What conditions result in the release of cAMP from Dictyostelium discoideum?
A. Adequate moisture
B. Presence of predatory bacteria
C. Shortage of nutrients
D. Abundance of nutrients
Answer: C
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To measure the population of lake trout in a 250-hectare lake, 400 individual trout were netted and marked with a fin clip, then returned to the lake
The next week, the lake was netted again, and out of the 200 lake trout that were caught, 50 had fin clips. Using the mark-recapture estimate, the lake trout population size could be closest to which of the following? A) 160 B) 200 C) 400 D) 1,600 E) 80,000
The presence of specific ________ signals that a given water source might be contaminated with pathogens
A) exotoxins B) chemical compounds C) endotoxins D) indicator microorganisms
Which of the following human sex chromosome genotypes is not possible?
a. Y_ b. XXY c. XY d. X_ e. XX
In light of the phylogenetic evidence that feathers evolved prior to flight, what might have been the original function of feathers?
a. heat retention b. facilitating tactile sensation c. waterproofing d. shielding from sunlight e. All of the above