Which of the following gives the correct rank order for relative amount of water (most to least) required for excretion of the primary nitrogenous wastes used by different animals?
A. ammonia ? urea ? uric acid
B. uric acid ? ammonia ? urea
C. urea ? uric acid ? ammonia
D. ammonia ? uric acid ? urea
E. urea ? ammonia ? uric acid
A. ammonia ? urea ? uric acid
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Which of the following performs a chemical digestion similar to that done by pepsin?
a. aminopeptidase b. carboxypeptidase c. trypsin d. gastrin e. lecithin
The type of movement that is specific and requires carrier molecules and energy is
A. active transport. B. exocytosis. C. facilitated diffusion. D. osmosis. E. endocytosis.
Which of the following explains the events occurring when water boils?
a. Hydrogen bonds are broken between neighboring water molecules. b. Covalent bonds are broken between oxygen and hydrogen atoms. c. Ionic bonds are broken when the minerals in water are heated. d. The bond between one water molecule and another is strengthened. e. The hydrogen atoms break away from the oxygen and escape as vapor.
Which of the following are examples of innate immunity? 1. stomach pH 2. natural killer cells 3. B lymphocytes 4. fever
A) 1 and 2 only B) 2, 3, and 4 only C) 1, 3, and 4 only D) 1, 2, and 4 only