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<p>electron transfer chain in turn drives the pumping of protons across the membrane.</p>

<p><big> Photoreceptor pigments </big></p>
<p>The pigments in <a href="page.php?w=photoreceptor_protein">photoreceptor protein</a>s either change their <a href="page.php?w=Conformational_isomerism">conformation</a> or undergo <a href="page.php?w=photoreduction">photoreduction</a> when they absorb a photon. This change in the conformation or <a href="page.php?w=redox">redox</a> state of the chromophore then affects the protein conformation or activity and triggers a</p><p>
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