Question

why is it important to keep the filtrate and reagents cold?
cold temperature lyses membranes.
cold temperature homogenizes dna.
cold temperature stabilizes dna.

Explanation:

Cold temperatures help to stabilize DNA by reducing the activity of enzymes that could degrade it and minimizing molecular motion that might disrupt its structure. Cold does not lyse membranes (that is typically done by detergents or mechanical force) and does not homogenize DNA (homogenization is a mechanical process to break up tissue).

Answer:

Cold temperature stabilizes DNA.