A 26-year old woman, eight months pregnant, visits her obstetrician complaining of fever, myalagia and back ache of recent onset. Three weeks earlier, the patient had been a weekend guest at a rural farm-house, where all the food was reported to be "unprocessed" and "natural." A culture of the patient's blood shows listeria. What is the most likely source of the woman's infection?
A. well-done roast beef
B. fresh, raw cow's milk
C. home-baked bread
D. homemade apply sauce
E. baked apple pie
Ans: B. fresh, raw cow's milk
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In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?
A. When you sliced the brain, you disconnected the cell from its dendrites. B. Neurons are not electrically active -- you should be recording neuroglia instead. C. When you sliced the brain, you disconnected the cell from its neuroglia. D. Excessive myelination is blocking inputs to the cell. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about neuronal signaling? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
In the following pedigree, the indicated trait is most likely caused by which type of allele?
A) autosomal recessive
B) autosomal dominant
C) X-linked recessive
D) X-linked dominant
E) Y-linked
What would be the most likely outcome if the genetic code was not degenerate?
A. The effect of some mutations would increase. B. The effect of some mutations would decrease. C. The number of stop codons would increase. D. The mutation rate would remain the same.
A transplant patient on a follow-up visit to his physician is noted to have progressive fibrosis and scarring with narrowing of the vessels leading to the transplanted organ. What type of rejection is occurring?
A. Hyperacute B. Acute C. Chronic D. Accelerated