In Situation 25.1, fecal samples should be cultured for all of the following EXCEPT
A) Salmonella enterica.
B) Shigella spp.
C) Campylobacter jejuni.
D) enteropathogenic Escherichia coli.
E) Giardia lamblia.
E
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A (n) ________ vector contains promoters that result in high-level transcription of the gene cloned within a multicloning site.
A. expression B. shuttle C. chimeric D. phage
Which one of the following is not a characteristic shared by miRNA and mRNA?
A. They are both encoded by genes on chromosomes. B. They are both transcribed using the same RNA polymerase and general transcription factors. C. They both have a 5' cap and are both spliced. D. They both fold upon themselves, forming stems and hairpin loops that are stabilized by hydrogen bonding. E. They both have a 3' poly(A) tail.
Imagine that a cell has a genetic mutation so that the primase enzyme is unable to make RNA strands
Assuming that all of the other enzymes directly involved in DNA replication are still functional in these cells, how much of the process of DNA replication would you expect to see in these cells?
a. The leading strand would be synthesized, but not the lagging strand. b. None of it at all, no part of the DNA replication process could occur. c. The DNA helix would be unwound by helicase, but no new strands will be produced at all. d. Both the leading and lagging strand would be synthesized, but pieces of discontinuous strands would not be joined together. e. DNA replication would still proceed completely, since RNA strands are not part of the final product of DNA replication.
While eating lobster for dinner one night your friend asks what you think might happen if this marine invertebrate, which is normally isosmotic with respect to the surrounding seawater, were to be moved to a bay with a slightly lower salt concentration instead of being caught. You reply that, in order for the lobster to be isosmotic with respect to new environment,
A. it regulates its internal concentration of solutes to match that of its new environment. B. it moves water in or out and regulates its internal concentration of water as needed. C. it must move water in to match the solute concentration of its new environment. D. it must move water out to match the solute concentration of its new environment.