Drosophila biologists often diagnose species by crossing individuals from different populations. Implicit in this method is the:
a. evolutionary species concept. c. phylogenetic species concept.
b. phenetic species concept. d. biological species concept.
D
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SRY is
A) a single-region Y gene. B) a Y-inactivation center gene. C) the sex-determining region of the Y chromosome. D) a Y-controlling element. E) None of these
Which of the following are sugar-transporting cells in angiosperms?
a) parenchyma cells b) tracheids and vessel elements c) sieve-tube elements d) collenchyma cells e) clerenchyma cells
To make a vaccine against mumps, measles, or rabies, which type of viruses would be useful?
A) dsDNA viruses B) negative-sense ssRNA viruses C) positive-sense ssRNA viruses D) dsRNA viruses
Warts are caused by
A) papillomavirus. B) poxvirus. C) herpesvirus. D) parvovirus. E) Staphylococcus aureus.