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Lecture 6 Questions KEY - and one non-usable product(note...

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Lecture 6: 1) If the algae in Calvin’s 14 CO 2 experiments had been C 4 plants, then 14 C would first appear in what molecule? Draw this structure Oxaloacetate 2) The primary carbohydrate exported from the chloroplast is Glyceraldehyde-3- Phosphate . Draw this structure. 3) Write both reactions catalyzed by Rubisco (use structures) See Lecture 6, you need to show the Carboxylase reaction and the Oxygenase reaction 4) Explain the process that causes plants to waste up to 1/3 of the carbon dioxide that they fix. The process is photorespiration. It is a waste because the plant spent all that time and energy building the ribulose-1,5-bisphosphate only to break it into one usable product
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Unformatted text preview: and one non-usable product (note the exceptions outlined in the lecture). 5) What is the role of plasmodesmata and where is it located? The plasmodesmata is utilized as a means to concentrate carbon dioxide in the relevant cellular compartment (bundle-sheath cell) and thus avoid the wasteful photorespiration process. Plasmodesmata are located between mesophyll cells and bundle-sheath cells. 6) List three ways in which enzymes of the Calvin cycle are regulated. Reduction in light pH and [Mg2+] Carbamoylation of Rubisco...
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