzyme and thus slow the rates of glycolysis and the citric acid cycle. b. activate the enzyme and thus slow the rates of glycolysis and the citric acid cycle. c. inhibit the enzyme and thus increase the rates of glycolysis and the citric acid cycle. d. activate the enzyme and increase the rates of glycolysis and the citric acid cycle. e. inhibit the enzyme and thus increase the rate of glycolysis and the concentration of citrate. 5. What is the oxidizing agent in the following reaction: Acetaldehyde + NADH + H+ Ethanol + NAD+ a. Acetaldehyde b. NADH + H+ c. Ethanol d. NAD+ 6. Which of the following statements is (are) correct about an oxidation-reduction (or redox) reaction? a. The molecule that is reduced gains electrons. b. The molecule that is oxidized loses electrons. c. The molecule that is reduced loses electrons. d. The molecule that is oxidized gains electrons. e. Both A and B are correct. 7. One function of both alcohol fermentation and lactic acid fermentation is to a. reduce NAD + to NADH. b. regenerate pyruvate. c. oxidize NADH to NAD + . d. release the rest of the stored energy in pyruvate. e. transfer electrons to the electron transport chain. 8. Aerobic and anaerobic energy harvesting both make ATP by which of the following? a. Substrate-level phosphorylation. b. Chemiosmotic phosphorylation. c. Regeneration of NAD+. d. Energy coupling redox reactions with an electron transport chain. 9. Which of the following statements best describes the relationship between photosynthesis and cellular respiration?
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311C F11 Exam3PQ - Bio311C Exam 3 Practice Questions...

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