Triclosan is a phenolic compound present in some hand sanitizers that targets a specific protein mediating fatty acid synthesis. Are microbes more or less likely to develop resistance to triclosan than to alcohol?
A. More likely, since we use more triclosan overall than alcohol.
B. Less likely, since we use more alcohol overall than triclosan.
C. More likely, since triclosan has a specific target which can be altered genetically, whereas alcohol's surfactant properties cannot be avoided.
D. Less likely, since the cell membrane structure can be altered genetically to resist the surfactant properties of alcohol, whereas triclosan kills the cell outright.
C. More likely, since triclosan has a specific target which can be altered genetically, whereas alcohol's surfactant properties cannot be avoided.
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In an XX embryo, ____ inactivation of one X chromosome usually occurs when the embryo has about 32 cells
a. phenotypic b. inhibited c. cascading d. selective e. random
Nitric oxide in the exhaust of cars and trucks results in
a. photochemical smog. b. industrial smog. c. a thermal inversion. d. none of these. e. all of these.
Nociceptors:a
may be thermal, mechanical, or even chemical. b. always result in the perception of pain. c. transmit signals directly to interneurons in the brain when stimulated. d. are immune to sensitization. e. are insensitive to endogenous opiates, but can be suppressed by synthetic forms.
Hamilton explained the origin of altruism in selected insect societies with his kin selection model of sex determination. Since males are haploid and females are diploid, the workers share a very high proportion of alleles, theoretically as high as 75%. What is this called?
A. Haplodiploidy B. Haploidy C. Diploidy D. Parthenogenesis E. Altruism