What percentage of Earth's productive land is currently used by the human population for crops and livestock?
A) 20% B) 75% C) 40% D) 55% E) 90%
C
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The ribosomal RNA studies that led to the division of prokaryotic organisms into the Bacteria and the Archaea were begun by
A. Watson. B. Pasteur. C. Woese. D. Needham.
In the Hardy-Weinberg equation, the term q2 refers
to the frequency of a. a recessive allele of a given locus. b. the homozygous recessive genotype at a given locus. c. recessive alleles in a population. d. heterozygotes in a population. e. alleles in the gene pool.
In which group of organisms has the timing of spring events changed the most in response to climate change?
A) birds B) butterflies C) amphibians D) trees
Which of the following statements about biological transmission is FALSE?
A) The pathogen reproduces in the vector. B) The pathogen may enter the host in the vector's feces. C) Houseflies are an important vector. D) The pathogen may be injected by the bite of the vector. E) The pathogen may require the vector as a host.