Which of these makes determining the evolutionary relatedness of different species based on the amino acid sequence of homologous proteins generally less accurate than determinations of relatedness based on the nucleotide sequences of homologous genes?
A) Silent mutations
B) Gene duplications
C) Translocation events that change gene sequences
D) Crossing-over
E) Independent assortment
Ans: A) Silent mutations
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Which of the following are eusocial (true social) insects? (Check all that apply.)
_____ ants _____ fruit flies _____ honeybees _____ termites _____ wasps
Which drug results in the development of infants
without arms or legs if taken during pregnancy? a. tetracycline b. thalidomide c. streptomycin d. salicylic acid e. codeine
The moon lacks life and varies dramatically in temperature. If we could keep a layer of water spread on the surface of the moon, what effect would it have?
A) Physical conditions would remain the same. B) Because water has a high heat of vaporization, the temperatures would rise to the upper extremes. C) The temperatures would drop to the lower extremes. D) Water would absorb and hold heat and moderate the temperature extremes. E) Life would be possible, but it would have to withstand these extremes in temperature.
PCR is essential for
A) allowing restriction enzymes to cut DNA. B) cutting DNA into many small pieces. C) making many copies of a small amount of DNA. D) creating recombinant plasmids. E) analyzing a person's fingerprints.