Enzyme Reaction
An enzyme that is always produced, regardless of the presence of substrates or the end products, is called

a constitutive enzyme
a repressible enzyme
an allosteric enzyme
an isoenzyme

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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 determine the direction of a reaction
Enzymes are found in living organisms and speed up certain reactions
Enzymes speed up reactions by definite amounts

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