A single DNA molecule contains two specific target sites separated by an intervening sequence. If site-specific recombination between these sites causes the intervening sequence to be released as a separate circular DNA molecule containing one target site, then the sites were oriented in
A) opposite directions causing excision.
B) the same direction causing excision.
C) opposite directions causing integration.
D) the same direction causing integration.
E) the same direction causing inversion.
B) the same direction causing excision.
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Insulin is a product of
A. pancreatic ?-cells. B. pancreatic ?-cells. C. pancreatic exocrine cells. D. the kidney. E. the liver.
The birth rate in a population of 400 feral cats
is 100 per year. The death rate in this same population is 40 per year. The per capita growth rate of this population of feral cats is ___ per cat per year.
a. .25 b. .1 c. .15 d. .4 e. 0
Which special property of Taq polymerases make them useful for PCR?
a. they are stable at high temperatures b. their hydrogen bonds do not break at low pHs c. they multiply quickly d. they are easy to isolate from common fungi e. they paste two DNA fragments together
Transfusion reactions are the result of antibody reaction to
A) glycolipids and glycoproteins on the surface of red blood cells. B) MHC molecules on red blood cells. C) MHC molecules on white blood cells. D) plasma proteins. E) foreign antibodies.