The first DNA genome sequenced was from a
a. virus.
b. bacterium.
c. human.
d. fungus.
Answer: A
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On a phylogenetic tree, distantly related species diverge from branch points nearer to the tree's:
A. base. B. branches. C. tips. D. trunk.
The rate of aerobic respiration in plants depends upon the
a. availability of oxygen. b. lifestyle stage. c. temperature. d. all of these
Only nine types of aneuploids are known in newborns because
A) only nine chromosomes undergo nondisjunction. B) most types of aneuploids are lethal early in development. C) most aneuploids do not cause detectable defects. D) most aneuploids do not affect the phenotype.
Large, high molecular-weight proteins are always found
a. nearer the top of the gel. b. close to the middle of the gel. c. nearer the bottom of the gel.