The final reaction in blood clotting is
A. prothrombin ? thrombin.
B. plasmin ? fibrin.
C. platelets ? prothrombin activator.
D. fibrinogen ? fibrin.
E. fibrin ? thrombin.
Answer: D
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A. GCA B. GCC C. UCU D. AGG E. UCC
Which of the following is a characteristic of nematodes?
a. Having nerve cords along the body b. Having a segmented body c. Having an incomplete digestive system d. Having a specialized excretory system
Women with polycystic ovarian syndrome have difficulty conceiving because ____
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The total number of different three-base combinations of the four nucleic acid bases is:
a. 12. b. 16. c. 20. d. 64. e. 256.