Imagine that it is 1965 and the bacterium Thermus aquaticus has not yet been discovered. As a geneticist interested in forensics applications, you are attempting to develop a gene-amplifying technique similar to PCR
In a test tube, you place a DNA sample, free nucleotides, human DNA polymerase, and the appropriate primers for the DNA sequence being analyzed. You first heat the sample to 90°C, then cool it to 50°C, and then reheat it to 70°C.
Based on this scenario and your knowledge of how modern PCR works, the result of these procedures will be
A) unsuccessful, because the enzyme will denature during the second step (cooling).
B) unsuccessful, because the enzyme will denature during the first step (heating).
C) unsuccessful, because the enzyme will denature during the third step (reheating).
D) unsuccessful, because human DNA polymerase cannot recognize the primers used.
E) successful copying of the DNA, because it follows modern PCR procedures almost perfectly.
B
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The favoring of the heterozygote within the
population is an example of a
a. balanced polymorphism. b. genetic drift. c. the Red Queen effect. d. sexual selection. e. disruptive selection.
Which of the following is not a characteristic of all plants?
A. They are autotrophs. B. They are eukaryotes. C. They are multicellular organisms. D. They are heterotrophs. E. They carry out photosynthesis.
The synthesis site for the hormones of this figure is
indicated by a. A. b. B. c. C. d. D. e. E.
Fixation of carbon is accomplished by:
a. photosynthetic organisms. b. primary consumers. c. decomposers. d. bacterial decomposers. e. burning of organic matter