BIO 202 Lecture 8

BIO 202 Lecture 8 - Energy in Biology, ATP Many enzymes...

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Energy in Biology, ATP
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Many enzymes require energy to perform their functions • Why do they need energy? • Where does it come from? • How is it stored?
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But, living organisms increase order. How do they do it? Cells release heat (They are not an isolated system) Less order inside (Colder outside) More order inside (Warmer outside) 2 nd Law of thermodynamics I n an isolated system, the degree of disorder can only increase
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Cells lose heat, therefore they require an energy input Sun Plants FOOD Energy comes from the sun and is stored in chemical bonds
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Energy is stored in ATP molecules ATP is a nucleoside triphosphate •It can function as one of the four nucleotides in RNA •It is used in many signaling pahtways •The gamma (i.e. the third) phosphate is often attached to protein in order to facilitate a conformational change , which alters the activation state. •It provides the necessary energy for a range of enzymatic reactions which would otherwise be energetically unfavorable. •The hydrolysis of the gamma phosphate
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BIO 202 Lecture 8 - Energy in Biology, ATP Many enzymes...

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