Bacterial Conjunction & Transformation

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Bacterial Transformation

 - Bacteria dies & breaks open releasing all its contents to the surroundings.

 - The released organelles especially DNA can be picked up by another bacteria via its channel proteins.

 - This picked up DNA can be incorperated into the genome of the bacteria that recieved it.

 - E.g. insertion of an r-strain and s-strain into mice
     > r-strain + heat killes s-strain = mouse died & living s-strain bacteria were present.

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Bacterial Conjugation

Where genetic material can be exchanged.

1 - A conjugation tube forms between a donor & recipient. An enzyme makes a nick in the plasmid.

2 - Plasmid DNA replication starts. The free DNA strand starts moving through the tube into the recipient bacteria.

3 - In the recipient cell, replication starts on the transferred DNA.

4 - The cells move apart & the plasmid in each bacteria forms a circle.

Advantage -> may contribute to genetic variation - in the case of antibiotic resistance genes, survival in the presence of these chemicals could be passed on.

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