What is the purpose of a DNA ladder in gel electrophoresis?

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Question: What is the purpose of a DNA ladder in gel electrophoresis?

Options:

Correct Answer: To provide a size reference for DNA fragments

Solution:

A DNA ladder serves as a size reference for comparing the lengths of DNA fragments in the gel.

What is the purpose of a DNA ladder in gel electrophoresis?

What is the purpose of a DNA ladder in gel electrophoresis?

Step 1: Understand that gel electrophoresis is a technique used to separate DNA fragments based on their size.
Step 2: Know that a DNA ladder is a mixture of DNA fragments of known sizes.
Step 3: When you run the gel electrophoresis, you also load the DNA ladder into one of the wells of the gel.
Step 4: After the gel is run, the DNA ladder will create bands at specific positions that correspond to its known sizes.
Step 5: You can then compare the positions of your DNA samples' bands to the bands of the DNA ladder.
Step 6: This comparison helps you determine the sizes of your DNA fragments.

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