Which reaction during blood clotting is catalyzed by the enzyme thrombin?
a. fibrous fibrinogen to soluble fibrin
b. soluble fibrin to fibrous fibrinogen
c. fibrous fibrin to soluble fibrinogen
d. Soluble fibrinogen to fibrous

d. Soluble fibrinogen to fibrous fibrin

Explanation:

Thrombin is an enzyme (serine protease) that is activated from prothrombin in a cascade of reactions. It converts fibrinogen to fibrin.

Fibrinogen is a soluble glycoprotein produced from the liver and plays a critical role in clotting of blood, as a precursor for the formation of fibrin and also involved in platelet aggregation

Fibrin is a fibrous and tough non- globular protein that is involved in blood clotting. In blood clotting, fibrin and platelet combine to for a clot on a wound.

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands