Mastering Gel Electrophoresis: Analyzing DNA Fragment Separation Techniques

Gel electrophoresis is a technique used to separate DNA fragments based on size by applying an electrical charge to a gel. DNA, being negatively charged, migrates towards the positive end of the gel, with smaller fragments moving further. A DNA ladder, a set of known DNA fragment sizes, is used to estimate the size of unknown fragments. This process allows for the visualization and analysis of DNA fragments, aiding in size determination and comparison.

What is the primary purpose of gel electrophoresis?

• To clone DNA

• To sequence DNA

• To separate DNA fragments based on size

• To amplify DNA fragments

What charge is applied at the top of the gel during electrophoresis?

• Neutral

• No charge

• Positive

• Negative

Where are DNA fragments initially placed in the gel?

• Randomly throughout the gel

• At the top of the gel

• In the middle of the gel

• At the bottom of the gel

Why do smaller DNA fragments move further in the gel?

• They are less dense

• They are more negatively charged

• They encounter less resistance

• They are attracted to the negative charge

What is the role of the electrical field in gel electrophoresis?

• To change the pH of the gel

• To heat the gel

• To create a magnetic field

• To cause DNA fragments to migrate

What happens to DNA fragments when the electrical field is applied?

• They dissolve in the gel

• They move towards the positive charge

• They move towards the negative charge

• They remain stationary

What is a DNA ladder used for in gel electrophoresis?

• To estimate the size of DNA fragments

• To separate DNA fragments

• To determine the charge of DNA

• To amplify DNA fragments

How is the size of unknown DNA fragments estimated?

• By comparing them to a DNA ladder

• By measuring their charge

• By their color

• By their density

What does the presence of bands on the gel indicate?

• The DNA has been amplified

• The DNA is uncharged

• The DNA fragments have been separated

• The DNA has been destroyed

How can you tell if two DNA fragments are of similar size?

• They will have the same charge

• They will migrate the same distance

• They will be the same color

• They will be in different columns