The dominant Huntington disease allele causes severe neural/brain damage at approximately age 40. A female whose mother has Huntington disease marries a male whose parents are normal. It is not known if the female has the disease. Keeping in mind that the disease allele is rare in the population, what is the probability that their firstborn will inherit the gene that causes Huntington disease?
A) 25%
B) 50%
C) 75%
D) 100%
E) 0%
A) 25%
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Which one of the following initiates signal termination?
A. the shutdown of transcription B. the release of signal molecules from their receptors C. the shutdown of translation D. the reduction of signal amplification
A scientific investigation follows an orderly progression of steps-select the correct path
a. Test hypothesis, collect and interpret data, determine conclusions. b. Make observations, formulate hypothesis, test hypothesis. c. Make observations, formulate hypothesis, test hypothesis, collect and interpret data, draw conclusion. d. Consult literature, test hypothesis, collect data, interpret data, draw conclusion. e. Make observations, consult literature, interpret data, formulate and test hypothesis.
In the microarray shown in your book, the cDNAs were labeled with red and green fluorescent tags
How then do you end up with spots on the microarray emitting yellow light?
a. In light, red and green are two of the primary colors, and the combination of the two will produce yellow light. b. The yellow light comes from the laser, and a yellow spot indicates that neither cDNA hybridized to that spot on the microarray. c. The over expression of one cDNA relative to the other will skew the color pattern of the spot on the microarray. This result in the yellow color. d. The color choice was an arbitrary decision by the artist and doesn't reflect how the process actually works. e. Yellow spots are those that contain no DNA probes on the chip.
Cigarette smoking can sometimes lead to development of a "smoker's cough," which results from paralysis of cilia in the airways. Why would the paralysis of cilia lead to smoker's cough?
A) Paralyzed cilia can no longer clear the airways of mucus, so coughing helps remove it. B) Paralyzed cilia can no longer provide an immune response to protect the airways from harmful compounds in the smoke, so coughing is used to try to prevent the compounds from damaging the airways. C) Paralyzed cilia lead to a nervous response that "tickles" the airways and induces coughing. D) Paralyzed cilia push mucus downward into the alveoli, which coughing attempts to remove.