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<p>(<a href="page.php?w=substrate-level_phosphorylation">substrate-level phosphorylation</a>) do not refer to primary nutritional groups, but simply reflect the different use of possible electron acceptors in particular organisms, such as  in aerobic respiration, <a href="page.php?w=nitrate">nitrate</a>  or <a href="page.php?w=sulfate">sulfate</a>  in anaerobic respiration, or various metabolic intermediates in fermentation.</p>

<p><big>Primary sources of energy</big></p>
<p><a href="page.php?w=Phototroph">Phototroph</a>s absorb light in <a href="page.php?w=photosynthetic_pigment">photoreceptors</a></p><p>
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