Plasmid DNA (0.5 g) containing an ampicillin resistance marker was added to 200 l of competent cells. The transformed competent cells were diluted 10,000 times, out of which 50 l was plated on agar plates containing ampicillin. A total of 35 colonies were obtained. The transformation efficiency is _____ 106 cfu. g 1.

Plasmid DNA (0.5 g) containing an ampicillin resistance marker was ad

1.	Plasmid DNA (0.5 g) containing an ampicillin resistance marker was added to 200 l of competent cells. The transformed competent cells were diluted 10,000 times, out of which 50 l was plated on agar plates containing ampicillin. A total of 35 colonies were obtained. The transformation efficiency is _____ 106 cfu. g 1.
A.	0.6
B.	1.4
C.	2.8
D.	4.8
Answer» D. 4.8

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