Which of the following statements is not correct?

• A

  Insulin maintains sugar level in the blood of a human body.
• B

  Ovalbumin is a simple food reserve in egg-white.
• C

  Blood proteins thrombin and fibrinogen are involved in blood clotting.
• Correct answer
  D

  Denaturation makes the proteins more active.

Hence, the correct answer is option: 'D'.