1. Wrong - apparently this clone does not contain the tetracyclin transactivator. Alternatively, the transfection of the GFP-containing plasmid for the transient expression experiment was unsuccessful. However, it is unlikely, since other transfections at the same experiment worked fine.
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2. Right - since the tet control in this cell line is so leaky, these cells should not be further used.

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3. Right - You should not choose this cell line for further work.

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4. Right

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5. Wrong - the tet control is leaky, and the induced expression is the same as the non-induced one.

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6. Right.

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