The sex-determining chromosomes of a human male are the
A) Z and Z chromosomes.
B) Y and Z chromosomes.
C) X and Y chromosomes.
D) Y and Y chromosomes.
E) X and X chromosomes.
C
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a. is an imperfect fungus that traps nematodes b. infects skeletal muscle cells of AIDS patients c. causes diarrhea in people who drink impure water d. infects the skin of frogs
Which statement is true for most steroid hormones?
a. They dissolve readily in the blood. b. They have no trouble entering their target cells. c. They find and react with surface receptor molecules. d. They cannot easily enter a target cell. e. They developed from amino acids.
Sensory receptors:a
produce internal environmental stimuli. b. convert stimulus energy to electrical energy. c. maintain a constantly hyperpolarized plasma membrane. d. produce a small amount of energy on a continual basis. e. produce action potentials of varying amplitudes in response to stimuli of differing intensities.
The main role of the liver is to ________
A) absorb nutrients B) absorb water C) produce bile, which helps the process of digestion D) break large food into smaller food bits