X-Gal: galactose linked to a substituted indole; used to screen for bacteria containing recombinant plasmids
X-Gal is included in the growth medium on which cells transformed with bacterial plasmids are grown. The reason X-Gal is included is to _______.
a) eliminate bacteria that do not contain recombinant plasmid
b) eliminate bacteria that do not contain plasmid DNA
c) minimize the chances that a vector will re-circularize without incorporating a fragment of foreign DNA
d) identify bacteria that contain a recombinant plasmid.
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