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Which of the following statement concerning enzyme-catalyzed reactions is CORRECT? The rate of an enzyme catalyzed...

  1. Which of the following statement concerning enzyme-catalyzed reactions is CORRECT?
  1. The rate of an enzyme catalyzed reaction is independent of substrate concentration.
  2. At saturating levels of substrate, the rate of an enzyme –catalyzed reaction is proportional to the enzyme concentration.
  3. The Km for a regulatory enzyme varies with enzyme concentration.
  4. If enough substrate is added, the normal Vmax of an enzyme –catalyzed reaction can be attained even in the presence of a noncompetitive inhibitor.
  5. The sigmoidal shape of the v-versus [S] curve for some regulatory enzymes indicates that the affinity of the enzyme for substrate decreases as the substrate concentration increases.
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Answer #1

Answer- CORRECT STATEMENT - A B and C

A) any change in the amount of product formed over a specified time period, will be dependent upon the level of enzyme present. These reaction is said to be "zero order" because the rattes areindependent on substrate concentration.

B) at saturating levels of substrate the rate of an enzyme catalysed reaction is directly proportional to the enzyme concentration

C) the Km for a regulatory enzyme varies with the enzyme concentration. In the simple case of monomeric enzyme with a single active site, the Km is independent of the enzyme concentration in principle. However, if the measurement is not dine under right condition for Michaelis- Menton kinetics, the Km may appearto vary with enzyme concentration.

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