To increase the density of a sample relative to the density of the buffer prior to loading the sample into a gel, which of the following is added to the sample?

Question

Quizplus · Accepted Answer

Glycerol is a common additive used to increase the density of a sample relative to the density of the buffer. This allows the sample to sink into the gel rather than float on top. Ethidium bromide is a stain used to visualize DNA, formaldehyde is a crosslinker used in protein assays, and Tris acetate EDTA is a buffer used in electrophoresis. None of these would have a significant impact on the density of the sample.

To Increase the Density of a Sample Relative to the Density