Which of the following protein act as enzymes? ans. Haemoglobin All of the above Insulin Isomerase

The protein that acts as an enzyme from the given options is Isomerase. Enzymes are proteins that significantly speed up the rate of virtually all of the chemical reactions that take place within cells. They are vital for life and serve a wide range of important functions in the body, such as aiding in digestion and metabolism.

Here's a brief explanation of each option:

1. Haemoglobin: This is a protein in your red blood cells that carries oxygen to your body's organs and tissues and transports carbon dioxide from your organs and tissues back to your lungs. But it does not act as an enzyme.

2. All of the above: This option would imply that Haemoglobin, Insulin, and Isomerase all act as enzymes. But as explained, not all of them are enzymes.

3. Insulin: This is a hormone made by the pancreas that allows your body to use sugar (glucose) from carbohydrates in the food that you eat for energy or to store glucose for future use. Insulin helps keeps your blood sugar level from getting too high (hyperglycemia) or too low (hypoglycemia). It does not act as an enzyme.

4. Isomerase: This is an enzyme that catalyzes the rearrangement of atoms within a molecule. So, this is the correct answer.