The arsenic compound that proved highly effective in treating syphilis was called
A. penicillin.
B. sulfa.
C. erythromycin.
D. Salvarsan.
D
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Annual rings in a tree trunk result from
A. deposition of colored materials in the oldest cells. B. the variation in cell size due to different growth conditions throughout a year. C. the alternation of xylem and phloem produced in one year. D. the kinds of cells, parenchyma or sclerenchyma, produced by the cambium. E. the proportion of wood cells and cork cells in the xylem.
The relationship between strands of RNA and
DNA is a. antagonistic. b. opposite. c. complementary. d. an exact duplicate. e. unrelated.
The lack of voluntary control over urination due to the inability to control the external urethral sphincter is called ________
A) urinary incontinence B) renal failure C) urination D) micturition
Adding a fibrinogen inactivator to blood would prevent:a
the formation of thrombin. b. platelet formation. c. the blood from clotting. d. constriction of the blood vessels. e. hemoglobin synthesis.