The organisms included within any category of the taxonomic hierarchy comprise a(n) ____

a. family
b. class
c. order
d. taxon
e. domain


ANSWER: d

Biology & Microbiology

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Trypanosomes are effective parasites of humans because they evade the immune system by __________.

a. colonizing the exterior, rather than the interior, of the body b. entering cells of the immune system itself c. sequentially changing surface proteins d. only spending a short period of time in the body before moving on to another host e. producing highly specialized cells that together make up an integrated, multicellular organism

Biology & Microbiology

Sea lions can live into their thirties and produce no more than one pup per year. A sea lion is a(n) ____ species

a. type II b. opportunistic c. K-selected d. r-selected e. type III

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Which nitrogenous waste product would be least toxic to an embryo developing in the aqueous

environment found inside a shelled egg? a. ammonia b. urea c. uric acid d. amino acids e. purines

Biology & Microbiology

Cells that can engulf foreign particles, and can ingest, kill, and digest most bacterial pathogens are called

A) red blood cells. B) phagocytes. C) reticulocytes. D) resistant cells.

Biology & Microbiology