Virulent bacteria are ones that are able to cause disease. Examples of potentially virulent bacteria are Staphylococcus aureus and Neisseria gonorrhea.
capsule increases poisonous effect of bacteria thus cause more diseases so capsulated bacteria are virulent
The live R bacteria acquired a capsule and became live, virulent S bacteria.
this bacteria is virulent strain
The live R bacteria acquired a capsule and became live, virulent S bacteria.
proved transforming principle not proteinchanged non-virulent bacteria into virulentbacteria by mixing with heat killed virulent bacteria
segovia redolfo segovia redolfo
Frederick Griffith discovered the phenomenon wherein exogenous DNA of heat killed virulent bacteria was taken up by a similar but non-virulent bacteria. This resulted in the transformation of the living bacterial cells into the virulent variety. This was prior to the understanding that DNA was the genetic material and the hereditary information passed onto the living bacteria was referred to as the "transforming principle." Source : Russell "iGenetics : A Molecular Approach."
Virulent means very posinous or dangerous.
What does virulent mean
The mice died. This was a fundamental experiment in the history of genetics and helped to establish that DNA was the information and gene carrier for all life. To understand it a little better it's important to know that the heat killed (virulent) bacteria killed the mice when it was living. And the non-virulent did not. But when combined, the non-virulent absorbed some of the DNA from the virulent and was able to make a protective coat that shielded it from the animals immune system... allowing it to kill the mice.
Griffith hypothesized that a chemical component from the virulent S cells had somehow transformed the R cells into the more virulent S form.
Avery used enzymes to break down different components of the heat-killed virulent bacteria to determine which component was responsible for transforming the non-virulent bacteria. This allowed him to identify DNA as the genetic material responsible for the transformation.