Which of the following primary immunodeficiencies is the most common?
A.
Severe combined immunodeficiency
B.
Selective IgA deficiency
C.
Agammaglobulinemia
D.
Di George's syndrome
B
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As compared to the circulatory system of most fishes, the circulatory system of adult amphibians has the advantage of
A. a four-chambered heart. B. complete separation between oxygenated and deoxygenated blood. C. partially-separate circuits for gas exchange and systemic delivery of blood. D. a pocket of the gut that serves as an air bladder. E. a single circuit.
To create transgenic mice, DNA is injected into
A) a pronucleus of a zygote. B) the cytoplasm of a zygote. C) the nucleus after the pronuclei have fused. D) a pronucleus of one cell from an embryo.
Most kidney problems in the United States
result from a. viral infections. b. diabetes mellitus or high blood pressure. c. arsenic or lead poisoning. d. chronic overdoses of aspirin. e. accidental inhalation of pesticides
E. coli DNA polymerases IV and V are
a. for restarting replication. b. RNA-dependent DNA polymerases. c. for priming replication. d. DNA replicases. e. error-prone polymerases.