Respiratory syncytial virus is one of the most common etiologic agents of lower respiratory tract infection among:
a. previously healthy patients 2 months to 5 years of age.
b. adults younger than 30 years of age.
c. community-acquired pneumonia in adults.
d. school-age children.
A
Community-acquired pneumonia is a common and potentially serious infection that afflicts children. Among previously healthy patients 2 months to 5 years of age, respiratory syncytial virus, human metapneumovirus, parainfluenza, influenza, and adenoviruses are the most common etiologic agents of lower respiratory tract disease.
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Males tend to be affected in greater numbers by X-linked recessive genetic disorders than are females because
a. females have two dominant genes for the disorder. b. males have only one X chromosome. c. males have a double dose of the gene. d. Y chromosomes are not as strong as X chromosomes. e. females have only one X chromosome.
The last known population of Neanderthals lived as recently as ____ years ago
a. 8,000 b. 18,000 c. 28,000 d. 38,000 e. 48,000
The nervous system is produced by
a. the ectoderm. b. the endoderm. c. the mesoderm. d. the endoderm and ectoderm. e. all of the germ layers.
Describe "historical exposure" (also known as historical contingency) and how it applies to the human microbiome.
What will be an ideal response?