Don't understand replica plating...

Discussion of all aspects of cellular structure, physiology and communication.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
WiseIdiot
Garter
Garter
Posts: 8
Joined: Sat Oct 18, 2008 5:51 pm

Don't understand replica plating...

Post by WiseIdiot » Sat Nov 08, 2008 8:06 pm

my textbook says that the mutagenized E.Coli colonies (I assumed that they were mutants that were deficient in lactose metabolism) were grown in a medium containing just glucose. Then, some of the cells from each colony were transferred to medium with just lactose, i.e., the replica plate. Subsequently, the cells that differed from the replica plate that were on the master (original) plate were unable to metabolize lactose.
This is redundant since the mutagenized cells were initially selected for their defects in metabolizing lactose. Why would this last step even occur?

User avatar
MrMistery
Inland Taipan
Inland Taipan
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)
Contact:

Post by MrMistery » Sun Nov 09, 2008 8:48 pm

i think you are actually working with cells that are unable to metabolize lactose but have been transformed with a plasmid that bears the lacZ gene. And the answer you are looking for is the protein known as CAP.
Good luck
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest