BIOL 108 Lecture Notes - Lecture 5: Endergonic Reaction, Anabolism, Starch
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Metabolism: all of a (cid:272)ell"s (cid:894)or a(cid:374) orga(cid:374)is(cid:373)"s(cid:895) (cid:271)io(cid:272)he(cid:373)i(cid:272)al a(cid:374)d physiologi(cid:272)al pro(cid:272)esses. All components of metabolism are classed as either: Anabolism (building things up): builds larger, more complex molecules or structures from smaller, simpler things, uses energy (must be driven by an energy source), examples: Catabolism (the opposite, breaking down): breaks larger, more complex things down into smaller, simpler things, releases energy. While physiologists speak of anabolic vs. catabolic processes, chemists classify chemical reactions as the following: Endergonic ((cid:862)energy in(cid:863): reactants have less energy than the products. They must be driven by an energy supply: a physical analogy is: rolling a ball uphill, these are the reactions of anabolism (see above), some biochemical examples: Exergonic ((cid:862)energy out(cid:863): reactants have more energy than the products. So exergonic reactions release energy. (they supply the energy needed for endergonic reactions. : a physical analogy: rolling a ball downhill, these are the reactions of catabolism (see above), some biochemical examples:
