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Fibrinogen, the protein of blood plasma is converted to insoluble protein fibrin during the clotting process. The fibrinogen free fluid, obtained after removal of the clot, called blood serum, is plasma minus fibrinogen.

1. Fibrinogen is a protein involved in blood clotting.
2. Blood serum is plasma minus fibrinogen.
3. Fibrinogen is converted to fibrin during clotting.
4. All of the above.

Correct answer: All of the above.

Solution

The passage states that fibrinogen is a blood-plasma protein involved in clotting, that it is converted into fibrin during clot formation, and that serum is plasma minus fibrinogen. Since A, B, and C are all true, the correct choice is the one that includes all of them.

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