Enzyme Reaction
Anthranilate synthase, the first enzyme of tryptophan biosynthesis after the branch point shows feedback inhibition and repression due to

L-serine
D-L-tryptophan hydantoin
pyruvate
L-tryptophan

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Enzyme Reaction
Which of the following is the best evidence for the lock and key theory of enzyme action?

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

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