Mucus secreted by mucous membranes provides protection against infections by

A) forcing the pathogen to die in the struggle to free itself (like a fly strip).
B) trapping and removing pathogens.
C) phagocytosing pathogens by macrophages.
D) destroying pathogens by the complement system.
E) drowning the pathogen.


Ans: B) trapping and removing pathogens.

Biology & Microbiology

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In the testing of water for coliforms, the presumptive test involves detection of

A. sheen production on a selective medium. B. a gram-negative nonspore-forming rod. C. gas production in a lactose broth medium. D. All of these choices are correct.

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A single oak tree can support hundreds of beetles, caterpillars and other primary consumers. Such a phenomenon is an example of

A. a pyramid of biomass. B. excessive levels of primary production. C. an unusually diverse group of primary consumers. D. primary parasitism. E. an inverted pyramid of numbers.

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Cells that produce antibodies and provide future immunity against similar pathogens are

A) mast cells. B) natural killer cells. C) T cells. D) dendritic cells. E) B cells.

Biology & Microbiology