1a.) In the graph shown which of the following statements is TRUE concerning the
ID: 175418 • Letter: 1
Question
1a.) In the graph shown which of the following statements is TRUE concerning the "plateau" region of the curve?
A.) All the available substrate has been converted to product
B.) The enzymes active site is saturated.
C.) The enzyme is in the tense state.
D.) A and C.
E.) A and B
1b) Which of the following statements about phosphorylation of enzymes is FALSE?
A.) Phosphorylation is a reversible covalent modification.
B.) The phosphorylation of an enzyme results in a change in its conformation, thereby increasing its activity.
C.) The phosphorylation of enzymes is catalyzed by other enzymes called kinases.
D.) The phosphorylation of enzymes is one mechanism via which hormones elicit an intracellular response.
A.) All the available substrate has been converted to product
B.) The enzymes active site is saturated.
C.) The enzyme is in the tense state.
D.) A and C.
E.) A and B
1b) Which of the following statements about phosphorylation of enzymes is FALSE?
A.) Phosphorylation is a reversible covalent modification.
B.) The phosphorylation of an enzyme results in a change in its conformation, thereby increasing its activity.
C.) The phosphorylation of enzymes is catalyzed by other enzymes called kinases.
D.) The phosphorylation of enzymes is one mechanism via which hormones elicit an intracellular response.
Explanation / Answer
1a. Ans:B
At high substrate concentration, the rate of reaction reaches plateau as the enzymes active sites becomes saturated with substrate and no free enzyme for binding the substrate.
1b. Ans: B
The phosphorylation of an enzyme results in a change in its conformation, but after phosphorylation enzyme can be activated or deactivated. Its not a thumb rule that after phosphorylation enzyme activity is always increased.
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