Which strain of Escherichia coli may be involved in foodborne infection?
A. HB101
B. M309
C. AB220
D. O157:H7
D. O157:H7
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Adult stem cells are usually
A. differentiated. B. totipotent. C. pluripotent. D. multipotent.
Genes encoding the blood proteins myoglobin and hemoglobin are derived from a common gene ancestor. These proteins both occur in humans. The genes for myoglobin and hemoglobin are
A. analogs. B. topologs. C. paralogs. D. orthologs. E. pentalogs.
Which of the following describe source-sink metapopulations?
_____ Sink populations near source populations are less likely to go extinct. _____ Sink populations without access to immigrants from source populations are less likely to go extinct. _____ Source populations usually occupy better habitats. _____ Source populations are less likely to go extinct. _____ The emigration rate from source populations exceeds that from sink populations.
In cladistics, ________ is(are) the primary criterion used to classify organisms.
A. observable traits B. shared, derived traits C. mating behavior D. ecological niche E. All of the answer choices are correct.