Cultures of a bacterial strain were incubated in a standard incubator, in an anaerobic jar, and in a candle jar. After incubation, there was moderate growth of cultures in the candle and anaerobic jars, but heavy growth of the culture in the incubator. This species is a(n) ________.
A. facultative anaerobe
B. obligate aerobe
C. anaerobe
D. microaerophile
E. capnophile
Answer: A
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The mercury in fish is normally in the form of elemental mercury (Hg0)
Indicate whether the statement is true or false.
In the microarray shown in the textbook, the cDNAs were labeled with red and green fluorescent tags. Why do some
spots on the microarray emit yellow light?
a. Red and green are two of the primary colors, and if both cDNAs hybridize to the spot, 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, resulting 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.
Which of the following is least likely to be a
cause of extinction? a. asteroid impact b. human activity c. adaptive radiation d. continental drift e. climate change
Fusion of a cancer cell and a normal cell using polyethylene glycol yields a hybrid cell that behaves like a normal cell because
A) of recombination between cancer cell and normal cell chromosomes. B) of dilution of carcinogens in the hybrid cell cytoplasm. C) of the presence of normal cell tumor suppressor genes and gene products in the hybrid cell. D) exposure to polyethylene glycol inhibits expression of oncogenes. E) the normal cell DNA repair machinery reverses all cancer cell gene mutations.