Cell-to-cell communication by quorum sensing has been shown to be important in the regulation of genes needed for
A. biofilm production.
B. plasmid transfer.
C. virulence.
D. All of the choices are correct.
Answer: D
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Mendel used the ______ to determine whether an individual with the dominant phenotype was homozygous or heterozygous for that trait.
A. backcross B. testcross C. dihybrid cross D. F2 generation E. double cross
Depending on the particular metabolism of a bacterium, electron transport can be used to energize and rotate ATP synthase
Indicate whether the statement is true or false.
True or false: Some cases of hybridization that lead to instantaneous speciation result in alteration of chromosomal number
A. true B. false
Wheat is a group of grass species. Cultivation originated in the eastern Mediterranean about 10,000 years ago. In comparison to closely related wild grasses, cultivated wheat has shorter stalks and fewer, larger seeds that are firmly attached to the stalk
(e.g., they don't blow away in the wind). How do these changes affect the evolutionary fitness of wheat? A. Fitness is increased because the dispersal of embryos is reduced. B. Fitness is increased because the dispersal is limited. C. Fitness is decreased because more energy is devoted to trying to grow longer stalks. D. Fitness is decreased because the seeds are not dispersed.