regarding the Michaelis constant (K of the following statements is a rough measu

Question

regarding the Michaelis constant (K of the following statements is a rough measure to the affinity between Which a. It b. c. The d. It 54 s for the Michaelis constant is the enzyme and substrate. The dimension Michaelis constant is inversely proportional the Vmax is the substrate concentration necessary to reach 1/2 Vmax. suc conentoporcentration, such as molarity. e. All of the above statements are true. 55. Enzyme regulatory mechanisms involvi a protein kinase to ng reversible covalent modification use add phosphate and a phospha a. oxidoreductase b. transferase to enzyme class? e. lyase tase to remove it. Kinases belong c. hydrolase d. isomerase

Explanation / Answer

Question 54: The correct answer is, c. The Michaelis constant is inversely proportional the Vmax.

Explanation:

The rate of an enzyme-catalyzed reaction depends on the substrate concentrations. At the low concentration of substrate, the initial velocity increases linearly when the substrate concentration increases. The reaction reaches the maximum velocity (Vmax) by increasing the substrate concentration and after that, the rate does not increase any further by increasing the substrate concentration. The relation between the reaction velocity and substrate concentration follows a hyperbola.

The Michaelis-Menten constant (Km) is the substrate concentration at which the reaction velocity reaches half its maximum velocity. The Km value indicates the enzyme-substrate binding affinity. When the value of Km is low, the affinity of the enzymes for the substrate is greater. The dimension of Km is concentration such as Molarity. The Km does not determine the Vmax.

So, The Michaelis constant is inversely proportional the Vmax - this statement is false.

Question 55: The correct answer is b. transferase.

Explanation: There are six different classes of enzymes. These are Oxidoreductase, Transferase, Hydrolase, Lyase, Isomerase, and Ligase.

Transferases are those enzymes that catalyze the transfer of groups from one molecule to another molecule. Kinases transfer phosphate from ATP to substrate. Therefore kinase belongs to transferase.

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