BIOS 2011 Lab 2 Photosynthesis

H protons are transported with the electrons from

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Unformatted text preview: ­reduction reactions mediated by the cytochromes (iron ­containing hemoproteins) until it is eventually accepted by NADP+, reducing it to NADPH. ATP Production When the thylakoid membrane is illuminated, the electron transport system begins to function. Water is split and NADPH is produced. It is very important to realize where these events take place. Water is split at the inner side of the thylakoid membrane, releasing protons into the thylakoid space. Excited electrons travel first to the primary electron acceptors on the stromal side of the membrane, and are then transported back to the P ­700 photosystem center on the inside of the thylakoid. H+ protons are transported with the electrons from the stroma into the thylakoid space. These and other events lead to the establishment of a proton gradient across the membrane. In fact, in high intensities of light, the pH insi...
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