Gel Electrophoresis Concepts and Applications

Professor Dave explains gel electrophoresis, a key technique in molecular biology for separating DNA and proteins. The process involves using a gel and electric current to separate molecules based on size and charge. Smaller DNA fragments travel further through the gel, allowing for analysis and visualization. This technique is crucial for various applications, including gene amplification and protein analysis.

What is the primary purpose of gel electrophoresis in molecular biology?

• To create recombinant DNA

• To separate large molecules like DNA segments

• To measure the pH of a solution

• To synthesize new DNA strands

What type of gel is commonly used in gel electrophoresis?

• Thin layer chromatography gel

• Polyacrylamide or agarose gel

• Gelatin

• Silica gel

In gel electrophoresis, what is the role of the cathode?

• To cut DNA molecules

• To neutralize DNA molecules

• To repel DNA molecules

• To attract DNA molecules

Why do smaller DNA molecules travel further in the gel?

• They are less dense

• They have less difficulty navigating through the gel pores

• They are more negatively charged

• They are attracted to the cathode

What is the process called when DNA molecules move through the gel?

• Filtering

• Sieving

• Sifting

• Diffusion

How is the data visualized after gel electrophoresis?

• By measuring the pH change

• By weighing the gel

• By adding a DNA binding dye that fluoresces under UV light

• Using a microscope

What does a band further from the well indicate about the DNA molecule?

• It is shorter

• It is longer

• It is less charged

• It is more charged

Which technique can be used to analyze the results of plasmid digestion?

• Southern blotting

• Western blotting

• Northern blotting

• Eastern blotting

Besides DNA, what else can gel electrophoresis separate?

• Lipids

• Proteins

• Vitamins

• Carbohydrates

What makes gel electrophoresis a crucial tool in molecular biology labs?

• Its complexity and high cost

• Its simplicity and immense utility

• Its ability to synthesize DNA

• Its ability to change DNA sequences