People at greatest risk for pneumococcal infections include all the following except
A. those with underlying lung disease and viral infections.
B. adolescents and young adults.
C. patients without a spleen.
D. young infants.
E. the elderly.
Answer: B
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The selective medium, thiosulfate citrate bile salts sucrose (TCBS) agar, is especially formulated for isolating what pathogen from stool cultures?
a. Vibrio b. Salmonella c. Shigella d. Plesiomonas
The climax community ____
a. is formed by species with the greatest range of environmental tolerance b. is the most common community found in an area c. changes over time d. is well adapted to the climate and persists until the climate changes e. is seasonal
During which stage of meiosis do the sister chromatids separate?
a. metaphase I b. anaphase I c. metaphase II d. anaphase II e. telophase II
Thirty people are selected for a long-term mission to colonize a planet many light-years away from Earth. The mission is successful, and the population rapidly grows to several hundred individuals. However, certain genetic diseases are unusually common
in this group, and the group's gene pool is quite different from that of the Earth population they have left behind. Which of the following phenomena has left its mark on this population? A) founder effect B) bottleneck effect C) high rates of mutation D) natural selection