For heparin which of the following is ?

A. Inhibits conversion of fibrinogen to insoluble fibrin
B. Interferes with action of thrombin
C. Is released by macrophages
D. Is released by mast cells

Hemoglobin has______________?

A. Four polypeptide chains, 2α, 1β,1Υ chain
B. Four heme molecules and four polypeptide chains
C. Four heme molecules, 2α and 2β chains
D. One heme and one globin molecule

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