Enzyme kinetics. (0.5pt each) The following graph represents the Michaelis-Mente
ID: 201206 • Letter: E
Question
Enzyme kinetics. (0.5pt each) The following graph represents the Michaelis-Menten plot of initial reaction velocity against substrate concentration for a hypothetical enzyme. Three parts of the graph are labeled-A, B, and C. Choose the letter on the graph that best corresponds to each statement below. Note- you will use each letter (A, B, or C) twice Substrate concentration [S 6. Reaction velocity is limited mainly by the number of substrate molecules present 7. Reaction velocity is limited mainly by the number of enzyme molecules present. 8. This is the range of substrate concentration in which most enzymes usually function in normal cells. 9· The active site ofan enzyme molecule is free most of the time. 10. The active site of an enzyme molecule is occupied by substrate most of the time. 11. This includes the point corresponding to Km or Vmax/2. 12. (Ipt) Consider a situation in which the enzyme is operating at optimum temperature and pH, and has been saturated with substrate. What is your best option for increasing the rate of the reaction? a. Increase the substrate concentration. b. Decrease the substrate concentration. c) Increase the enzyme concentration. d. Increase the substrate concentration.Explanation / Answer
6. The correct option is A.
Velocity is limited by the concentration of substration shows that the concentration of substrate is small. Hence, A.
7. The correct option is C.
This situation will arise when the substrate concentration is high and enzyme concentration is low. In this case, the velocity is limited by the enzyme concentration.
8. The correct option is B.
Enzymes will function normally only when there is an equivalent quantity of enzyme with substrate. This is possible in the middle of the curve.
9. The correct option is A.
Enzymes will be mostly free only when substrate is in low quantity.
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