Of the 400 living species of nonhuman primates, __________ are critically endangered
a. 250
b. 150
c. 40
d. 25
Ans: c. 40
Biology & Microbiology
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A plant stem would be considered to be
a. a shoot system. b. a tissue. c. a root system. d. a meristem. e. an organ.
Biology & Microbiology
The enzyme that HIV uses to copy its RNA into DNA is
A. RNA integrase. B. transcriptase. C. reverse transcriptase. D. DNA polymerase. E. RNA polymerase.
Biology & Microbiology
Based on hierarchical levels of biological organization, which of these choices represents the broadest level?
A. Jaguars, giant anteaters, macaws, capybaras B. Endocrine system C. 3 toed sloths D. Amazon Basin E. School of piranhas
Biology & Microbiology
In a 3-D double helix model of DNA, the center consists of ____.
A. deoxyribose sugars B. nitrate groups C. nucleotide base pairs D. phosphate groups E. sugar–phosphate backbones
Biology & Microbiology