WAYS DNA IS TRANSFERRED IN BACTERI1

WAYS DNA IS TRANSFERRED IN BACTERI1 - WAYS DNA IS...

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WAYS DNA IS TRANSFERRED IN BACTERIA      1. Transformation ---genes are transferred from one bacterium to another as “naked” DNA in a  solution. This process was demonstrated before it was understood, about 70 years ago, with 2  strains of  Streptococcus pneumoniae.  One strain, which did not have a capsule, was avirulent (did  not cause disease). The other strain did have a capsule and caused severe pneumonia. Working on  a vaccine against the virulent strain, Frederick Griffith injected mice with both live and dead  avirulent bacteria, neither of which made the mice sick. However, when Griffith mixed DEAD  virulent bacteria with LIVING avirulent bacteria and injected this mixture into the mice, many of  the mice died, and living, encapsulated bacteria could be recovered from their blood. Genes from  the dead bacteria had been transferred to the living ones. The living avirulent bacteria had been 
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This note was uploaded on 01/23/2012 for the course MCB MCB2010 taught by Professor Smith during the Fall '09 term at Broward College.

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WAYS DNA IS TRANSFERRED IN BACTERI1 - WAYS DNA IS...

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