1) Covalent catalysis is used by many enzymes to cleave peptide bonds. Which of

Question

1)

Covalent catalysis is used by many enzymes to cleave peptide bonds. Which of the following amino acids would not facilitate this type of catalysis? (Think of the structure of the R-group of these amino acids)

histidine

valine

methionine

tyrosine

2)

Enzymes reduce the activation energy for a reaction. All enzymes do this by:

providing an active site complementary to the substrate

providing an active site most complementary the transition state

providing energy to the reaction by the cleavage of ATP

providing an environment free of water

3)

All of the following are considered coenzymes except:

Thiamine pyrophosphate

pyridoxal phosphate

Heme

Biotin

4)

In a repressible operon, when the co-repressor is present:

the co-repressor binds the operator and inhibits transcription

the co-repressor binds the operator and activates transcription

the co-repressor binds the repressor and activates transcription

the co-repressor binds the repressor and inhibits transcription

histidine

valine

methionine

tyrosine

Explanation / Answer

1)b

2)a

3) C

4) C

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