What method has been used to identify replication origins in bacteria?
What will be an ideal response?
The origin of a plasmid that contains a selectable marker such as AmpR was removed. The plasmid was ligated to fragments of DNA from the bacteria of interest and the resulting recombinants were transformed into the bacteria. If the transformed bacteria grew on ampicillin media then they contain a functional origin from the bacteria of interest.
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Four of the five choices below are white blood
cells that are capable of circulating in the blood. Select the EXCEPTION.
a. neutrophil b. mast cell c. macrophage d. eosinophil e. dendritic cell
Which type of crossover event produces no recombinant chromosomes?
A) single-strand crossover B) two-strand double crossover C) three-strand double crossover D) four-strand double crossover E) None of the above; all crossover events produce recombinant chromosomes.
How might you choose a region of DNA for a PCR primer so as to increase the temperature necessary for primer annealing (to minimize nonspecific PCR products)?
What will be an ideal response?
proteins are made of building blocks called
What will be an ideal response?