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

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

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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 are found in living organisms and speed up certain reactions
Enzymes speed up reactions by definite amounts

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Enzyme Reaction
Hydrogen and oxygen release enormous amounts of energy when they react. Yet, hydrogen and oxygen can be mixed together in a balloon and nothing will happen. Why?

The energy of activation to form the transition-state complex is too high to allow the reaction to occur without assistance
There must be contaminating elements in the balloon that prohibit the reaction from occurring
All of these
Competitive inhibitors are blocking the reaction from occurring in the active site

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