An Enzyme Is Composed of Four Identical Subunits

question 45

Multiple Choice

An enzyme is composed of four identical subunits. Binding of substrate to one subunit stimulates more rapid binding of substrate to each of the other three subunits. This enzyme is most likely regulated by which of the following mechanisms?

• A) noncompetitive inhibition
• B) competitive activation
• C) competitive inhibition
• D) cooperativity

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