The difference between the terms pathogenicity and virulence is that
A. pathogens cause disease and their virulence describes the degree of pathogenicity.
B. virulent organisms cause disease and their pathogenicity describes the degree of disease manifestations.
C. virulent organisms cause disease, pathogens do not.
D. pathogenic organisms cause disease, virulent organisms do not.
Answer: A
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_____ are the main male hormones.
Fill in the blank(s) with the appropriate word(s).
A tube coagulase test was performed on catalase-positive, gram-positive cocci that were ?-hemolytic and grew on mannitol salt agar. The tube was checked after overnight incubation and was negative. Which of the following statements explains this discrepancy?
a. A tube coagulase should not be performed on a catalase-positive organism. b. A ?-hemolytic colony, which is catalase positive and grows on mannitol salt, is normally coagulase negative. c. The test should have been read in 1 to 4 hours in case any hemolysins are present. d. No discrepancy is present; the results are accurate.
Pure water has a pH of 7.0, therefore, ____
a. [H+] < [OH-] b. [H+] = [OH-] c. [H+] = 0 d. [OH-] = 0 e. [H+] > [OH-]
The ____ contain(s) oxygen-poor blood
a. left ventricle b. left atrium c. aorta d. pulmonary arteries e. pulmonary veins