In southern copperhead snake venom, you'll find a protein called a disintegrin. Disintegrins bind to a class of membrane receptors called integrins. Platelets use integrin receptors to aggregate at a site of tissue damage
What effect do you think disintegrin has on the snake's prey? A) After the snake bites its prey, the molecule helps in wound healing.
B) The molecule helps kill the snake's prey by producing large clots that cause heart attacks and strokes.
C) The molecule interferes with clot formation so the venom can travel through the body more efficiently.
D) By binding to the platelets, the molecule increases the formation of fibrin.
C
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A PrPc protein can convert a PrPSc to a PrPc.
Answer the following statement true (T) or false (F)
Enzymes in living organisms typically work best near the pH of the tissues where they are found; you would predict that the pH optimum for pepsin would be near ________
a. 7 b. 2 c. 4 d. 11
Although most biologists do not consider viruses to be alive, viruses do share some characteristics with living things. Which of the following is the requirement for life that viruses lack?
A. The ability to move B. Having genetic material C. Having highly ordered structure D. The ability to reproduce on their own
The kidney was one of the first organs to be successfully transplanted because it is so encapsulated and has limited vessels feeding into or out of it. How many major "connections" must be cut in transplant surgery for one kidney?
A. two: the renal artery and vein B. three: the renal artery and vein and the urethra C. three: the renal artery and vein and the ureter D. five: the renal artery and vein, two ureters, and one urethra E. four: the renal artery and vein, the ureter, and urethra