A 36-year-old woman is on a cruise ship and later develops nausea, abdominal pain, vomiting, and diarrhea. She is most likely suffering from which virus?
a. Norovirus
b. Rotavirus
c. Coronavirus
d. Torovirus
A
Norovirus is the source for more than 80% of nonbacterial acute gastroenteritis and more than 50% of food-borne outbreaks for all ages in developed and underdeveloped countries. Of major public health concern is its ability to cause large outbreaks in semiclosed environments. In recent years, noroviruses have been implicated in large outbreaks of disease on cruise ships and in nursing homes, schools, summer camps, hospitals, and restaurants.
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Honeybee workers spend their first few weeks as young adults tending the colony's brood, then later shift jobs to foraging for food outside the colony
When researchers fed the young bees candy spiked with the molecule ethyl oleate, the young bees continued to babysit and delayed the job shift to foraging. What would it require to demonstrate that ethyl oleate normally acts as a pheromone, not as an endocrine or paracrine signal? A. It would require demonstration that ethyl oleate binds to a receptor and initiates a series of responses. B. It would require demonstration that ethyl oleate is released by another individual of the same species. C. It would require demonstration that ethyl oleate is released by a predator and causes a behavioral change in the prey.
Erythromcycin, a macrolide, inhibits protein synthesis
A. by preventing the formation of the initiation complex. B. by binding to the tRNA preventing peptide bond formation between amino acids. C. by interfering with both the initiation and elongation stages of translation. D. by binding to the ribosome, preventing translocation due to interference with the attachment of mRNA.
Fertilization of plant gametes produces a
a. zygote. b. gametophyte. c. spore. d. meiospore. e. multicellular haploid plant.
Which of the following layers of the human eye contains the photoreceptors?