a. Possible - don't laugh - this happened to me!
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b. Wrong. Cells that don't incorporate the transfected DNA should die, because they lack the gene for G-418 resistance.

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c. Possible - in this case Ronnie should repeat the experiment using a new stock of antibiotics of the appropriate concentration. (Check answer D too.)

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d. Possible - Ronnie should check whether:

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e. Possible - we hope that is the case.

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f. Possible. Only further analysis will reveal whether these cells actually incorporated the transfected DNA.

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