Photosynthesis & Cellular Respiration Quiz, Exams of Cellular and Molecular Biology

Download Photosynthesis & Cellular Respiration Quiz and more Exams Cellular and Molecular Biology in PDF only on Docsity! Photosynthesis  &  Cellular  Respiration  Quiz       1. 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. 2. Cellular respiration harvests the most chemical energy from which of the following? a. substrate-level phosphorylation b. chemiosmotic phosphorylation c. converting oxygen to ATP d. transferring electrons from organic molecules to pyruvate e. generating carbon dioxide and oxygen in the electron transport chain 3. How many molecules of carbon dioxide (CO2) would be produced by five turns of the citric acid cycle? a. 2 b. 5 c. 10 d. 12 e. 60 4. The primary role of oxygen in cellular respiration is to a. yield energy in the form of ATP as it is passed down the respiratory chain. b. act as an acceptor for electrons and hydrogen, forming water. c. combine with carbon, forming CO2. d. combine with lactate, forming pyruvate. e. catalyze the reactions of glycolysis. 5. During aerobic cellular respiration, a proton gradient in mitochondria is generated by ____ and used primarily for ____. a. the electron transport chain; ATP synthesis b. the electron transport chain; substrate-level phosphorylation c. glycolysis; production of H2O d. fermentation; NAD+ reduction e. diffusion of protons; ATP synthesis 6. Organisms that can exist with light as an energy source and an inorganic form of carbon and other raw materials a. are called photoautotrophs. b. do not exist in nature. c. are called heterotrophs. d. are best classified as decomposers. e. both C and D 7. What is the primary function of the light reactions of photosynthesis? a. to produce energy-rich glucose from carbon dioxide and water b. to produce ATP and NADPH c. to produce NADPH used in respiration d. to convert light energy to the chemical energy of PGAL e. to use ATP to make glucose 8. Which of the following statements best describes the relationship between photosynthesis and respiration? a. Respiration is the reversal of the biochemical pathways of photosynthesis. b. Photosynthesis stores energy in complex organic molecules, while respiration releases it. c. Photosynthesis occurs only in plants and respiration occurs only in animals. d. ATP molecules are produced in photosynthesis and used up in respiration. e. Respiration is anabolic and photosynthesis is catabolic. 9. CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they a. fix CO2 into organic acids during the night. b. fix CO2 into sugars in the bundle-sheath cells. c. fix CO2 into pyruvate in the mesophyll cells. d. use the enzyme phosphofructokinase, which outcompetes rubisco for CO2. e. use photosystems I and II at night 10. Where is ATP synthase located in the mitochondrion? a. cytosol b. electron transport chain c. outer membrane d. inner membrane e. mitochondrial matrix 11. The direct energy source that drives ATP synthesis during respiratory oxidative phosphorylation is a. oxidation of glucose to CO2 and water. b. the thermodynamically favorable flow of electrons from NADH to the mitochondrial electron transport carriers. c. the final transfer of electrons to oxygen. d. the difference in H+ concentrations on opposite sides of the inner mitochondrial membrane. e. the thermodynamically favorable transfer of phosphate from glycolysis and the citric acid cycle intermediate molecules of ADP. 12. If oxygen is not present in sufficient quantity, pyruvate molecules are converted into a. ethanol or lactic acid b. amino acids or fatty acids c. carbon dioxide and water d. carbon dioxide or oxygen e. acetyl-CoA and citric acid 13. The terminal electron acceptor in mitochondrial respiration is a. hydrogen b. NADH c. pyruvate d. oxygen e. carbon dioxide 14. Which of the following represents a plausible pathway of electrons through the process of cellular respiration? a. Glucose␣Pyruvate␣Acetyl-CoA␣FADH2␣oxygen b. Glucose␣NADH␣electron transport chain␣Acetyl-CoA␣oxygen c. Glucose␣Pyruvate␣electron transport chain␣NADH␣Acetyl-CoA d. Glucose␣NADH␣Acetyl-CoA␣electron transport chain␣carbon dioxide e. Glucose␣carbon dioxide␣FADH2␣electron transport chain␣Acetyl-CoA