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
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?

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

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