A student accidentally left a tube of nutrient broth inoculated with E. coli at 20°C for 96 hours and a tube of nutrient broth inoculated with E. coli at 37°C for 96 hours. Which tube would you expect to be in the death phase of its growth curve?
A) The tube incubated at 20°C
B) The tube incubated at 37°C
B) The tube incubated at 37°C
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Which of the following statements is correct in comparing metagenomic (next generation) sequencing to whole-genome (shotgun) sequencing?
A. Both sequencing methods utilize overlapping sequence contigs to assemble the full sequence. B. Whole-genome sequencing does not fragment genomic sequences, but rather utilizes adaptor molecules on the template DNA. C. Both sequencing methods have equal depth and coverage from the polymerase "reads" on the template. D. Metagenomic sequencing uses a bacterial artificial chromosome (BAC) genomic library as the template.
When E. coli cells produce the amino acid tryptophan, a cluster of five genes is transcribed together. This cluster of genes is referred to as the
A. trp transcriptional operator. B. trp regulator. C. trp suppressor. D. trp operon. E. trp promoter.
The major obstacle to the use of xenotransplants can possibly be overcome by ____
a. giving a series of injections that depress the immune systems of recipients b. changing genetic markers in humans to make them more receptive to nonhuman tissue c. cloning donor animals using human DNA d. introducing a complement genes to both the donor animal and recipient human e. altering the patient's MHC complex
Women who have a healthy population of Lactobacillus spp. as part of the normal vaginal microbiota are less likely to get yeast infections. Which of the following terms is used to explain this observation?
A) parasitism B) mutualism C) synergism D) commensalism E) competitive exclusion