Retroviruses are characterized by ____
a. RNA that is used as a template to produce DNA in a host cell
b. integrating RNA into the host’s chromosome
c. the enzyme alkaline phosphatase
d. having one strain that causes H1N1
e. the lack of a protein coat
ANSWER: a
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Which one of the following is the external structure of the ear that enhances reception of sound waves?
A. tympanic membrane B. oval window C. cochlea D. pinna
Which of the following regulates the transportation of endangered species across international borders?
a. The Red List b. Migratory Bird Treaty Act c. CITES d. Endangered Species Act
The vertebrate lung first appeared in which organism?
a. fishes b. amphibians c. reptiles d. birds e. mammals