The chemical elements that are available to producers are usually in what form?
a. ions
b. gases
c. solids
d. compounds
e. hydrocarbons
A
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Mendel used the ______ to determine whether an individual with the dominant phenotype was homozygous or heterozygous for that trait.
A. backcross B. testcross C. dihybrid cross D. F2 generation E. double cross
Seeds appeared in the fossil record by:
A. 100 million years ago B. 365 million years ago C. 545 million years ago D. 780 million years ago E. a billion years ago
A NASA probe returned samples of rocks from the surface of Mars. From these rocks, a prokaryotic organism was isolated and remained viable under conditions similar to that of Mars. The organisms are capable of dividing to replicate themselves. In order to determine whether the DNA replication of these organisms was semiconservative, an experiment using N15/N14 (similar to that of Mendelson and
Stahl) was performed. If the method of DNA replication were conservative, after one generation one would expect to see A) all of the DNA in the heavy (N15) band. B) all of the DNA in the light (N14) band. C) all of the DNA at a point midway between the heavy and light bands. D) half of the DNA in the light band, the other half in the heavy band. E) none of the above
If a mutation produced helicase that was unable to hydrolyze ATP, DNA replication would be
A. more prone to errors. B. speeded up. C. unaffected. D. stopped.