The function of a ladder in gel electrophoresis is to gauge the size of bands in the sample. Thus, option A is correct.
Gel electrophoresis is a method of visualization, separation, purification, isolation of biological molecule like DNA, RNA, proteins based on their size.
After supplying electric charge to electrophoresis tray, the negatively charged DNA molecules moves to positive pole and smaller DNA molecules can move faster than large sized molecule.
A ladder is a standard weight-sized artificially made reference molecular marker which is used to determine the size of the unknown DNA fragment.
RNA ladder and protein ladder are used in terms RNA and protein related experiments.
DNA ladders varies from different lengths with known fragment size and concentration
Hence, option A is correct.
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Your question was incomplete. So the probable question was
what is the function of a ladder in gel electrophoresis?
A. Gauge the size of bands in the sample
B. Prevent the bands from running of the gel
C. Negative control
D. positive control
