Which type of medium typically contains an indicator dye?
A) selective but not differential
B) differential but not selective
C) both selective and differential
D) neither selective nor differential
Answer: B
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In the process of nitrogen assimilation, ____ is converted to ____, which is then rapidly used to synthesize organic
molecules.
a. NH4+; NO3- b. N2; NO3- c. NO3-; NH4+ d. NH3; NH4+ e. NO3-; N2
Four of the five substances listed below are
polysaccharides. Select the exception. a. chitin b. cellulose c. hemoglobin d. starch e. glycogen
Compare and contrast the life-forms found in Domains Bacteria, Archaea, and Eukarya
What will be an ideal response?
You cut some sheep DNA and some plasmid DNA with the same restriction enzyme. The plasmid contains an AmpR gene and a lacZ gene. You mix together the fragments of sheep DNA and the linearized plasmid. You transform bacteria with your mixture, and plate the bacterial cells on growth media containing the antibiotic ampicillin and X-gal (the substrate of beta-galactosidase). You need to pick some bacterial colonies that contain recombinant plasmids. Which colonies do you choose?
A. Any colony; if they grow on the media they are recombinant. B. The blue colonies; any cells containing eukaryotic (sheep) DNA will be blue. C. The white colonies; only cells that contain a recombinant plasmid will be white. D. The large colonies; large colonies are more resistant to the antiobiotic and thus more likely to contain a recombinant plasmid. E. Any colony, all colonies will contain plasmids; it requires additional testing to determine if the plasmid is recombinant.