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
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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.
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
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
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