Question

Gel-electrophoresis unit separates the DNA according to their ______.

• A. Charge
• B. Concentration
• C. pH
• D. Size

Answer 1

The correct option is D Size

• Gel electrophoresis is a technique commonly used in laboratories to separate charged molecules like DNA, RNA, and proteins according to their size.
• In gel electrophoresis, the molecules to be separated are pushed by an electrical field through a gel that contains small pores.
  
• DNA fragments are negatively charged, so they move towards the positive electrode after applying the electric field.
  
• Small size molecules can move faster through these pores than larger molecules.

So the correct answer is option D.