Enzyme Reaction
About 7.3 kcal/mole are released when

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

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

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

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