Data Are Plotted for the Action of a Histone-Modifying Enzyme

question 10

Multiple Choice

Data are plotted for the action of a histone-modifying enzyme (solid lines) in two graph formats in Figure 4.10.Dashed lines indicate the data for the enzyme in the presence of an effector molecule, deoxycytidine triphosphate (dCTP) . Which statement is not true regarding this enzyme, its substrate (histone protein) , and its effector dCTP?

• A)The effector dCTP increases the Km.
• B)The enzyme is under allosteric control.
• C)The influence of the effector is reduced at high substrate (histone) concentrations.
• D)The enzyme obeys Michaelis-Menten kinetics.
• E)dCTP is an inhibitory effector of enzyme activity.

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