Duchenne muscular dystrophy and Becker's muscular dystrophy are caused by different mutations in the same X-linked
gene.
a. True
b. False
True
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What feature, among living animals, is completely unique to birds?
a. Laying amniotic eggs b. Four chambered heart c. The ability to fly d. Feathers e. Making a nest for rearing the offspring
Which hypothesis was tested by Warren and Marshall during their research involving Helicobacter pylori bacteria and stomach ulcers?
A) Eating spicy food increases populations of H. pylori in the stomachs of people susceptible to ulcers. B) The cause of many stomach ulcers is the bacterium H. pylori, not spicy food. C) Stomach acid production is decreased by H. pylori bacteria in the stomachs of people with ulcers. D) Acute stomach pain is often caused by H. pylori bacteria, not ulcers.
The molecules that recruit cadherins to the sites of junction formation are called
a. catenins. b. plectins. c. nectins. d. vinculins.
One summer, bird watchers and zookeepers in a major city notice that more birds than usual are dying. At the same time reports of human encephalitis cases increase sharply. The cerebrospinal fluid of human patients is clear. Similar enveloped RNA virus
particles are detected in samples from both birds and humans. Which of the following might be responsible for this outbreak? A) an arbovirus B) coxsackie A virus C) Cryptococcus neoformans D) Neisseria meningitidis E) rabies virus