Which of the following is endemic in wild rodent populations of the western United States?
A. pneumonia
B. diphtheria
C. tuberculosis
D. anthrax
E. plague
Answer: E
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Species of the genus Thiobacillus
A. oxidize inorganic sulfur compounds and produce ATP. B. are ubiquitous in soil, freshwater, and marine environments. C. produce acids that leach metals out of ore. D. All of the choices are correct.
In order of their occurrence what are the steps in RNA interference?
A. Processing of RNA transcript by DGCR8, binding to RISC, transport to cytoplasm, processing by Dicer, binding to target mRNA B. Processing by Dicer, processing of RNA transcript by DGCR8, transport to cytoplasm, binding to RISC, binding to target mRNA C. Processing of RNA transcript by DGCR8, transport to cytoplasm, processing by Dicer, binding to RISC, binding to target mRNA D. Processing of RNA transcript by DGCR8, processing by Dicer, transport to cytoplasm, binding to RISC, binding to target mRNA
What can be assumed from these results?
In the Ames test, mutagenicity is normally tested on a strain of bacterium (Salmonella typhimurium) that cannot synthesize the amino acid histidine. Therefore, these bacteria require histidine in the growth plate to survive. A researcher performs the Ames test to evaluate the mutagenicity of a newly synthesized compound and notices that Salmonella typhimurium is living on a histidine-free growth plate. A. The newly synthesized compound induces a mutation in the bacteria. B. The bacteria no longer produce histidine. C. The bacteria produce histidine. D. The newly synthesized compound induces a mutation in the bacteria and the bacteria no longer produce histidine. E. The newly synthesized compound induces a mutation in the bacteria and the bacteria produce histidine.
Imagine that you are studying a very large population of moths that is isolated from gene flow. A single gene controls wing color. Half of the moths have white-spotted wings (genotype WW or Ww), and half of the moths have plain brown wings (ww). There
are no new mutations, individuals mate randomly, and there is no natural selection on wing color. How will p, the frequency of the dominant allele, change over time? A) p will increase; the dominant allele will eventually take over and become most common in the population. B) p will neither increase nor decrease; it will remain more or less constant under the conditions described. C) p will decrease because of genetic drift. D) p will fluctuate rapidly and randomly because of genetic drift.