An Hfr strain of E. coli with the genotype a+b+c+d+e+f+ is mated with an F- auxotrophic strain with the genotype a-b-c-d-e-f-. Conjugation is stopped at 10-minute intervals and the genotypes of the resulting conjugants are determined
The following results are obtained: After 10 minutes e+ After 20 minutes a+e+ After 30 minutes a+b+e+ After 40 minutes a+b+d+e+ After 50 minutes a+b+c+d+e+ After 60 minutes a+b+c+d+e+f+ What is the correct order of genes on this bacterial chromosome?
e-a-b-d-c-f
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Laboratory isolation of Nanoarchaeum equitans requires the presence of
A) fatty acids. B) oxygen. C) Ignicoccus. D) sunlight.
Which of the following is an advantage of molecular pharming?
A. Proteins are more likely to function properly when expressed in bacteria. B. Certain proteins may be degraded rapidly when expressed in mammals. C. The yield of recombinant proteins in mammalian milk is quite large. D. Post-translational modifications do not occur in mammals. E. Proteins are more stable when expressed in bacteria.
In which region of the plant are you most likely to find cells dividing by mitosis?
A. The growth rings B. The sapwood C. The meristem region D. The heartwood
Polyploid individuals that arise from chromosome duplications within a single species are called
a. allopolyploids. b. tetraploids. c. triploids. d. autopolyploids. e. sympatric polyploids.