Question

In the process of clotting enzyme prothrombinase requires ______ ions to convert prothrombin to thrombin.

• A. Ca$^{++}$
• B. Mn$^{++}$
• C. Mg$^{++}$
• D. Na$^{++}$

Hint:

Calcium ions play a crucial role in multiple steps of blood coagulation.

Answer 1

The Correct Option is A

Step 1: Understanding blood clotting.
Blood clotting is a complex enzymatic cascade involving several clotting factors.
Step 2: Role of calcium ions.
Calcium ions are essential cofactors for prothrombinase to convert prothrombin into thrombin.
Step 3: Conclusion.
Thus, the correct answer is (A) Ca$^{++$}.