Question

que photosynthetic pigment instead of chlorophyll. The leaves of this plant always appear to be green. What colors of light would be least effective for photosynthesis for this plant? A plant has a unique photo yellow, not green. What co A. green B. white C. red D. blue E yellow 25. Which of the following is NOT a product of the light reactions? A. NADPH В. АТР C. oxygen D. carbon dioxide 26. Which of the following are products of the Calvin cycle? A. glyceraldehyde-3-phosphate (G3P) B. NADP+ C. ADP D. A and B only E/A, B, and C are correct 27. The function of the light-harvesting (antenna) complex of a photosystem is A Transfer electrons from water to the reaction center. B. Create an H gradient for the production of ATP. C. Pump hydrogen ions against their gradient using light energy D. Transfer electrons to the electron transport chain. E Collect and pass light energy to excite electrons in the reaction center 28. Which of the following best represents the path of noncyclic electron flow that occurs during photosynthesis? A HO->PS II P680 → Primary Electron Acceptor PS I P700 NADPH Electron transport chain B. H. O PS II P680 Primary Electron Acceptor Electron transport chain →PS I P700 NADPH C/ PS II P680 H0 Primary Electron Acceptor-PS I P700 NADPH Electron transport chain D. PS II P680 → Primary Electron AcceptorH:0-Electron transport chain-PSI P700 NADPH E. PS II P680-NADPH → Electron transport chain Primary Electron Acceptor-HOPS IP700 29. How would a drug that inhibits the Calvin Cycle affect the light reactions? A. The light reactions would stop when they ran out of G3P B. The light reactions would increase due to a buildup of ATP and NADPH C. The light reactions would stop when they ran out of NADP and ADP D. The light reactions would increase due to extra CO2- E. the light reactions would not be affected by the drug. 30. After the sun goes down (night time), C3 plants (regular plants, not CAM plants) A. continue the light reactions, Calvin Cycle, and cellular respiration B/ stop the light reactions, continue the Calvin Cycle and cellular respiration C. stop the light reactions, stop the Calvin Cycle, but continue cellular respiration D. stop the light reactions, stop the Calvin Cycle, and stop cellular respiration E. stop the light reactions, stop the Calvin Cycle, and go into fermentation instead of cellular respiration 31. How many energy intermediates must be used in the Calvin Cycle in order to produce one molecule of glucose? A. 2 NADPH, 3 ATP B. 12 NADPH, 1 ATP C. 18 NADH, 12 ATP D 12 NADPH, 18 ATP

Answer 1

Question 24

Answer: Plant leaves that has more xanthophyll pigments and appears yellow because they reflect the yellow light and will not absorb the yellow light. As this pigment will not absorb yellow light, yellow light would be least effective for photosynthesis. Hence, option E is correct and the others are incorrect.

Question 25

Answer: In photosynthesis, light reaction is the first step that converts solar energy (Sun light) in to chemical energy (ATP and NADPH). ATP and NADPH is used in Calvin cycle to produce sugars. During light reaction, water is photo lysed and oxygen is released. Carbon dioxide is used in dark reactions but not in light reaction. Hence, Option A, B, C are the products of light reaction and carbon dioxide is not a product of light reaction. So, option D is the correct answer.

Question 26

Answer: In photosynthesis, dark reaction or Calvin cycle is the second step that involves conversion of carbon dioxide into glucose. In the first step of dark reaction, carbon dioxide is fixed and is incorporated into glyceraldehyde-3-phosphate using ATP and NADH forming ADP and NADP. So, the products of Calvin cycle includes glyceraldehyde-3-phosphate, ADP and NADP. So, the correct answer is option E.

Question 29

Answer: Light harvesting complex of photosystem is a complex that contain proteins and chlorophyll molecules embedded in the thylakoids. It absorbs the light energy from sun light and transfers it to excite the electrons in the reaction center. It does not transfer the electrons from water. Hence, option E is the correct answer and option A is incorrect. Electron transport chain complexes create H+ gradient for the production fo ATP. ATP synthase pumps hydrogen against the concentration gradient. NADH and FADH2 transports electrons to electron transport chain. Hence, option B, C and D are incorrect.