A home-schooled child recently visited an ailing great-grandparent who was complaining of a painful rash. Even though the child had had no contact with children suffering from chickenpox, the child developed chickenpox. How did the child contract the infection?
A. The virus was likely contracted from fomites.
B. The adult had chickenpox and exposed the child.
C. An insect vector infected the child.
D. The adult had shingles and the child was exposed to virus particles.
E. There is insufficient information for a conclusion.
Answer: D
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A. pulmonary vein B. aorta C. vena cava D. pulmonary artery E. All of these carry deoxygenated blood.
Which of the following represents an abundant element found in living organisms?
A. calcium. B. iron. C. iodine. D. hydrogen. E. sodium.
Which of the following body systems is located in only one cavity of the body?
A. immune system B. muscular system C. cardiovascular system D. skeletal system E. urinary system
An individual would develop cystic fibrosis if
he carries ____ mutated CFTR gene(s).
a. 1 b. 2 c. 3 d. 4 e. 5