[Campbell Biology P.209] According to the text and Figure 8.20b, which statement best descri... | Practice Question
According to the text and Figure 8.20b, which statement best describes the mechanism of cooperativity in a multisubunit enzyme?
A: It involves the binding of an activator molecule to a regulatory site, stabilizing the active form.
B: Binding of an inhibitor to one subunit locks all subunits in an inactive conformation.
C: The binding of a substrate molecule to one active site induces a conformational change that increases the catalytic activity of other active sites within the same enzyme.
D: It describes how hemoglobin, an enzyme, binds oxygen more readily after the first oxygen molecule binds.
Explanation
The text states that cooperativity is 'another kind of allosteric activation, a substrate molecule binding to one active site in a multisubunit enzyme triggers a shape change in all the subunits, thereby increasing catalytic activity at the other active sites Figure 8.20b .'