The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure
b. a vestigial structure
c. an analogous structure
d. none of the above
a. a homologous structure
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S. pyogenes associated with invasive disease characteristically have
A. leukocidins. B. coagulase. C. streptococcal pyrogenic exotoxin A. D. streptococcal pyrogenic exotoxin B. E. streptococcal pyrogenic exotoxins A AND B.
An ecosystem is a community of ____ producers and ____ consumers that interact with one another and with their nonliving environment
a. energy-consuming; energy-producing b. primary; secondary c. autotrophic; heterotrophic d. heterotrophic; autotrophic e. nutrient cycling; heat producing
The largest nematode parasite of humans is
A. Anisakis simplex. B. Ascaris lumbricoides. C. Enterobius vermicularis. D. Fasciola hepatica. E. Wuchereria bancrofti.
The gut develops from the ____in most animal embryos
a. schizocoelom b. mesoglea c. archenteron d. enterocoelom e. blastopore