Extremely high or low doses of an immunogen may suppress a specific immune response by stimulating the development of
A) specificity.
B) memory.
C) tolerance.
D) class switching.
Answer: C
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Which of the following is not true of the kinetic proofreading reaction of bacterial RNA polymerase?
A. rNTP is the product. B. It occurs when the enzyme stalls after incorporating a mismatched base. C. The type of reaction is pyrophosphorolysis. D. Water is the nucleophile. E. Pyrophosphate is a reactant.
According to research done by Baron, Caughey, and Prado, how do prions move within the brain?
a. They use receptors on the surfaces of nerve cells. b. They use vesicles found inside the nerve cells. c. They use tunneling nanotubes. d. They pinch off the nerve cell membrane. e. They stick to the outer surfaces of nerve cells.
The pulmonary circuit ____
a. involves the hepatic portal vein b. moves oxygen-rich blood to the kidneys c. includes the coronary arteries d. leads to, through, and from the lungs e. receives blood from the left ventricle
The principle of independent assortment states that
a. one allele is always dominant to another. b. hereditary units from the male and female parents are blended in the offspring. c. the two hereditary units that influence a certain trait segregate during gamete formation. d. each hereditary unit on one chromosome is inherited separately from hereditary units on other chromosomes. e. genes on the same chromosome travel separately.