Which of the following statements about loading dyes is wrong?

Question

BlackTom AI · Accepted Answer

The question asks us to identify the statement about loading dyes that is incorrect. 
Option 1: Often contain glycerol. In practice, loading dyes commonly include glycerol or another dense agent to make the sample denser than the running buffer so it sinks into the well. This statement is true.
Option 2: Come in different colors. Loading dyes are often colored so you can visually track the progress of the sample during loading and electrophoresis. This is also true.
Option 3: Can be added after the gel was run. This implies you would add the loading dye to the gel after electrophoresis has already taken place, which is not how loading dyes are used. They are mixed with the samples before loading and running the gel; this statement is false and thus the incorrect one among the options.
Option 4: Ensure that DNA-dye mix sinks into the gel pocket. The density provided by glycerol or similar substances helps the sample loading dye to sink into the wells rather than float away, aiding proper loading. This statement is true.

BIOL2309.13196.202610 Exam - Multiple Choice Part- Requires Respondus LockDown Browser

Which of the following statements about loading dyes is wrong?

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