Question

question 4 (1 point)
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substance added to monitor movement of dna fragments.
a) loading dye
b) agarose
c) gel buffer
d) methylene blue

Explanation:

Loading dye is added to DNA samples in gel electrophoresis. It helps in visualizing the movement of DNA fragments as it has a known migration rate. Agarose is the matrix for separation. Gel buffer maintains pH. Methylene blue is not used for this specific monitoring purpose.

Answer:

A. loading dye