| Term | Definition |
|---|
| Rubisco | Ribulose biphosphate carboxylase, the enzyme that catalyzes the first step of the Calvin Cyle |
| Photorespiration | A metabolic pathway that consumes oxygen an ATP, releases carbon dioxide and decreases photosynthetic output. Generally occurs on hot , dry, bright days when stomata close and the oxygen concentration in the leaf exceeds that of carbon dioxide |
| Ramifications of Photorespiraton | Photorespiration is a metabolic relic from a much earlier time hen the atmosphere had less O2 and more CO2 than it does today. In the ancient atmosphere that prevailed when rubisco first envolved, the inablity of enzymes active site to exclude O2 would have made little difference, thus the hypothesis suggest that modern rubisco retains some of its chance affinity for O2, which is now so connected in the atmosphere that a certain amount of photorespiration is inevitable. Protective Role in plants |
| How CO2 is deliver from the atomosphere | 1. In mesophyll cells, the enzyme PEP carboxylase adds carbon dioxide to PEP 2. A four carbon compound conveys the atoms of the CO2 into a bundle- sheath cell via plasmodesmata 3. In bundle-sheath cells, CO2 is released and enters the Calvin Cycle |
| Carbon Fixation in C4 Plants | CO2 + Phosphoenlopyruvic acid(PEP) = 4 C Oxaloacetic Acid |
| Carbon Fixation in CAM Plants | CO2 + PEP= 4 Carbon Malic Acid |
| What happens to glucose that is produced during photosynthesis... | 50% of the organic material made by photosynthesis is consumed as fuel for cellular respiration in the mitochondria of plant cells. Sometimes there is a loss of photosynthetic products to photorespiration. ***Multitude of ananbolic pathways that synthesize proteins, lipids, and other products. |
| C3 Carbon Fixation | 6 CO2 + 6 RuBP → 12 3-phosphoglycerate |
| fluorescence | is a luminescence that is mostly found as an optical phenomenon in cold bodies, in which the molecular absorption of a photon triggers the emission of a photon with a longer (less energetic) wavelength. |
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