A Fragment of DNA with a Radioactive Label Is Incubated

question 17

Multiple Choice

A fragment of DNA with a radioactive label is incubated with DNase in the presence and absence of a protein that acts as a positive regulator of transcription.The samples are then run on a gel and visualized with autoradiography.Which statement describes a possible result and conclusion from such an experiment?

• A)The banding pattern on the gel is the same with and without the transcriptional regulator, therefore the protein binds the DNA fragment.
• B)Some bands on the gel are absent in the sample with the transcriptional regulator, therefore the protein does not bind the DNA fragment.
• C)Some bands on the gel are absent in the sample with the transcriptional regulator, therefore the protein binds the DNA fragment.
• D)Some bands on the gel are absent in the sample without the transcriptional regulator, therefore the protein does not bind the DNA fragment.

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