E. coli 0157:H7 characteristics include all the following except
A. it only causes occupational illness in people who work with animals.
B. it is transmitted by ingestion of contaminated, undercooked food, especially hamburger.
C. it causes a bloody diarrhea.
D. it is reservoir is cattle intestines.
E. some cases go on to hemolytic uremic syndrome (HUS) with possible kidney failure.
Ans: A. it only causes occupational illness in people who work with animals.
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You are injecting a dye into a eukaryotic cell to detect a specific functional enzyme in the cytosol. Where would you need to inject the dye?
A. You would have to inject the dye into the membrane of the rough ER. B. The dye would go between the plasma membrane and membrane of the organelles. C. Injection of the dye must occur in the inner membrane space of the mitochondria. D. The Golgi apparatus holds the cytosol, and therefore the dye must be injected there.
Geneticists construct linkage maps of chromosomes by
A) correlating a phenotype to an observable chromosomal abnormality. B) determining the number of crossovers between genes on different chromosomes. C) calculating the percent recombination between two genes on the same chromosome. D) observing the number of genes on a chromosome.
You take a gene (knolin) that is normally unresponsive to the presence of glucocorticoids and you attach a GRE to the upstream region of that gene. When cells containing the DNA that has been engineered in this way are exposed to glucocorticoids, what happens?
a) The knolin gene is not expressed. b) The knolin gene is expressed as transcription of knolin mRNA from the gene is initiated. c) Transcription of knolin mRNA from the gene is initiated. d) Translation of the glucocorticoid receptor gene is initiated.
In E. coli, genes make up ______ of the DNA.
A) less than 5% B) at least 10% C) at least 50% D) at least 90% E) 100%