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What happened when griffith the mice with the harmless R strain bacteria alone?
Wiki User
∙ 9y ago
t He then took the R strain (rough strain) and injected it into the mice and found that they did not contract the pneumonia illness and survived the insertion of the strain
Nestor Heller
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What is A species of bacteria that lives in the intestines of many mammals?
the harmless strain of E.Coli
What did Avery's experiments add to the knowledge gained from Griffith's experiments?
American biologist Oswald Avery and his colleagues took Griffith's experiments one step further. To test whether protein was the transforming factor, they treated Griffith's mixture of heat-treated deadly strain and live harmless strain with protein-destroying enzymes. The bacterial colonies grown from the mixture were still transformed. Avery and his colleagues concluded that protein could not be the transforming factor.
What was the purpose of Frederick Griffith's studies?
Griffith discovered transformation. Transformation is what we would today describe as the motion of DNA from one cell to another. But in those days, it was not known that DNA was the genetic material. All that was known was that something caused transformation.S virulent strains of Streptococcus pneumoniae were injected into mice. The mice promptly perished from pneumonia due to the bacterial virulence. Second, mice had R nonvirulent strain of Streptococcus pneumoniae injected. The mice were fine afterwards due to the nonvirulence of the bacterium. Heat killed S virulent bacteria had no effect either. However something rather sinister happened when S virulent (heat killed) and R nonviruent were mixed in together and entered the mice.The S virulent were dead and could do nothing. But it appeared a transforming medium must have traversed from them to the R nonvirulent (live) strain. The R nonvirulent became S virulent and killed the mice ferociously. Something very odd had happened. A transforming principle. Transformation had been discovered.nicely put, but you missed some points.Fredrick Griffith was a bacteriologist who discovered transformation. Transformation is what we would today explain as the movement of DNA from one cell to another. But back in those days, DNA was not known as a genetic material; all they know was that something caused transformation. In his experiment, Griffith found that if the dangerous S bacteria strains of Streptococcus pneumonia (that he put in a capsule to stop the bodies defense systems) were injected into mice, then the mice quickly died from pneumonia because of the bacterial poisoning. The other mice that were infected with the R bacteria were fine. In order to see if the capsules were killing the mice, Griffith injected dead S bacteria in the mice, but that had no effect. So, afterwards, he injected the mice with heat-killed S bacteria, but that had no effect either. So now, Griffith knew that the capsule did not kill the bacteria. The purpose of the heat-killed bacteria was so they could no longer reproduce. However something pretty disturbing happened when the previously harmless heat-killed S bacteria and previously harmless R bacteria were mixed in together and injected into the mice, the mice died. Griffith, mystified, checked the blood of the dead mice and found that the harmless R bacteria had aqquierd capsules. So, in other words the harmless R bacteria had become the harmful S bacteria. Griffith had discovered what we now call "transformation".
What important question remained unanswered by griffith experiment?
Assuming you mean the Frederick Griffith bacterial experiment, the question left unanswered was how the rough strain (less harmful) bacteria transformed into the smooth strain (lethal) bacteria. When he injected live rough strain bacteria, the mouse lived. When he injected live smooth strain bacteria, the mouse died. But if dead smooth strain bacteria was injected, the mouse lived. So if either live rough strain or dead smooth strain could be injected without killing the mouse, then it would stand to reason that one could inject both, the mouse should live. But the mouse died. So he figured the rough strain was somehow taking on the characteristics of the smooth strain bacteria, perhaps by being in close proximity to dead smooth strain bacteria, but he didn't know why. We now know that the smooth strain DNA was somehow getting grafted into the rough strain bacteria and making it able to create a coating which prevented the immune system (of the mouse in this case) from killing it. In case you mean the John Howard Griffin racial change experiment, the question left unanswered was how to stop racism. While his experiment was not completely successful, he gained a number of insights into the experiences of men of color in America. He was able to speak to people in both groups, but yet, he was not able at that point to get them to reconcile with each other.
What is transformed from rough strain bacteria to smooth strain cells?
DNA
What did Griffth observe when he injected a mixture of heat killed disease causing bacteria and live harmless bacteria into mice?
What did griffith observe when he injected into mice a mixture of heat-killed disease-causing bacteria and live harmless bacteria?
What is A species of bacteria that lives in the intestines of many mammals?
the harmless strain of E.Coli
Who discovered that the hereditary system of one strain of bacteria?
Frederick Griffith is credited with discovering the hereditary system involving transformation in bacteria. In his experiments with Streptococcus pneumoniae in 1928, Griffith observed that genetic material could be transferred between different strains of bacteria, influencing their traits. This discovery laid the foundation for understanding DNA as the hereditary material.
When Fredrick griffith injected mice with a mixture of both heat killed smooth strain bacteria and live rough strain bacteria an unexpected result occured this result was?
C. the mice died because rough strain bacteria had been transformed to the smooth strain
The strain of bacteria that caused pneumonia grew into what colonies on culture plates?
The disease-causing strain of bacteria grew into smooth colonies on culture plates, whereas the harmless strain produced with rough edges.
What was 'transformed' in Griffith's experiment?
Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form.
What are 4 steps in Griffith's experiments?
S Strain ---> inject into mice ---> Mice Die R Strain ---> inject into mice ---> Mice Live Griffith was able to kill bacteria by heating them. He observed that heat-killed S Strain bacteria injected into mice did not kill them. When he S Strain (heat Killed) ---> Injected into mice ---> Mice Live S Strain ( heat Killed) + R Strain (Live) ---> Injected into mice ---> Mice Die
During his experiments to find a cure for pneumonia Frederick Griffith discovered that one strain of bacteria had been transformed into another Griffith called this process?
it's called transformation!! lol
What did Griffith discover as a result of his experiments?
Frederick Griffith was a British bacteriologist. In January 1928, he reported what is now known as Griffith's Experiment, the first widely accepted demonstrations of bacterial transformation, whereby a bacterium distinctly changes its form and function.
How does Frederick Griffith's experiment demonstrate transformation?
Frederick Griffith's experiment showed that genetic material could be transferred between different strains of bacteria, leading to a change in their characteristics. This transfer of genetic material is known as transformation, which was demonstrated when the nonvirulent strain of bacteria was transformed into a virulent one after being in contact with genetic material from the virulent strain.
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.
Strain of bacteria?
s-strain bacteria make
