How is the size of molecules under analysis measured?

A. By measuring the distance moved through a ruler

B. By measuring the amount of visualizing dye used

C. By running a standard molecule, whose size is known in parallel

D. There is no exact criterion for doing so

Explanation: The size of the DNA molecules is measured by a standardized molecule. It is known as the DNA ladder. The molecules under analysis are compared with the DNA ladder.

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