Enzyme Reaction
The affinity of an enzyme for its substrate, when the enzyme has a Km of 0.50 M will be __________ than the affinity of an enzyme for its substrate when the enzyme has a Km of 0.05 M.

greater
half
approximately equal
lesser

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

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

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