47. The reactions of the Calvin are not directly dependent on light, but they usually do not occur at night. Why? It is often too cold at night for these reactions to take place. Carbon dioxide concentrations decrease at night. The Calvin cycle requires products only produced when the photosystems are illuminated. Plants usually open their stomata at night. At night, no water is available for the Calvin cycle. 48. What is the role of NADP+ in photosynthesis? It assists chlorophyll in capturing light. It acts as the primary electron acceptor for the photosystems. As part of the electron transport chain, it manufactures ATP. As a component of photosystem II, it catalyzes the hydrolysis of water. It is reduced and then carries electrons to the Calvin cycle. 49. Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements is most true about this compound? It is produced from glucose during glycolysis. It is a 3-carbon sugar. For every three molecules of CO2, six molecules of G3P are formed but only one molecule exits the cycle to be used by the plant cell. For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP All of the listed responses are correct. 50. You have a large, healthy philodendron that you carelessly leave in total darkness while you are away on vacation. You are surprised to find that it is still alive when you return. What has the plant been using for an energy source while in the dark? Even though it can't out the light reactions, the plant can still produce sugars because the Calvin cycle doesn't require light. During the time it did have access to light, the plant stored energy in the form of sugars or starch, and it was able to derive energy from the stored molecules during your vacation. Even though the plant received no visible light, it was able to use the part of the electromagnetic spectrum (gamma rays and X-rays) to carry out photosynthesis. When light energy is not available, plants can derive energy from inorganic molecules. None of the listed responses is correct.
47. The reactions of the Calvin are not directly dependent on light, but they usually do not occur at night. Why? It is often too cold at night for these reactions to take place. Carbon dioxide concentrations decrease at night. The Calvin cycle requires products only produced when the photosystems are illuminated. Plants usually open their stomata at night. At night, no water is available for the Calvin cycle. 48. What is the role of NADP+ in photosynthesis? It assists chlorophyll in capturing light. It acts as the primary electron acceptor for the photosystems. As part of the electron transport chain, it manufactures ATP. As a component of photosystem II, it catalyzes the hydrolysis of water. It is reduced and then carries electrons to the Calvin cycle. 49. Glyceraldehyde-3-phosphate (G3P) is produced in the stroma of chloroplasts. Which of the following statements is most true about this compound? It is produced from glucose during glycolysis. It is a 3-carbon sugar. For every three molecules of CO2, six molecules of G3P are formed but only one molecule exits the cycle to be used by the plant cell. For every three molecules of CO2, six molecules of G3P are formed but five molecules must be recycled to regenerate three molecules of RuBP All of the listed responses are correct. 50. You have a large, healthy philodendron that you carelessly leave in total darkness while you are away on vacation. You are surprised to find that it is still alive when you return. What has the plant been using for an energy source while in the dark? Even though it can't out the light reactions, the plant can still produce sugars because the Calvin cycle doesn't require light. During the time it did have access to light, the plant stored energy in the form of sugars or starch, and it was able to derive energy from the stored molecules during your vacation. Even though the plant received no visible light, it was able to use the part of the electromagnetic spectrum (gamma rays and X-rays) to carry out photosynthesis. When light energy is not available, plants can derive energy from inorganic molecules. None of the listed responses is correct.
Mock_Exam_2_-_Key_.docx