Question

Given below are two statements:

Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement II: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.

In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are false.
• B. Statement I is true but Statement II is false.
• C. Statement I is false but Statement II is true
• D. Both Statement I and Statement II are true.

Answer 1

Answer: (D)

Both Statement I and Statement II are true.

Answer 2

Statement I is true - Low temperatures can slow down enzymatic reactions by placing the enzyme in an inactive state, and high temperatures can denature proteins, including enzymes, which can lead to a loss of enzymatic activity.

Statement II is also true - A competitive inhibitor is a molecule that closely resembles the substrate of an enzyme and competes for the active site, thus reducing the enzyme's activity. This type of inhibition is called competitive inhibition.

So, the correct option is (D): Both Statement I and Statement II are true.