Which of the following areas has not been identified by Conservation International as in need of additional sanctuaries?
A. Madagascar
B. Alaska
C. Papua New Guinea
D. Brazil's Atlantic rainforest
E. Noneoftheabove
Ans: B. Alaska
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The dose of an antigen that kills 50% of animals in a test group and is used to estimate the virulence of a pathogen is known as
A) Antigen dose50. B) Virulence-50. C) LD50 (lethal dose50). D) Death rate-50.
What aspect of chromosome behavior most clearly accounts for Mendel's law of segregation?
A) movement of sister chromatids to opposite poles at anaphase II of meiosis B) movement of homologous chromosomes to opposite poles at anaphase I of meiosis C) crossing-over between homologous chromosomes during prophase I of meiosis D) replication of chromosomes prior to meiosis E) independent alignment of different homologous pairs on the metaphase I spindle
What does a karyotype reveal about chromosomes found in actively dividing cells?
What will be an ideal response?
Triclosan, a common ingredient in antimicrobial hand soaps available to consumers, has recently been banned by the FDA (Food and Drug Administration). All of the following are concerns regarding the use of triclosan, except
A. Wide spread regular use of triclosan could interfere with the maintenance of healthy normal microbiota. B. These are all concerns that have been expressed about triclosan use. There are no exceptions here. C. There are concerns that triclosan may be a hormone disruptor. D. Wide spread use of triclosan may favor the survival and growth and of highly resistant bacteria. E. Scientific evidence does not demonstrate that triclosan-supplemented soaps are any more effective than plain soap and water for hand hygiene.