Find out the correct sequence for movement of electrons during the light-dependent reaction:
Correct answer: D. Water, p680, p700, NADP
- A. p680,p700, water, NADP
- B. Water, p700, NADP, p68
- C. p700, p680, NADP, water
- D. Water, p680, p700, NADP
Explanation
In the presence of light the photolysis of water occurs in the water splitting centre within photosystem II, the electrons released are used to replace the ones lost by photosystem II in non-cyclic photophosphorylation.The first system in the chain is photosystem II, whose primary pigment can absorb at an optimal wavelength of 680mm hence it is termed as P680. Excitation of electrons occurs causing the electrons to move down the chain to photosystem I also known as P700, as its primary pigments absorb at an optimum wavelength of 700mm.
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About Bioenergetics
Cellular respiration explains how cells release energy from glucose through glycolysis, the link reaction, Krebs cycle and electron transport chain. It includes ATP production, substrate-level and oxidative phosphorylation, aerobic versus anaerobic respiration, and the roles of mitochondria, oxygen and fermentation in energy transfer.
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