The most common etiologic agent of community-acquired pneumonia in adults older than 30 years of age is ___ pneumoniae
a. Mycoplasma
b. Chlamydophila
c. Streptococcus
d. Klebsiella
C
The most common etiologic agent of lower respiratory tract infection among adults younger than 30 years of age is M. pneumoniae, which is transmitted via close contact. Regardless of age or coexisting illness, S. pneumoniae is most prevalent, causing 15% to 80% of all communi-ty-acquired bacterial pneumonia.
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During in vitro fertilization, the fertilized egg ____
a. is enucleated and fused with a donor egg b. develops in a Petri dish to form an embryo containing 64 to 128 cells c. develops in a Petri dish to form an embryo containing four to eight cells d. develops in the host animal and eventually results in a clone born to the host e. undergoes a second fertilization with a donor animal's sperm
If a pedigree of several generations shows only females affected by a particular trait, what can be ruled
out? A. Autosomal recessive inheritance D. X-linked recessive inheritance B. X-linked dominant inheritance E. None of these can be ruled out C. Y-linked inheritance
Which group of protists are unicellular, biflagellate stramenopiles that forms a significant portion of the
nanoplankton? a. ciliates b. red algae c. golden algae d. foraminifera e. brown algae
In areas that have a stable population, the number of children born in a period of time is
A) decreasing. B) lower than the number of adults. C) higher than the number of adults. D) increasing. E) approximately equal to the number of adults.