The interaction in which one species benefits and the second species is neither harmed nor benefited is ____
a. mutualism
b. parasitism
c. commensalism
d. competition
e. predation
ANSWER: c
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The activity of adenyl cyclase is influenced by
A. the presence of lactose in the environment. B. the phosphotransferase system. C. homoserine lactones. D. None of the choices are correct.
A variety of E. coli clones have been isolated, and the DNA has been extracted, digested with restriction enzymes, denatured, separated by gel electrophoresis, and transferred to nylon membrane by the Southern blot procedure. A radioactive probe is used that hybridizes with a gene of interest. The DNA corresponding to a single clone yields a single DNA band after probing the blot. Based on this
information only, A) all of the clones tested, except the one described, have the gene of interest. B) only the one clone described has the gene of interest. C) the gene of interest is located entirely on the DNA band visualized. D) the part of the gene recognized by the probe is located on the DNA band visualized. E) both choices B and D
Which of the following contribute to both
leaching and soil erosion? a. strong winds b. mineral composition of soil c. moving water d. climate e. none of these
Trait SpeciesABCDE100100210101310101411100511110611110The table shows the distribution of traits (A-E) in six extant species (1-6). A "0" indicates the ancestral condition, and a "1" indicates the derived condition. Which pair of species shares the fewest number of derived characters (synapomorphies)?
A. 6 and 3 B. 1 and 6 C. 4 and 6 D. 1 and 4 E. 2 and 3