A) As [S] increases, the initial velocity of reaction Vo decreases. e becomes a

ID: 211095 • Letter: A

Question

A) As [S] increases, the initial velocity of reaction Vo decreases. e becomes a horizontal line that intersects the y-axis at Km C) D) E) Km is the [S] at which Vo = v,max. The shape of the curve is hyperbolic. The x-axis is a rate term with units of M/min. 41- The number of substrate molecules converted to product in a given unit of time by a single enzyme molecule at saturation is measured in which units? A) M B) S C) M1 E) M1s1 42 -Which of the following complexes is found in a competitive inhibitor but not uncompetitive inhibitor? A) Empty enzyme B) Enzyme-substrate complex C) Enzyme-product complex D) Enzyme-inhibitor complex E) Enzyme-inhibitor-substrate complex 43 - Which of the following statements if true of covalent catalysis? A) The substrate is covalently attached to the enzyme B) The product is covalently attached to the enzyme C) The transition state is covalently attached to the enzyme D) The active site amino acid is not modified during the reaction mechanism E) The enzyme is not restored to its original state 44- What happens in both a ping-pong mechanism enzyme catalyzed reaction and a sequential ordered enzyme catalyzed reaction? A) Enzyme modification B) Binding of a specific substrate before a second substrate C) Only one substrate in the reaction D) The formation of a ternary complex E) Random order of substrate binding

Explanation / Answer

41. The number of substrate converted to product in a given time by an single enzyme is known as turnover number. Its units of inverse time. Hence, option”D” is correct.

42. The complex that is formed in competitive inhibition is

Enzyme-substrate- inhibitor complex

Because in competitive inhibition, both substrate and inhibitor compete for binding in active site of the enzyme.

Hence, option “E” is correct.

43. In covalent catalysis, substrate is attached with the enzyme covalently. Hence, option

“A” is correct.

44. In ping-pong mechanism of enzyme, binding of a specific substrate before a second substrate. Hence, option “B” is correct.

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A) As [S] increases, the initial velocity of reaction Vo decreases. e becomes a

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