How is life defined?
A. Life is determined by neural activity.
B. The only requirement for life is the ability to reproduce.
C. Life is defined through a set of shared characteristics that all living things display.
D. A living thing must be able to move.
Answer: C
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(a) chemoreceptors. (b) stretch receptors. (c) centers in the brain stem. (d) all of the above.
The constant region of an antibody molecule is
A) the binding site for antigens. B) part of the heavy chains only. C) similar in all antibody molecules. D) the binding site for two antigens.
Which of the following is the single most effective action a person can take to help prevent atherosclerosis?
A. Control high blood pressure. B. Eat a diet low in cholesterol. C. Eat a diet low in saturated fat. D. Stop smoking.
Which of the following is a complication that may result from a Streptococcus pyogenes skin infection?
A) a carbuncle B) a sty C) shingles D) scalded skin syndrome E) erysipelas