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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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?

All of these
Competitive inhibitors are blocking the reaction from occurring in the active site
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

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