Which of the following has not been an effective treatment for syphilis?

A. Vancomycin
B. Arsenic
C. Penicillin G
D. Mercury


Answer: A

Biology & Microbiology

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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.

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What is the source of sweat glands, hair follicles, and oil glands within the dermis of skin?

a. epithelium b. loose connective tissue c. the dermis d. dense connective tissue e. adipose

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Senescence may be counteracted by

a. removal of old flowers. b. removal of seed pods. c. inhibiting nutrient diversion to fruits. d. all of these. e. none of these.

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Weakened bones, kidney stones, and malfunctioning muscles are symptoms of

a. hyperthyroidism. b. Grave's disease. c. acromegaly. d. hyperparathyroidism. e. Wilson's disease.

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