A large number of people in a community experience diarrhea with fever. Public health authorities investigate and find that the people are passing dark urine, and some have yellowish skin. Furthermore, all of the affected individuals recently ate at a
new restaurant in town known for its wide variety of fresh imported vegetables. Which of the following is the most likely causative agent?
A) Escherichia coli O157:H7
B) Salmonella enterica
C) hepatitis A virus
D) hepatitis E virus
E) norovirus
C
Bloom's Taxonomy: Application
Section: Viral Diseases of the Digestive System
Learning Outcome: 23.20
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Stratified epithelium is typically used for
a. protection. b. secretion. c. absorption. d. excretion. e. reproduction.
Imagine that you are conducting an experiment on an enzyme known as sucrase. This enzyme is synthesized and used by yeast cells to break down the disaccharide sucrose (table sugar) into the monosaccharides glucose and fructose
You decide to conduct an experiment to test whether the sucrase enzyme can break down the artificial sweetener sucralose. Sucralose (a "chlorinated" carbohydrate) has some chemical similarity to sucrose, but is different in that three of its hydroxyl groups are missing and replaced with chlorine atoms instead. Based on the details provided in this scenario, do you think the sucrase enzyme will be able to interact with sucralose? A) Yes; enzymes such as sucrase are not specific for their substrate. B) Yes; the enzymes in human cells can interact with artificial sweeteners as if they were sugars. C) No; sucralose is an ion and not a true carbohydrate. D) No; all enzymes are highly specific and can react with only a specific substrate.
If you are in an airplane encountering turbulence and you start feeling sick to your stomach, would closing your eyes be a good thing to try? Why is the maneuver thought to have the effect it has?
What will be an ideal response?
Which type of cell would have the hardest time exporting waste?
A. long and wide B. large and round C. irregular and long D. smooth and cuboidal