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Other quiz:

Blood clotting › View

What substance is needed to convert fibrinogen to fibrin?

A. Thrombokinase

B. Thrombin

C. Prothrombin

D. Thrombus

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Disease and Immunity › View

Passive and active immunity have which of the following features in common?

1. They are always long-term
2. They always involve the activity of memory cells
3. They involve antibodies
4. They can be acquired by vaccination

A. 1 and 2

B. 2 and 3

C. 3 only

D. 3 and 4

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