Question

In gel electrophoresis, how is DNA cut into smaller pieces?

scissors

restriction enzymes

lasers

Answer 1

Answer:

restriction enzymes. Gel electrophoresis is a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells (indentations) at one end of a gel, and an electric current is applied to pull them through the gel. DNA fragments are negatively charged, so they move towards the positive electrode.

Answer 2

Answer:

Restriction enzymes

Explanation:

Restriction endonucleases cut DNA at a particular point by recognizing a specific sequence of base pairs. The cutting of DNA by restriction endonucleases results in fragments of DNA that can be separated by a technique known as gel electrophoresis.

In gel electrophoresis, negatively charged DNA fragments move towards the positively charged anode under an electric field through a medium. The DNA fragments separate according to their size as they pass through the pores of the medium, with smaller fragments moving farther.

Thus, restriction enzymes are used to cut DNA into fragments, while gel electrophoresis is used to separate and isolate those fragments.