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The S bacteria are surrounded by a capsule, so it is not engulfed by the host's white blood cells. That means that it is able to proliferate and spread.
The R bacteria lack the capsule (like the mutant S bacteria), so the white blood cells are able to detect and eliminate them.
What else can I help you with?
Why were the S bacteria but not the R bacteria virulent?
The S bacteria possess a protective polysaccharide capsule that helps them evade the immune system, allowing them to survive and cause infection. The R bacteria lack this capsule and are easily targeted and eliminated by the immune system, thus they are not virulent.
Why did the mice die when giffith mixed the live R bacteria and the heat killed S bacteria?
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Who is the Scientist discovered nonvirulent bacteria transformed into virulent bacteria?
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."
How would you use the word virulent in a sentence?
Virulent means actively poisonous. You could use it in a sentence as, "the man had a virulent snake bite."
Who Was responsible for the experiment with mice and bacteria that led to the hypothesis that when two bacteria were mixed together something was passed to the living cells?
This experiment was conducted by Frederick Griffith in 1928. He observed that when he mixed a harmless strain of bacteria with a heat-killed virulent strain, the harmless bacteria were transformed into a virulent form. This led to the hypothesis that something in the heat-killed bacteria had transformed the live bacteria.
Why was the mixture of S bacteria and R BACTERIA virulent?
The live R bacteria acquired a capsule and became live, virulent S bacteria.
Why was the mixture of heat killed s bacteria and r bacteria virulent?
The live R bacteria acquired a capsule and became live, virulent S bacteria.
What did Griffith find to be true after his experiments with the s and r strain of bacteria?
Griffith hypothesized that a chemical component from the virulent S cells had somehow transformed the R cells into the more virulent S form.
Why were the S bacteria but not the R bacteria virulent?
The S bacteria possess a protective polysaccharide capsule that helps them evade the immune system, allowing them to survive and cause infection. The R bacteria lack this capsule and are easily targeted and eliminated by the immune system, thus they are not virulent.
What did fred griffith find to be true after his experiment with the S and R strains of bacteria?
Fred Griffith found that genetic information could be transferred between different strains of bacteria, specifically between the harmless R strain and the virulent S strain of bacteria. This led to the discovery of transformation, a process where genetic material is exchanged between bacteria.
What was the molecule that caused transformation in Griffith's pneumonia experiment?
The molecule that caused transformation in Griffith's pneumonia experiment was DNA. Specifically, it was the transfer of DNA from heat-killed virulent bacteria to live non-virulent bacteria that resulted in the transformation of the non-virulent bacteria into a virulent form.
What does virulent bacteria mean?
Virulent bacteria are ones that are able to cause disease. Examples of potentially virulent bacteria are Staphylococcus aureus and Neisseria gonorrhea.
How would use virulent be used in a sentence?
this bacteria is virulent strain
What is the S strain of bacteria about the cause disease in animals but a R strain is not?
The S strain of bacteria is virulent due to its ability to produce a protective capsule that helps it evade the host's immune system, allowing it to cause disease in animals. In contrast, the R strain lacks this capsule and is non-virulent, meaning it cannot effectively evade the immune response and does not cause disease. This difference in pathogenicity is a key factor in understanding bacterial infections and their effects on host organisms.
How did Griffith experiments show that hereditary factor was involved in the bacterial transformation?
Griffith's experiments, conducted in the 1920s, demonstrated that non-virulent strains of Streptococcus pneumoniae could be transformed into virulent strains when exposed to heat-killed virulent bacteria. He observed that when live non-virulent bacteria were mixed with the heat-killed virulent bacteria, some of the non-virulent bacteria took up the hereditary material from the dead bacteria, becoming virulent themselves. This transformation indicated the presence of a "hereditary factor" that carried the information necessary for virulence, laying the groundwork for the later discovery of DNA as the genetic material.
Is capsulated bacteria are virulent or non virulent?
Capsulated bacteria are usually more virulent compared to non-capsulated bacteria. The presence of a capsule helps the bacteria evade the host's immune system and promotes its ability to cause disease. Capsules can provide protection against phagocytosis, making the bacteria more likely to establish an infection.
How Griffith prooved DNA as genetic material?
proved transforming principle not proteinchanged non-virulent bacteria into virulentbacteria by mixing with heat killed virulent bacteria
