C3, C4, and CAM Photosynthesis Flashcards | Quizlet
C4 plants are more efficient at photosynthesis than C3: ..
In selecting this paper for the fourth RFFBR Paper Award, the Board of directors of the Rebeiz Foundation felt that the described work will greatly benefit other chloroplast researchers, and enhance our knowledge of the relationship of photosynthesis to other metabolic processes in the plant cell.
Photosynthesis and the C3/C4 Plant ..
Phosphoenolpyruvate is regenerated from pyruvate at the expense of 2 ATP per molecule. This is in addition to the ATP used by the Calvin cycle and is an energetic cost of C4 photosynthesis. This cost can be seen by measuring the number of absorbed photons required by C3 and C4 plants in the laboratory under conditions of elevated CO 2, where oxygenation does not occur.
Crassulacean acid metabolism - Wikipedia
In a C3 plant where the first product of photosynthesis is a molecule with three Carbon (C) atoms, RuBisCo acts alone.Slightly up the evolutionary ladder are plants where the first product of the photosynthetic process is a molecule with four C atoms and where RuBisCo does not act alone.
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Cross section C4 leaf.
Whereas the RuBisCo in the C3 plant fixes the CO (rather poorly) and prepares for the photosynthesis process in all the chloroplasts in all the mesophyll cells, the C4 plant has a more efficient way of fixing the CO.It has a much more efficient enzyme called PEP which compared to RuBisCo has a much greater affinity with CO.
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The CO is then fixed by the RuBisCo in the bundle sheath cells, and photosynthesis occurs with its resultant sugar via the C3 pathway and the Calvin cycle.The direct C4 pathway...
CO + PEP --> oxaloacetic acid --> malic acid --> to bundle sheath cellsThen in bundle sheath cells, in the presence of RuBisCo, using the Calvin cycle...
CO + PEP --> photosynthesis --> SugarThe combined efficiency of PEP in fixing CO, together with the tightly packed double ring of bundle sheath cells and mesophyll cells (called Kranz anatomy.....