Best answer for the question 2. Which of the following DNA extraction methods involves a commercially available styrene polymer resin that binds metal ions
O A. Organic extraction
OB. EDTA extraction
OC. Chelex extraction
O D. Phenol-chloroform extraction

The correct answer is - C. Chelex extraction.

Explanation:

Chelex extraction is a DNA extraction method that involves a Chelex100 chelating resin that prevents DNA degradation by traping the degradative enzymes and from potential contaminants.

In absence of this Chelex resin, a styrene polymer resin that binds metal ions that might inhibit downstream analyses. This process involves a commercially used Chelex 100 which is a styrene-divinylbenzene copolymer that has paired iminodiacetate ions, which act as chelating groups in binds metal ions.