In 1940, two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein that had been previously detected in Rhesus monkeys. This blood type was labeled Rh positive, and Rh+ was found to be dominant over the absence of the blood factor (Rh-). Under normal Mendelian inheritance, which of the following statements is FALSE?
A. An Rh- child would require that both parents be carriers of at least one Rh- gene.
B. Two Rh- parents could have an Rh+ child.
C. It is possible with just one pair of parents to have children where some siblings are Rh- and some are Rh+.
D. Two Rh+ parents could have an Rh- child.
E. All of the choices are false.
Answer: B
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Refer to the figure above (first three rows of the periodic table). What element has properties most similar tocarbon?
A) boron B) silicon C) nitrogen D) aluminum E) phosphorus
What is gross primary production?
A. The carbon fixed during photosynthesis. B. All of the carbon fixation after cellular respiration is accounted for. C. Energy released by both primary and secondary consumers. D. Photosynthetic production plus energy recycled through detritivores. E. None of the answers is correct.
Old cultures of bacteria that have lost their ability to cause disease are said to be
A. pathogenic. B. impotent. C. attenuated. D. virulent.
Under which of the following circumstances would a DNA microarray be useful?
A. It would enable a researcher to determine the differences in gene expression between cell types. B. It would enable doctors to determine which genes are responsible for producing diseased tissue in an individual. C. Researchers are trying to determine if an individual has inherited a genetic disease from their parents. D. All of these are circumstances in which a DNA microarray would be useful. E. None of these are circumstances in which a DNA microarray would be useful.