Photosynthesis160-page17

Photosynthesis160-page17 - 2 O 2 and the C 4 Pathway How...

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Photosynthesis - 17 Synthesis of Other Organic Molecules Although glucose is the typical end product of photosynthesis, plants do not store or transport glucose. Sucrose (synthesized from fructose-phosphate and glucose- phosphate) is the typical solute translocated throughout the plant, and, as learned, plants typically store starch, including within the chloroplasts. In addition, plants are capable of synthesizing all of their organic molecules (amino acids, lipids, etc.) from photosynthetic intermediates, notably G3P and glucose phosphate. It's important to understand the covalent bonds of the carbohydrate molecules synthesized in the Calvin cycle represent the light energy captured to provide the energy needs for all life! Photorespiration – Water, CO
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Unformatted text preview: 2 , O 2 and the C 4 Pathway How much photosynthesis takes place depends in part on climate. If it is too hot or too dry, loss of water through stomata may be too great for the plant, and stomata will close. CO 2 gas is no longer available for photosynthesis. The ratio of oxygen to carbon dioxide in the leaf increases, and this favors a process called photorespiration. Rubisco, the enzyme that brings CO 2 and RuBP together, works only when the concentration of CO 2 is high relative to the level of O 2 . When CO 2 levels drop, the enzyme, Rubisco, combines RuBP with O 2 and the Calvin cycle is disrupted. Photorespiration decreases the photosynthetic output of the plant. Photorespiration in a C 3 plant...
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