Characterisation of the Complete Three-Dimensional Structure of a Newly Purified

question 31

Multiple Choice

Characterisation of the complete three-dimensional structure of a newly purified protein suggests that it catalyses the breakdown of a large substrate. The protein consists of a single polypeptide chain. It has a large pocket that appears to be the binding site for the substrate and a smaller indentation that appears to be the binding site for a regulatory molecule. What do these structural observations suggest about the mechanism by which the activity of this protein is likely regulated?

• A) It is probably an enzyme that is regulated by noncompetitive inhibition.
• B) It is probably a multi-subunit enzyme that is regulated by allosteric regulation.
• C) It is probably an enzyme that is regulated by competitive inhibition.
• D) It is probably an enzyme that is regulated by cooperativity.

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Definitions:

Moderate Risk

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Herpes Simplex Virus

A virus that causes contagious sores, most often around the mouth or on the genitals.

Epidemiological Study

Research aimed at investigating the patterns, causes, and effects of health and disease conditions in defined populations.