Question

✪ Biology ✪
Question of class 11th.
Explain the following terms :-
a) Nature of enzyme action.
b) Factors affecting enzyme activity.
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Answer 1

Answer:

Explanation:

Concentration of Enzyme: As the concentration of the enzyme is increased, the velocity of the reaction proportionately increases (Fig.

Concentration of Substrate: ADVERTISEMENTS: Increase in the substrate concentration gradually increases the velocity of enzyme reaction within the limited range of substrate levels.

Effect of Temperature: Velocity of an enzyme reaction increases with increase in temperature up to a maximum and then declines.

Effect of pH: Increase in the hydrogen ion concentration (pH) considerably influences the enzyme activity and a bell-shaped curve is normally obtained

Answer 2

❏ Nature Of Enzyme...✒

• All enzymes are proteinaceous in nature (Sumner, 1926) with the exception of recently discov­ered RNA enzymes.

• Some enzymes may additionally contain a non-protein group.

❏ Factors Affecting Activity...✒

• Enzyme activity is affected by various factors, including substrate concentration and the presence of inhibiting molecules.

• The rate of an enzymatic reaction increases with increased substrate concentration, reaching maximum velocity when all active sites of the enzyme molecules are engaged.

• Thus, enzymatic reaction rate is determined by the speed at which the active sites convert substrate to product.

• Inhibition of enzyme activity occurs in different ways. Competitive inhibition occurs when molecules similar to the substrate molecules bind to the active site and prevent binding of the actual substrate.

• Noncompetitive inhibition occurs