What phenotype would you expect to see in a strain of E. coli with a mutation in the phr gene?
A) decrease in UV-induced mutations
B) increase in UV-induced mutations
C) decrease in reversion of base-pair substitution mutations
D) increase in the methylation of nucleotide bases
E) decrease in the methylation of nucleotide bases
B
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Which of the following is not a eukaryotic retrotransposon?
A. gypsy B. Ty elements C. LINEs D. SINEs E. Tc1/mariner
__________ sampling can be used to estimate the population density for mobile animals and involves capturing and
releasing individuals. Fill in the blank(s) with the appropriate word(s).
Nematocysts are used for
a. reproduction. b. excretion. c. muscle action. d. circulation. e. defense.
Which of the following statements about ecological pyramids is true?
A. A pyramid of organism numbers will always have a large base and a small top. B. The limited number of trophic levels in an ecological pyramid is due to increasing complexity and size of organisms at each greater trophic level. C. Pyramids built upon the biomass of organisms at each level eliminate size as a factor. D. Energy gains between trophic levels occur based upon biomass conversion. E. None of the choices are true.