An example of a mutagen that integrates into the double-helix of DNA resulting in the inhibition of DNA replication would be
A. EMS
B. Nitrous acid
C. 5BU
D. 2-amino purine
E. Acridine dyes
E
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The initial response to a stimulus involves which process?
a. perception b. integration c. interpretation d. reception e. sensation
Opercula are
A. extensions of the body wall in polychaete worms. B. gill covers on a fish. C. internal spaces in a planarian used in digestion and respiration. D. gills on a lobster. E. tentacles on a hydra.
Why do karyotypes always show chromosomes at the point when cell division is about to occur?
A) The chromosomes are easier to see when they are elongated and uncondensed. B) This is the time at which the chromosomes are being duplicated. C) This is the only cell cycle point in which the chromosomes are unduplicated. D) The chromosomes are fully condensed as cell division approaches.
HIV/AIDS and tuberculosis are both examples of current
A. outbreaks. B. epidemics. C. acute infections. D. opportunistic infections. E. pandemics.