All of the following are true of methanogens EXCEPT
A. they live in swamps and marshes.
B. they produce methane from CO2 and H2.
C. they live in the intestinal tracts of cows, humans, and termites.
D. they require hot, acidic environments for methanogenesis.
E. their biogas may contribute to global warming.
Answer: D
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Viruses are sometimes classified by the organisms they infect. In fact, the first virus discovered only infects a particular plant. What was this first known virus?
a. leaf curl virus b. potato gall virus c. tobacco mosaic virus d. Dutch elm disease
Which statement most completely describes why the pea plant was an excellent choice for Mendel's experiments?
a. True-breeding varieties were available. b. The plant can self-fertilize. c. The plant can be cross-fertilized. d. True-breeding varieties were available, and it can be cross-fertilized. e. True-breeding varieties were available, the plant can self-fertilize, and it can be cross-fertilized.
The importance of enzymatic competition is that
A. different end products can be formed at different times when needed. B. it reduces the amount of enzymes in the cell to an optimum. C. it guarantees that all enzymes will form enzyme-substrate complexes. D. no substrates will go unchanged by an enzyme.
Dominance hierarchies minimize aggression in social animals
Indicate whether the statement is true or false