Which of the following statements regarding the role of protein A in the pathogenesis of infections caused by Staphylococcus aureus is correct?
A. It is responsible for the rash in toxic shock syndrome.
B. It is directly responsible for lysis of neutrophils.
C. It is a bacterial surface protein that binds to the Fc portion of IgG.
D. It converts hydrogen peroxide into water and oxygen.
E. It is a potent enterotoxin.
Ans: C. It is a bacterial surface protein that binds to the Fc portion of IgG.
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A gram-negative, oxidase-positive diplococcus growing on chocolate agar likely belongs to the genus
A) Neisseria. B) Escherichia. C) Mycobacterium. D) Pseudomonas.
The best definition for genotype-environment interactions is
A. Environmental effects on the phenotype differ with genotype B. Environment does not affect phenotype. C. Phenotypes will always be affected by the environment no matter what the genotype D. Genotypes and phenotypes do not change with environmental conditions
A patient has a problem with semilunar valve function. You would expect to observe
A. backflow of blood from the arteries leaving the heart into the ventricles. B. backflow of blood from the veins leaving the heart into the ventricles. C. backflow of blood into large veins. D. backflow of blood from the ventricles into the veins leaving the heart. E. backflow of blood from entering the arteries.
A collection of related hypotheses that have been shown to be true after extensive testing can be collectively called a ________.
Fill in the blank(s) with the appropriate word(s).