What class of antibodies is normally found in the mucosa of the respiratory tract?

a. IgA
b. IgD
c. IgE
d. IgG
e. IgM


A

Biology & Microbiology

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White matter consists of:

a. cell bodies b. dendrites c. axon terminals d. myelinated axons e. meninges

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_____ is known as a cardiac pacemaker

a. Diastole b. Systole c. Cardiac muscle d. SA node e. AV node

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Toads of the genus Bufo can secrete enough poison to kill a 100 pound dog. What is the source of this

poison? a. epithelial cells b. goblet cells c. endothelial cells d. sweat glands e. oil glands

Biology & Microbiology

A culture medium on which only gram-positive organisms grow, and in which a yellow halo surrounds Staphylococcus aureus colonies, distinguishing S. aureus from other growing species, is best described as

a. a selective, but not differential medium. b. a differential, but not selective medium. c. an enrichment culture d. both a selective and differential medium. e. both a differential and enrichment culture.

Biology & Microbiology