Which of the following describes the entropy change of a gas reaction? A. If there is an increase in the number of gas molecules, then AS = 0.
B. The change in entropy cannot be predicted in a gas reaction.
C. If there is an increase in the number of gas molecules, then AS> 0.
O D. If there is an increase in the number of gas molecules, then AS<0.

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?