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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

Which of the following human sex chromosome genotypes is not possible?

a. Y_ b. XXY c. XY d. X_ e. XX

Biology & Microbiology

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

Biology & Microbiology