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Lecture 19

BIOL 1000 Lecture 19: Lecture 19

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University of Manitoba
Biological Sciences
BIOL 1000
Kevin G.Scott

o78P   Other 66% generates heat (you get warm after exercise) Chemical reactions either release or store energy Chemical reactions either release energy or they require an input of energy & store energy Exergonic reaction = chemical reaction that RELEASES energy Begins with reactants whose covalent bonds contain more energy than those in the products Burning of wood (containing cellulose – energy-rich carbohydrate) releases energy of glucose as heat and light, carbon dioxide and water are the products of the reaction Cells release energy from fuel molecules during cellular respiration Both burning and cellular respiration are exergonic Burning only involves one step, cellular respiration involves many Some energy of cellular respiration is released as heat, rest converted to chemical energy as ATP (cells use ATP as immediate source of energy) Endergonic reactions = require a net input of energy, yields products that are rich in potential  energy Starts out with reactant molecules that contain little amounts of potential energy Energy is absorbed from surrounding as reaction occurs Products contain more chemical energy than reactants did E.g. photosynthesis  Starts with energy-poor reactants (carbon dioxide and water)   Uses energy absorbed from sunlight   Pro
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