Which disease is an example of an emerging disease?

a. Influenza
b. H5N1
c. Genital warts
d. Mumps
e. Measles


b

Biology & Microbiology

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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

Biology & Microbiology

Melanocytes ultimately arise from

A. the endoderm. B. the mesoderm. C. the ectoderm. D. the notochord. E. the neural tube.

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology