Today, the fossil record
A. can be dated reasonably well only with uranium-238.
B. can be dated precisely, to within a single year, using DNA hybridization.
C. can be dated precisely, to within a single year, using radioactive isotopes.
D. can be dated reasonably well using a variety of radioactive isotopes with known half-lives.
E. can be dated only in terms of how layers relate to each other (i.e. older layers are below younger layers); no actual dates can be estimated.
Answer: D
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What would the result be when a soil is supplemented with S0?
A) dimethyl sulfide production due to mixotrophs B) organic carbon production due to anaerobes C) soil acidification due to chemolithotrophs D) syntrophic utilization of sulfite
The GAG codon, which codes for glutamic acid, is mutated to GUG, which now codes for valine. What type of mutation is this?
A. silent B. missense C. nonsense D. frameshift E. base pair deletion
Which of the following will result in an increase in population?
a. birth rates lower than death rates b. birth rates and death rates equal c. birth rates higher than death rates d. no birth rate and stable death rate
In fruit flies, the genes for body color and wing shape are linked. When a dihybrid black straight-winged fly is test-crossed with a double-recessive brown curly-winged fly, the frequency at which black curly-winged and brown straight-winged flies are seen in the progeny is called the _______ frequency.
A: mutation B: recombinant C: allele D: parental E: meiotic