Nosocomial infections are most often caused by
A) Escherichia coli.
B) Staphylococcus aureus.
C) Enterococcus.
D) Pseudomonas.
E) Klebsiella.
Ans: A) Escherichia coli.
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In competition between P. caudatum and P. bursaria, neither species goes extinct. This is because they don't utilize the same resources. This conclusion is generalized as the
A. extinction theory. B. the frequency of competition hypothesis. C. competition hypothesis. D. coexistence theory. E. competitive exclusion theory.
The muscles of the body wall are derived mainly from which embryonic cell layer in most
eumetazoans?
a. mesoderm b. epiderm c. mesoglea d. endoderm e. ectoderm
In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the heterozygote. If a long radish is crossed with a round radish, which of the following phenotypic ratios of the F2 generation is correct?
A. all round B. all oval C. 1/2 long, 1/2 oval D. 1 long, 2 oval, 1 round E. 1/2 oval, 1/2 round
Which is an example of a clumped distribution of a population?
A. A tree species releases a poison to defend the soil around its roots, resulting in trees spaced evenly like a grid. B. Multiple species join each other at the waterhole to drink. C. Antelope travel in herds. D. Two male hummingbirds have a confrontation on the border between their territories.