Describe two common DNA extraction methods and one key advantage of each?

Describe two common DNA extraction methods and one key advantage of each?

• A. Organic extraction (phenol-chloroform) yields high-purity DNA; silica-based column extraction is fast and automation-friendly
• B. Liquid-liquid extraction; heating-only extraction
• C. Direct lysis without purification; precipitation-based
• D. Magnetic bead extraction with low yield; solvent-based extraction with high yield

Answer: (A)

Two widely used DNA extraction methods are organic extraction using phenol-chloroform and silica-based column extraction. Organic extraction's key advantage is yielding very high-purity DNA by effectively removing proteins and contaminants into the organic phase, which is especially helpful for sensitive downstream analyses. Silica-based column extraction's key advantage is speed and automation compatibility; DNA binds to silica in the presence of chaotropic salts, then is washed and eluted quickly, making it ideal for routine and high-throughput workflows. Other options either describe less common or less reliable approaches or make inaccurate claims about yield, so they don’t describe the typical, practical choices used in forensic labs.

Two widely used DNA extraction methods are organic extraction using phenol-chloroform and silica-based column extraction. Organic extraction's key advantage is yielding very high-purity DNA by effectively removing proteins and contaminants into the organic phase, which is especially helpful for sensitive downstream analyses. Silica-based column extraction's key advantage is speed and automation compatibility; DNA binds to silica in the presence of chaotropic salts, then is washed and eluted quickly, making it ideal for routine and high-throughput workflows. Other options either describe less common or less reliable approaches or make inaccurate claims about yield, so they don’t describe the typical, practical choices used in forensic labs.