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What did Griffth observe when he injected a mixture of heat killed disease causing bacteria and live harmless bacteria into mice?
Griffith discovered that the mice still died, indicating that the harmless bacteria had been transformed into disease-causing bacteria by a hereditary factor from the heat-killed bacteria. This experiment laid the foundation for the discovery of bacterial transformation by Avery, MacLeod, and McCarty.
What result from Griffith experiment suggested that the cause of pneumonia was not a chemical poison released by the diseases causing bacteria?
The difference between "walking pneumonia" and "true pneumonia".
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
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.
What happens when heat-killed S-strain pneumococcus were injected into a mouse along with live R-strain pneumococcus?
A very important characteristic about bacteria actually created live S-strain to exist in the dead injected mouse. Bacteria is competent, in biological terms, meaning that cells can take up "naked" DNA from it's environment. Knowing that fact, when the heat-killed S-strain pneumoccus mixed with the live R-strain, the R-strain took in the DNA, therefore inheriting the deadly coating of the S-strain. So the R became S, and killed the mouse.
What happened when Griffith injected mice with a mixture of heat-killed pneumonia-causing bacteria and live bacteria of the harmless type?
that it was very gay
What result from griffith's experiment suggested that the cause of pneumonia was not a chemical poison released by the disease causin bacteria?
To find out, he took a culture of these cells, heated the bacteria to kill them, and injected the heat-killed bacteria into the mice.
What result from griffith's experiment suggested that the cause of pneumonia was not a chemical poison release by the disease-causing bacteria?
To find out, he took a culture of these cells, heated the bacteria to kill them, and injected the heat-killed bacteria into the mice.
What result from Griffith's experiment suggested that the cause of pneumonia was not a chemical poison released by the disease?
To find out, he took a culture of these cells, heated the bacteria to kill them, and injected the heat-killed bacteria into the mice.
What did Griffth observe when he injected a mixture of heat killed disease causing bacteria and live harmless bacteria into mice?
Griffith discovered that the mice still died, indicating that the harmless bacteria had been transformed into disease-causing bacteria by a hereditary factor from the heat-killed bacteria. This experiment laid the foundation for the discovery of bacterial transformation by Avery, MacLeod, and McCarty.
How did Griffith experiments prove DNA is responsible for mice developing pneumonia?
Griffith's experiments involved injecting mice with different strains of Streptococcus pneumoniae. He observed that mice injected with the heat-killed virulent strain survived, while those injected with live non-virulent strains did not. Remarkably, when he mixed heat-killed virulent bacteria with live non-virulent bacteria, the mice developed pneumonia and died. This indicated that some "transforming principle" from the dead virulent bacteria was taken up by the live non-virulent bacteria, suggesting that DNA was responsible for the trait of virulence.
What happened when griffith the mice with the harmless R strain bacteria alone?
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
What effect did an injection of dead S bacteria have on the mice griffith studied?
The injection of dead S bacteria by Griffith resulted in no harmful effects on the mice. However, when the live R strain was injected along with the dead S bacteria, it caused the mice to become sick and die. This experiment demonstrated that the genetic material from the dead S strain could transform the harmless R strain into a deadly one.
Who was the scientist who demonstrated genetic tranformation by injected mice with two different strains of Streptococcus pneumoniae bacteria?
The scientist was Frederick Griffith, in 1928. Although he believed proteins were involved, it was actually the transfer of DNA. The harmless pneumonia bacteria acquired the DNA from the killed viruses, and became equally lethal.
What effect did an injection of live R bacteria mixed with heat killed S bacteria have on the mice?
The injection resulted in the mice developing pneumonia and dying. This experiment by Griffith in 1928 demonstrated that genetic material could be transferred between bacteria, leading to the concept of bacterial transformation and ultimately the discovery of DNA as the genetic material.
What result from Griffith experiment suggested that the cause of pneumonia was not a chemical poison released by the diseases causing bacteria?
The difference between "walking pneumonia" and "true pneumonia".
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.
