The three main forms of nitrogenous wastes found in animals are
A. ammonia, urea, and uric acid.
B. ammonia, urea, and uracil.
C. ammonia, urea, and amino acids.
D. uracil, urea, and uric acid.
E. amino acids, uracil, and uric acid.
A. ammonia, urea, and uric acid.
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A cell that responds to an environmental condition by the release of a chemical is an example of which of the following elements of cellular communication?
A. a signaling cell B. a signaling molecule C. a receptor molecule D. a responding cell E. None of these choices is correct.
What is the sticky female region of a flower that is specialized for receiving pollen?
a. stamen b. stigma c. anther d. ovary e. endosperm
The first jawless fishes evolved by about ____ million years ago
a. 120 b. 270 c. 380 d. 480 e. 650
Water is important to the interactions of
biological molecules because it a. promotes hydrophobic and hydrophilic interactions. b. stabilizes temperature. c. is an excellent solvent for polar and ionic substances. d. has strong cohesive properties. e. does all of these.