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Unformatted text preview: Name _________________________ TA ________________________ MCDB 1B Final Examination March 19, 2008 Scantron Instructions: 1. Use a #2 pencil to complete the form. 2. Write your name and fill in the appropriate bubbles. 3. Write your perm. number in the ID number box and fill in the bubbles. 4. Write the color of your test in the space underneath the ID number box. 5. Fill in the entire rectangle of the answer you choose. If you erase, erase completely READ ALL QUESTIONS THOROUGHLY----IN ALL CASES, PICK THE BEST ANSWER 43 MULTIPLE CHOICE QUESTIONS - 2 POINTS EACH 14 TRUE FALSE QUESTIONS - 1 POINT EACH Reminder: The only way to make a challenging multiple choice exam is to have at least one wrong answer sound plausible: LOOK FOR FATAL FLAW(S) in each statement. The following multiple choice questions are worth 2 points each 1. In CAM metabolism A. carbon fixation by the Calvin cycle occurs at night to avoid photorespiration B. carbon is fixed via C4 metabolism at night and by the Calvin cycle in the day C. fixed carbon is stored in the vacuole in the form of crassulacean acid, a 4 carbon compound D. fixed carbon is shuttled from mesophyll to bundle sheath cells E. the problems of photorespiration are reduced by isolating the enzyme PEP carboxylase from high levels of dissolved O 2 2. In noncyclic photophosphorylation, electrons lost from photosystem I are replaced with electrons from ____________, and electrons lost from photosystem II are replaced with electrons from _____________ . A. photosystem II, water B. water, photosystem I C. photosystem II, NADPH + H + D. NADPH + H + , photosystem I E. ferredoxin, water 3. Electron transport systems in respiration and the light reactions of photosynthesis both A. use soluble enzymes to produce ATP B. provide reducing power in the form of NADPH C. require reducing power in the form of NADH D. pump H + across a membrane to generate a gradient whose potential energy drives ATP synthesis E. pump O 2 across a membrane to generate a gradient whose potential energy drives ATP synthesis MCDB 1B Final Exam, Blue (0) Version: 0 Page: 1 4. The reducing power needed in the Calvin cycle A. is supplied in the form of NADPH B. is produced by both cyclic and noncyclic photophosphorylation C. is used during the "sugar shuffle" that regenerates RuBP D. is used during the conversion of 3PG (phosphoglycerate) to G3P (glyceraldehyde 3- phosphate) E. A and D 5. The C4 pathway of carbon fixation A. occurs in bundle sheath cells of plants with "Kranz" anatomy B. occurs during the day in CAM plants C. reduces the problems of photorespiration by isolating the enzyme PEP carboxylase from high levels of dissolved O 2 D. reduces the problems of photorespiration by isolating the enzyme RuBP carboxylase from high levels of dissolved O 2 E. A and D 6. According to the "Z scheme" of photosynthesis A. regeneration of the P 700 in photosystem I occurs by cyclic photophosphorylation B. light energy is used to generate a HB....
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