The typical lesion of primary syphilis is
A. purulent sore throat.
B. a generalized rash.
C. the development of buboes in the lymph nodes at the site of infection.
D. a painless reddened lesion called a chancre at the site of infection.
E. gummas in bones, in nervous tissues, or on the skin.
Answer: D
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Indicate whether the statement is true or false.
Chlorofluorocarbons (CFCs) are pollutants because ____
a. they do not break down easily b. they combine with water to form hydrochloric and hydrofluoric acids c. they are found in smog d. they are photochemical oxidants e. they combine with carbon dioxide to form acid rain
By restricting the traffic of proteins and RNA across the nuclear envelope, eukaryotic cells can regulate
a. translation. b. transcription. c. endocytosis. d. nuclear pH.
Taking this exam might have caused your adrenal cortex to produce cortisol, the most common glucocorticoid. Cortisol is usually produced in response to
A) a drop in blood pressure. B) the release of adrenaline. C) increased brain activity. D) stress or anxiety. E) inactivity.