Which of the following statements about prescribed burns is true? a. Prescribed burns will always have detrimental effects on ecosystems, but should be used to protect homes. B. Prescribed burns are necessary for preventing natural wildfires. C. Prescribed burns can help maintain healthy ecosystems. D. None of the above.

Assume that you are interested in separating short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range. you have two recipes for making your polyacrylamide gels: one recipe uses 1.5 percent agarose and would be considered a “hard gel,” while the other uses 0.5 percent agarose and would be considered a loose gel. which gel should you use to separate the short (200-400 bp) dna molecules from a pool of longer molecules in the 10,000-20,000 nucleotide range?