Negative mycobacterial cultures are reported final and the cultures are discarded after what period?
a. 7 days
b. 2 weeks
c. 4 weeks
d. 8 weeks
D
Most isolates appear between 3 and 6 weeks; a few isolates appear after 7 or 8 weeks of incuba-tion. After 8 weeks of incubation, negative cultures (i.e., those showing no growth) are reported and the cultures are discarded.
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You observe a sunflower that moves its leaves so that it tracks the sun across the sky through the day, and a sensitive
plant that reversibly folds up its leaflets when you touch it. These are both examples of ____.
a. phototropism b. thigmotropism c. stress responses d. circadian rhythms e. nastic movements
Who believed that once a mature community was established, its species composition was at equilibrium?
a. Clements b. Gleason c. Darwin d. Whittaker e. Connell
What hormone promotes apical dominance in plants?
a. abscisic acid b. auxin c. cytokinin d. ethylene e. gibberellin
A fungal ________ is light enough to be carried for miles in the wind, dispersing the fungus to new areas.
Fill in the blank(s) with the appropriate word(s).