Which disease is an example of an emerging disease?
a. Influenza
b. H5N1
c. Genital warts
d. Mumps
e. Measles
b
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Melanocytes ultimately arise from
A. the endoderm. B. the mesoderm. C. the ectoderm. D. the notochord. E. the neural tube.
Which of the following statements is not true about natural selection?
a. Offspring of individuals that are better adapted will make up a larger proportion of the next generation. b. Natural selection directs evolution by preserving traits acquired during an individual's lifetime. c. Natural selection depends on the genetic variability in a population, which arises through mutations. d. Natural selection acts to preserve favorable traits and eliminate unfavorable traits. e. Natural selection leads to adaptive evolutionary change.
In performing a ten-fold dilutions series from a sample containing 10,000 bacteria per milliliter, the fourth tube in the dilution series will have 10 cells per milliliter
Indicate whether the statement is true or false
Thick- skinned rhinoceroses and elephants were once classified together as pachyderms (meaning "thick skin"). They actually descended from different ancestors that in turn evolved from a thin-skinned common ancestor that was not included in the pachyderms. Pachyderms were therefore, as a taxon,
A. monophyletic. B. paraphyletic. C. a kingdom. D. polyphyletic. E. a supergroup.