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100cps7.s09 - Biochemistry Molecular Biology 100C Spring...

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Biochemistry & Molecular Biology 100C Spring, 2009 Problem Set #7 Due: June 5. 1. Most modern flowering plants are termed C 3 plants . (a) Why? (b) Out of more than 30,000 known flowering plants species, some 600 are termed “C 4 plants”. Wh at is the defining biochemical property of C 4 plants? (c) In leaf tissue of C 4 plants, two types of photosynthetic cells, mesophyll and bundle-sheath, are both physically and functionally distinct. How do the dark-reactions in mesophyll and bundle-sheath tissue differ? (d) How do the light-reactions in mesophyll and bundle-sheath tissue differ? (e) Moving to Pat and Vanna‟s game board of inductive reasoning: for C 4 photosynthesis, what is the point of this division of labor? (f) Compare photosynthetic strategies of C 3 and C 4 plants. In relative terms, how might C 4 plants be at a competitive advantage? (h) Why, then, do C 4 plants number less than 2% of all flowering plant species? 2. In C 4 plants, leaf mesophyll cells possess a pyruvate-phosphate dikinase (PPdK) activity: pyruvate + P i + ATP PEP + 5´AMP + PP i (a) Are you surprised by this observation? Why or why not? (b
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