According to Oparin's theory, primitive Earth's atmosphere must have lacked
A. oxygen.
B. hydrogen.
C. water.
D. nitrogen.
A. oxygen.
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Which of the following would NOT be included in the reaction chamber of an experiment intended to
duplicate the atmosphere of ancient earth? a. carbon dioxide b. hydrogen gas c. carbon monoxide d. water vapor e. nitrogen gas
The gradient distributions of alleles across continents reflect _____
a. the delineation of new races b. genetic drift c. human migration patterns d. protective alleles e. natural selection
Cells that are very sensitive to UV radiation most likely have a defect in the
A) base excision repair pathway. B) SOS repair pathway. C) nonhomologous end-joining pathway. D) nucleotide excision repair pathway. E) synthesis-dependent strand annealing pathway.
Which of the following types of plasmids allows a bacterial cell to kill its competitors?
A. virulence plasmids B. fertility plasmids C. bacteriocin plasmids D. resistance plasmids E. cryptic plasmids