Lecture 5 Questions KEY - Lecture 5 1 Draw the Z-Scheme...

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Lecture 5: 1) Draw the Z-Scheme with the following components: Water, O2, Mn Center, P680, plastocyanin, Pheophytin, Plastoquinone, Cytb6f, P700, Chl, Phyloquinone, Fe-S centers, NADP, NADPH, and Ferredoxin (THESE ARE NOT IN ANY PARTICULAR ORDER) See lecture notes… 2) Photosystem I is the site of oxygen evolution? True/ False 3) Non-cyclic e- transport generates a(n)... electrochemical potential gradient OR pH gradient 4) Explain why light with a wavelength > 680 fails to evolve oxygen PSII is the site of oxygen evolution and absorbs light at wavelengths less than or equal to 680nm (within a narrow limit). Consequently, if one uses light > 680nm only PSI will work effectively and the oxygen producing PSII is bypassed. 5) Why does adding a background of green light combined with higher wavelength light (> 680nm) result in oxygen evolution? The green light is able to stimulate both PSII and PSI. Consequently, as the far-red light oxidizes plastocyanin, the green light serves to reduce plastocyanin (through the intermediates Phe, PQ, Cyt b6f). Consequently, the combination of green light and far-red light allows for the two
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