Labs intended to work with highly infectious airborne pathogens, such as tuberculosis, are classified as
a) BSL-1.
b) BSL-2.
c) BSL-3.
d) BSL-4.
Ans: c) BSL-3.
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Which type of morphologic evidence shows the closest evolutionary relationship?
a. analogous structures b. structural plasticity c. homologous structures d. structural functions
Which ponds contained only killifish as predators?
a. primero and quinto b. segundo, tercero, and sexto c. tercero and quinto d. quarto, sexto, and septimo e. none of the above (all ponds containing killifish also contained cichlids)
The ideal agricultural soil is:
a. loam. b. silt. c. sand. d. clay
e. dry.Genetic analysis indicates that an unknown organism contains a gene that codes for a defective form of telomerase. Based on this information alone, you can conclude that this organism
A. is eukaryotic. B. is prokaryotic. C. has unusually long telomeres. D. has an increased risk of developing cancer.