Which best describes why gel electrophoresis works?
a. dna with mutations cannot pass through the gel.
b. dna with a more negative charge moves more slowly.
c. smaller dna segments move more easily through the gel.
d. reverse transcriptase molecules have a negative charge.

Ans. (C). smaller DNA segments move more easily through the gel.

Gel electrophoresis is defined as a molecular biology technique, used for the separation of DNA molecules from a mixture. In this,  the agarose gel, placed in a buffer, is used through which, molecules of DNA get separated.

The gel electrophoresis equipment has two poles, positive pole and negative pole at the each end. When current is allowed to the system, DNA molecules (negatively charged) run on the gel (towards the positive charge) according to their shape and size.

The smaller DNA fragments move faster and more quickly than larger fragments, and bands of different DNA molecules are formed in the gel according to their size.

Thus, the correct answer is option (C).

wegner's theory did not explain how the continents could move

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