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10 Cards in this Set
- Front
- Back
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What is the importance of coupled reactions?
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Coupled reactions allow an exergonic reaction to drive an endergonic reaction
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Biological catalysts _____.
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are organic substances that lower the activation energy required to initiate a reaction that would normally take place at a slower rate
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ATP is well suited to its role as an energy-carrier molecule in cells because _____.
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the covalent bond between the last two phosphates can be broken to release substantial amounts of energy
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Pepsin is an enzyme that breaks down protein but will not act upon starch. This fact is an indication that enzymes are _____.
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specific
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A substance that is acted upon by an enzyme to produce a product is called a(n) _____.
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substrate
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Potential energy represents _____.
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stored energy
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Why do most reactions occur more rapidly at high temperature
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A. Molecules move more rapidly at higher temperatures.
B. Collisions between molecules are more frequent. C. Collisions will be hard enough to force electron shells to interact. |
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Electron carrier molecules that transport energy include _____.
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both NAD+ and FAD
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The amino acid threonine is converted to isoleucine by a sequence of five enzymatic reactions. When isoleucine levels are high, the first reaction in this sequence is turned off. This is an example of _____.
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feedback inhibition
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Lysosomes have an acidic interior (pH = 5), unlike the rest of the cell (pH = 7). Lysosomal enzymes are most active at _____
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pH = 5
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