PHOTOSYNTHESIS
LIGHT DEPENDENT REACTIONS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Test for the presence of sugar
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Test for the presence of oxygen in light
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Test for thylakoid presence in the chloroplasts
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Detailed explanation-1: -How could the scientist determine if PSII is missing from the plant’s chloroplasts? Test for the presence of oxygen in the light. Oxygen is released in PS II, so if PS II is missing from the chloroplasts, no oxygen would be found.
Detailed explanation-2: -But Owens and researchers from the Oak Ridge National Laboratory in Tennessee found that in some cases photosynthesis can occur in the absence of PSI, they report in the journal Science (July 19, 1996).
Detailed explanation-3: -Light that is harvested from PSII causes an excited electron of the chlorophyll a special pair to be passed down an electron transport chain (Pq, Cyt, and Pc) to PSI. The electron lost from the chlorophyll a special pair is replenished by splitting water.
Detailed explanation-4: -Photosystem II (PSII) is a membrane protein supercomplex that executes the initial reaction of photosynthesis in higher plants, algae, and cyanobacteria. It captures the light from the sun to catalyze a transmembrane charge separation.
Detailed explanation-5: -The energized electrons are replaced by oxidizing water to form hydrogen ions and molecular oxygen.