The ____ biome is found in states such as Iowa, Minnesota, Nebraska, and other Midwestern states, and is
characterized by thick, rich soils, and a thick mat of sod.
a. savannah
b. tallgrass prairie
c. taiga
d. temperate deciduous forest
e. chaparral
b
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What type of interaction is directly responsible for the formation of secondary structure?
A) peptide bonds between adjacent amino acids B) peptide bonds between nonadjacent amino acids C) hydrogen bonds between sections of the polypeptide backbone D) hydrogen bonds between side chains of amino acids
A ________ is a noncellular infectious agent with a protein coat wrapped around genetic material
a. vector b. virus c. viroid d. prion e. bacteriophage
One of the most significant steps in the evolution of true cells from macromolecular assemblages was the evolutionof:a
electronegativity. b. covalent bonding. c. hydrogen bonding. d. valence electrons. e. molecular reproduction
What percentage of species listed under the U.S. Endangered Species Act are threatened because of competition, predation, parasitism, and herbivory by introduced species?
A) 5% B) 10% C) 20% D) 40% E) 100%