The phylogenetic trees of the nifH and SSU rRNA genes are incongruent because
A) nitrogenase is an anaerobic enzyme.
B) nitrogenase evolves rapidly.
C) of horizontal gene transfer.
D) very few microbes have the nifH gene.
Answer: C
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Which of these is a +/+ interaction?
A. competition B. mutualism C. commensalism D. parasitism E. competition and parasitism
Which of the following correctly lists organization levels from the simplest to the most complex?
a. atoms, organelles, cells, tissues, organs b. atoms, molecules, tissues, organelles, organisms c. molecules, atoms, cells, organelles, tissues d. molecules, cells, organelles, organisms, organs
Which of the following represents the possible genotype(s) resulting from a cross between two individuals that are
heterozygous (Bb)? a. BB and Bb b. BB, Bb, and bb c. BB only d. Bb only e. bb only
In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the heterozygote. If a long radish is crossed with a round radish, which of the following phenotypic ratios of the F2 generation is correct?
A. all round B. all oval C. 1/2 long, 1/2 oval D. 1 long, 2 oval, 1 round E. 1/2 oval, 1/2 round