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:

Amortized Loan

A loan with scheduled periodic payments that consist of both principal and interest, typically paid monthly, until the loan is fully repaid at the end of its term.

Principle

Principle refers to the original sum of money borrowed in a loan or the initial amount of investment before earnings or losses.

Interest Amount

the sum paid or charged for the use of money or for borrowing money.

Periodic Interest Rate

The interest rate charged or earned over a particular period of time, often expressed as a percentage.