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Transcript
IB Biology Year 1 / IHS KEY - Photosynthesis Workshop: Putting it All Together Table 1. Summary of each stage of photosynthesis One run of light rxns with linear eflow 3 turns of the Calvin Cycle 1. Is light absorbed? Occur in the dark? Location in plant cell # of H2O used # of O2 produced # of ATP made # of NADP reduced # of CO2 used # of H2O made # of ATP used # of NADPH oxidized Yes No 1 ½ 1 1 --- --- --- --- No No!! On thylakoid membrane of chloroplast In stroma of chloroplast --- --- --- --- 3 3 9 6 How many NADPH are required to produce one net molecule of triose phosphate? 6 NADPH per triose phosphate 2. How many Calvin Cycles are required to form one glucose molecule (C6H12O6)? 6 Calvin Cycles per glucose, since it takes two triose phosphates (each of consists of 3 carbons) to make one six-carbon glucose. which 3. Judging from # 1 & 2 and Table 1 above, how many light-dependent reactions are required to form one glucose with linear e- flow? 12 light reactions if are operating with linear e- flow. all of them 4. How many ATP are required to produce one net triose phosphate molecule? 9 ATPs per triose phosphate One glucose? 18 ATPs per glucose 5. Given your answers to #3 & 4, how are the rest of the ATP produced? The rest (18 – 12, or 6 more ATP needed) must be coming from cyclic e- flow. 6. State at two different “fates” of the glucose made by photosynthesis. Glucose can be respired in leaf cells’ mitochondria to generate ATP Glucose can be used as a building block in polymers like cellulose or starch Glucose can be used to make sucrose, which is the “traveling” form of sugar in a plant, and sent to feed the roots, which don’t do photosynthesis Glucose can be used to make ALL the biomolecules plant cells need: amino acids (also requires N), fatty acids, nucleotides (also requires N), etc. 7. Write the complete summary equation for photosynthesis: 12 H2O + 6 CO2 + light energy 6H2O + 6 O2 + C6H12O6 OR 6 H2O + 6 CO2 + light energy 6 O2 + C6H12O6