A hybrid zone is properly defined as _____
A) an area where the ranges of two closely related species overlap, but do not interbreed
B) an area where mating occurs between members of two closely related species, producing viable offspring
C) a zone where sterile hybrids form, kept separate by postzygotic barriers
D) an area where members of two closely related species intermingle, but gene flow is prevented by prezygotic barriers
B
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With regard to cancer cells in the process of metastasis to secondary sites, which of the following statements is not correct?
A) If they enter via lymphatics, cancer cells may multiply in regional lymph nodes. B) Many cells from the primary mass may enter circulation. C) The population of cancer cells in the bloodstream is monoclonal. D) Very few cancer cells survive the bloodstream. E) The population of cancer cells is heterogeneous.
Does the empirical formula for carbohydrates convey any structural information?
a. It may convey structural information for ringed carbohydrates. b. No. c. It may convey structural information for branching chained carbohydrates. d. None of the above.
Most monocots have numerous ____ roots
arising from the stem.
a. adventitious b. primary c. fibrous d. secondary e. tap
The codons UCU, UCC, UCA, and UCG all code for the same amino acid, serine. In which position of the codon are mutations most likely to be found when comparing the same gene of two closely related species?
A. position 1 B. position 2 C. position 3 D. none of the positions; any change will be lethal.