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Chapter 19: Q19_2P (page 662)
Green sulfur bacteria use H2S as an electron donor for photosynthesis. Write an equation that describes photosynthesis in these organisms
The equation for photosynthesis in green sulfur bacteria is:
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H218O is added to a suspension of chloroplasts capable of photosynthesis. Where does the label appear when the suspension is exposed to sunlight?
Describe the events that occur after the special pair of PbRC absorbs a photon.
Why do photosynthetic organisms contain several types of pigment molecules?
In an effort to increase the efficiency of photosynthesis in crop plants, researchers have genetically engineered tobacco plants (a model organism) to express cyanobacterial carboxylase, which has lower oxygenase activity. However, tobacco plant growth was not enhanced unless the plants were also engineered to express the cyanobacterial genes for bicarbonate transporters. Explain this observation.
Under conditions of very high light intensity, excess absorbed solar energy is dissipated by the action of photoprotective proteins in the thylakoid membrane. Explain why it is advantageous for these proteins to be activated by build up of the proton gradient across the membrane.
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