A person with neither anti-A nor anti-B antibodies in circulation has which of blood type?
A) A
B) B
C) AB
D) O
C) AB
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The infectious dose for cholera is much larger than that for shigellosis
Indicate whether this statement is TRUE or FALSE.
In some cases, inhibitors or activators of
enzyme-catalyzed reactions act by a. binding to the substrates. b. affecting the supply of ATP. c. reversibly binding to an enzyme's allosteric site. d. reducing or increasing the concentration of enzymes. e. binding to the products
Which of the following techniques is most commonly used to separate and analyze DNA by size?
A) PCR B) Agarose gel electrophoresis C) DNA microarray analysis D) Hybridization E) DNA libraries
Ecologists are concerned about amphibian populations because
A. amphibians are very sensitive to environmental change-they may be indicating serious problems. B. their loss would be an aesthetic loss to the planet. C. of the possibility of numerous medicinal uses. D. they are keystone species in many areas-their loss will cause other populations to crash. E. they are increasing to the point of competing with indigenous species.