Sanitary landfill
What will be an ideal response?
disposal site for non-hazardous solid waste that is spread in layers and compacted tot he smallest practical volume. The sites are typically designed with floors made of materials to treat seeping liquids and are covered by soil as the wastes are compacted and deposited into the landfill
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Which of the following are ways that usable
nitrogen is removed from the soil? a. nitrification b. leaching c. nitrogen fixation d. ammonification e. all of these
In a fish population in a shallow stream, the genotypic frequency of yellowish-brown fish and greenish-brown fish changed significantly after a flash flood randomly swept away individuals from that stream. This change in genotypic frequency is most likely attributable to
a) gene flow b) disruptive selection c) directional selection d) genetic drift e) natural selection
Identical copies of genes that can be transcribed simultaneously are called
A. pseudogenes. B. expressed sequences. C. tandem clusters. D. multigene families. E. segmental duplications.
Of the following, a receptor protein in a membrane that recognizes a chemical signal is most similar to
A) the active site of an allosteric enzyme that binds to a specific substrate. B) tRNA specifying which amino acids are in a polypeptide. C) a metabolic pathway operating within a specific organelle. D) an enzyme having an optimum pH and temperature for activity. E) an antibody in the immune system