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Key_Exam2_lstpg - ethanol(An Example – 2 pts 4 A leaf is...

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Name ___KEY___________________________ ID _____________________________ Short Answer (22 points). Exam 2, Bis2A / Gerhart / Spring 2010 A. internal electron acceptor (e.g., NAD+, NADP+) B. electron transport chain C. ATPase D. Oxidation of a fuel (e.g., Glycolysis) E. Oxidation of an external donor molecule F. Reduction of an external acceptor molecule G. Photo-reactive pigment (e.g., chlorophyll) H. Proton motive force I. Carbon fixation J. Substrate-linked phosphorylation (producing ATP) 1. Categorize the above, according to whether each is involved in respiration, photosynthesis, or both. (10 pts) (+ 1 for each correct) 2. Which of the processes listed above occur in a cell performing fermentation? (3 -- +1 pt for each correct response, -0.5 for each incorrect) A, D, J 3. What additional step, not listed above, must also occur in the fermenting cell? Provide an example illustrating this step. (4) Recycling of NADH to NAD+ (1) by reducing an internal acceptor molecule (1) . Examples include the reduction of pyruvate to lactic acid, and of acetate (derived from pyruvate) to
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Unformatted text preview: ethanol. (An Example – 2 pts) 4. A leaf is coated with Vaseline, so that no gasses from the atmosphere can enter the leaf. Which process of photosynthesis would be most affected (circle one): cyclic PS, noncyclic PS, the light-independent reactions . (1 pt) 5. WHY? Justify and explain your answer. (4 pts). The light-independent reaction, or Calvin cycle, requires carbon dioxide , which enters leaves from the atmosphere (1 pt). The carbon dioxide is fixed to an organic molecule then reduced to form sugar , using energy from the light reactions (1 pt). Neither cyclic PS (1 pt) nor noncyclic PS (1 pt) requires carbon dioxide or any other gas . Each requires only photons of light from the exterior of the cell; all else necessary for these pathways (pigments, ETC, ATPase, NAD+ reductase) are found within the cell. Respiration only D, F, J Photosynthesis only E, G, I Both A, B, C, H...
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