Multiple Choice
In gel electrophoresis, what is a DNA ladder used for?
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18. Molecular Genetic Tools
Methods for Analyzing DNA
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In gel electrophoresis, what is the primary purpose of a DNA ladder (molecular weight marker)?
A
To stain DNA so bands become visible under UV light
B
To provide a set of DNA fragments of known sizes so the sizes of sample DNA bands can be estimated by comparison
C
To cut DNA at specific recognition sequences to generate restriction fragments
D
To amplify a specific DNA region through repeated cycles of denaturation, annealing, and extension
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