Question

During isolation of genetic material, the chemical used to precipitate out the purified DNA is

• A. Bromophenol blue
• B. Chilled ethanol
• C. Ethidium bromide
• D. Both A and C
  

Answer 1

Answer: (B)

Chilled ethanol

• The purified DNA, after treatment with various enzymes, precipitates out after the addition of chilled ethanol.
• This is viewed as a collection of fine threads in the suspension and is easily collected. The process is known as DNA spooling.

So, the correct answer is 'Chilled ethanol'.