Which immunoglobulin is found in saliva, mucus, and mother's milk?

A. IgG
B. IgM
C. IgE
D. IgA
E. IgD


Answer: D

Biology & Microbiology

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In clinical isolates, the most likely identification of coagulase-positive, catalase-positive, gram-positive cocci that are penicillin resistant would be:

a. S. aureus. b. S. intermedius. c. Stomatococcus luteus. d. Micrococcus aureus.

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Which of the following statements about autosomal dominant inheritance is false? a. Achondroplasia is an example of an autosomal dominant trait

b. In a testcross, a heterozygote will produce affected offspring 50% of the time. c. Lethal dominant alleles arise through mutation but are gradually weeded out of the population. d. Both homozygous dominant and heterozygous individuals express an autosomal dominant trait.

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If the gp120 glycoprotein were damaged as a result of a mutation, HIV would have difficulty:

A. attaching its RNA to a host cell's ribosome. B. leaving a macrophage. C. assembling the capsid. D. inserting its genes into the host cell's genome. E. binding to a host cell.

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One can inject dyes of different sizes into a liver cell and determine those molecules that can readily pass through gap junctions. What sized molecules can pass through gap junctions?

A. >1,000 Daltons, but <1,500 Daltons B. >5,000 Daltons, but <10,000 Daltons C. >10,000 Daltons D. <1,000 Daltons E. >1,500 Daltons, but <5,000 Daltons

Biology & Microbiology