The difference between MDR-TB and XDR-TB is that
A. MDR-TB exhibits resistance to isoniazid and rifampin whereas XDR-TB strains are resistant to bedaquiline.
B. XDR-TB is predominantly seen in the USA whereas MDR-TB is common in India and China.
C. MDR-TB strains are classified as having resistance to two antibiotics, whereas XDR-TB strains are classified when they are resistant to four antibiotics.
D. MDR-TB strains have a higher mortality rate than XDR-TB strains.
Answer: C
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A. K-selected B. r-selected
In Figure 23-2, the pair of organisms that have the most recent ancestor is:
a. 2 and 4.
b. 6 and 4.
c. 4 and 5.
d. 2 and 3.
e. 1 and 2.
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A) on the forest floor. B) in the towering treetops. C) in the shorter trees. D) in the cleared areas. E) in the soil.