Question

to separate genomic dna fragments by size, which of these laboratory methods is
spectrophotometry
electrophoresis
titration
filtration

Explanation:

• Spectrophotometry measures light absorption or emission, not used for separating DNA fragments by size.
• Electrophoresis uses an electric field to separate charged molecules (like DNA) through a gel matrix. Smaller DNA fragments move faster through the gel, allowing separation by size.
• Titration is a method to determine the concentration of a substance in a solution, not for size - based separation.
• Filtration separates substances based on particle size but is not the standard method for DNA fragment size separation in a laboratory setting for genomic DNA analysis.

Answer:

Electrophoresis