Enzyme Reaction
The ability of CTP to bind to aspartate carbamoyltransferase and shut down the synthesis of more CTP is an example of

enzyme induction
none of these
enzyme repression
feedback inhibition of enzyme activity

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

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