The oldest of the Eras that make up the geological time scale is the
a. Hadean.
b. Paleozoic.
c. Mesozoic.
d. Cenozoic.
e. Jurassic.
A
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Which structure is derived from an ancestral air-breathing lung in ray-finned fishes and is used to increase buoyancy?
a. swim bladder b. spiral valve c. operculum d. atrium e. lateral-line system
After mixing a heat-killed, phosphorescent (light-emitting) strain of bacteria with a living, nonphosphorescent strain, you discover that some of the living cells are now phosphorescent
Which observation(s) would provide the best evidence that the ability to phosphoresce is a heritable trait? A) evidence that DNA was passed from the heat-killed strain to the living strain B) evidence that protein passed from the heat-killed strain to the living strain C) especially bright phosphorescence in the living strain D) phosphorescence in descendants of the living cells
Imagine that you have set up a genetic screen to identify E. coli mutants that cannot metabolize the amino acid tryptophan for energy. Beginning with a master plate containing many colonies, you prepare replica plates on medium with glucose or tryptophan as the only energy source. You would look for colonies that _____.
A) cannot grow on either type of media
B) can grow on both types of media
C) can grow only on the plates with tryptophan
D) can grow only on the plates with glucose
In a 3-point test cross, the least common offspring phenotypes always result from the ____________
a) non-recombinant gametes b) recombinant gametes from a single cross over between the first and middle gene c) recombinant gametes from a single cross over between the middle and last gene d) gametes from double crossovers