Enzyme Reaction
About 7.3 kcal/mole are released when

glucose is converted to CO2 and H2O
the terminal phosphate bond of ATP is broken by hydrolysis
ATP hydrolysis is coupled to sucrose synthesis
NAD+ is reduced to NADH

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Enzyme Reaction
Which of the following is the best evidence for the lock and key theory of enzyme action?

Enzymes are found in living organisms and speed up certain reactions
Enzymes determine the direction of a reaction
Compounds similar in structure to the substrate inhibit enzyme activity
Enzymes speed up reactions by definite amounts

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