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Unformatted text preview: difference in the concentration of charged ions on the inside compared to the outside of the cell. Which ion largely accounts for this membrane potential? H+ (or hydrogen ions or protons) 3 pts 4. Phytochromes are photoreversible plant pigments that exist in two different conformations, Pr and Pfr. What converts the Pr conformation to the Pfr conformation and vice versa (Pfr to Pr)? Red light converts Pr to Pfr and far-red (or infrared) light converts Pfr to Pr...
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- Spring '08