2025 DNA Structure and Fingerprinting Test 12 of 25 POSSIBLE POINTS 4 in gel electrophoresis, because DNA has a square charge, it travels to the electrode that has a square charge

## Step 1<br />Gel electrophoresis is a technique used to separate DNA molecules based on their size. The DNA molecules are placed in a gel and an electric current is applied. <br /><br />## Step 2<br />DNA molecules are negatively charged due to the phosphate groups in their backbone. This negative charge is due to the presence of phosphate groups in the DNA backbone.<br /><br />## Step 3<br />When an electric current is applied, the negatively charged DNA molecules will be attracted to the positive electrode. This is because opposite charges attract each other.<br /><br />## Step 4<br />Therefore, in gel electrophoresis, DNA travels towards the positive electrode because it has a negative charge.