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Elinor McDermott

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14y ago

Because bacteria can absorb free DNA and become pathogenic (in this case, sometimes it's harmless). But that is only one of three ways bacteria can get new genes:

Transduction- genes transferred from one bacteria to another by a virus

Transfection- What happened in this experiment

Conjunction- Bacterial "Sex"

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Q: Why did the mice die when giffith mixed the live R bacteria and the heat killed S bacteria?
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Harmful bacteria in food can be killed by?

Cooking the food. Raising the heat to te proper level kills bacteria.


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


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 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?

Related questions

What effect did an injection of live R bacteria mixed with heat killed S bacteria have on the mice?

The mice injected with mixture died


What is Fredderick Griffith hypothesis?

Frederick Griffith hypothesized that live, harmless bacteria and the heat-killed bacteria were mixed, some factor was transferred from the heat-killed cells into the live cells! it has nothing to do with bats flying thru walls!!


Who showed bacteria is killed by heat?

Louis Pasteur


How are all bacteria toxins killed?

Toxins are not alive, they are just chemicals which hurt us. They can be made by bacteria among other things. The bacteria can be killed by sufficient heat, but not all toxins are destroyed by heat.


Harmful bacteria in food can be killed by?

Cooking the food. Raising the heat to te proper level kills bacteria.


Bacteria is killed by what?

Bacteria can be killed by various methods, including heat, antibiotics, disinfectants, and certain chemicals. Heat can denature the proteins in bacteria, leading to their death. Antibiotics target specific pathways or structures in bacteria, preventing their growth and reproduction. Disinfectants and chemicals can disrupt the cell membrane or interfere with the metabolic processes of bacteria, leading to their elimination.


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.


Kind of bactaria are killed in pasteurization?

pathogenic microbes.Mostly,bacteria with poor heat resistant.


How much bacteria gets killed from steam?

The amount of bacteria killed by steam depends on various factors such as temperature, exposure time, and bacterial species. Steam can be an effective method for killing bacteria as the heat can denature and destroy proteins essential for bacterial survival. However, some heat-resistant bacteria may require higher temperatures or longer exposure times to be effectively killed by steam.


Why did heat kill Griffith's S bacteria?

Heat killed S bacteria in Griffith's experiment was because of the temperature of the heat. The heat was high enough to kill many things like proteins and enzymes, so the bacteria could not create endospores to harm the immune system.


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 Griffiths experiment suggested that the cause of pneumonia wasnt a chemical poison?

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. The Mice survived, suggesting that the cause of pneumonia was not a chemical poison released by the disease-causing bacteria.