Question

Following is the graph related to enzyme activity:-

Choose the correct option :-

• A. $A=pH,B=$ Enzyme activity, $C=K_{m}$
  constant, $D=V_{max}$
• B. $A=$ Velocity of reaction, $B=pH,C=$ $\frac{V_{max}}{2},D=$ Concentration of substrate
• C. $A=$ Concentration of substrate, $B=\frac{V_{max}}{2}$ $C=K_{m}$ constant, $D=$ Velocity of reaction
• D. $A=$ Concentration of substrate, $B=\frac{V_{max} .}{2}$
  $C=K_{m}$ constant $,D=V_{i}$

Answer 1

Answer: (C)

The graph represents the concentration of substrate on enzyme activity, where

• A- Concentration of substrate
• B- V_max/2
• C- K_m constant
• D- Velocity of reaction

With the increase in substrate concentration, the velocity of the enzymatic reaction rises at first. The reaction ultimately reaches a maximum velocity (V_max) which is not exceeded by any further rise in the concentration of the substrate. This is because the enzyme molecules are fewer than the substrate molecules and after saturation of these molecules, there are no free enzyme molecules to bind with the additional substrate molecules.