Question

A certain restriction enzyme digest results in DNA fragments of the following sizes: 4,000 bp, 2,500 bp, 2,000 bp, and 400 bp. Sketch the resulting separation by electrophoresis. Show starting point, positive and negative electrodes, and the resulting position of the DNA bands. ( this will all be in one column or well)

Answer 1

Answer:

Smaller the size of the DNA fragment, farther it moves during electrophoresis. The sketch of the position of the fragments has been drawn in the figure below.

Explanation:

As we know DNA is a negatively charged molecule. So during electrophoresis the fragments move towards the positive electrode because opposite charges attract each other.

Different fragment move different distances according to their size during the electrophoresis. Smallest segment travels the largest distance in the gel medium while the largest one travels least distance.

In the question there are four DNA fragments with base pairs 4000, 2500, 2000 and 400 so the smallest segment with 400bp will be farthest from the starting point and the largest fragment with 4000bp will travel least distance in the gel medium. Their respective positions are shown in the figure below. The starting point is near the negative electrode.

Answer 2

When The smaller the size of the DNA fragment, the more outlying it shifts during electrophoresis. So it is the negative electrode.

What is DNA?

As we Comprehend DNA is a negatively charged molecule. So during electrophoresis, the fragments move towards the optimistic electrode because opposing charges entice each other.

Different fragments move different spreads according to their size during the electrophoresis. The smallest segment traverses the largest distance in the gel medium while the largest one travels the least distance.

In the query, there are four DNA fragments with bottom pairs 4000, 2500, 2000, and 400 so the smallest segment with 400bp will be outlying from the starting point and the largest fragment with 4000bp will transit the least distance in the gel medium. Thus,  the negative electrode.

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