Explain how radiometric dating allows scientists to determine the age of a particular fossil
What will be an ideal response?
ANSWER: Radioactive isotopes decay in a very predictable way. By knowing the approximate
concentration of a radioisotope that is naturally present, and determining the concentration of
the radioisotope in the fossil, you can calculate the length of time that it took for the
radioactive isotope to decay to the level in the fossil.
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European explorers sailing across the Pacific leave several pairs of pigs on a remote island with the intention of visiting again in future years to harvest fresh meat. This would most resemble a case of artificially induced allopatric speciation through:
A. vicariance. B. dispersal.
Sympatric species are
A. more likely than allopatric species to display character displacement. B. always show character displacement. C. less likely than allopatric species to display character displacement. D. unlikely to be competing. E. more likely than allopatric species to display character displacement, less likely than allopatric species to display character displacement, and unlikely to be competing.
If the age-specific fertility rate is such that 100 females of age class x would produce 50 offspring, what is the contribution of age class x to the overall population growth rate?
A. 0.75 B. 0.5 C. 2 D. 50 E. cannot be calculated with this information.
The presence of which combination of molecules would lead to active transcription of an operon?
A) activator + corepressor B) activator + repressor C) inducer + corepressor D) repressor + corepressor E) activator + inducer