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What scientists demonstrated that bacteria arise only from existing bacteria?
Louis Pasteur demonstrated through his experiments that bacteria arise only from existing bacteria, refuting the idea of spontaneous generation. He conducted experiments that showed that sterile broth remained free of bacteria as long as no outside organisms contaminated it, supporting the concept of biogenesis.
Who divised the concept of the three domains used today?
Carl Woese is credited with devising the concept of the three domains of life - Bacteria, Archaea, and Eukarya. This classification system is based on genetic and biochemical differences among organisms.
Who proposed the lac operon concept?
The lac operon concept was proposed by François Jacob and Jacques Monod in 1961. They described how genes are regulated in bacteria to optimize the use of resources like lactose for energy production.
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.
In an experiment DNA from dead pathogenic bacteria was transferred into living bacteria that do not cause disease These altered bacteria were then injected into healthy mice These mice died of the?
The pathogenic DNA from the dead bacteria became active when combined with the DNA in the live bacteria. When injected into the mice, this reactivated DNA caused the disease and the mice died.
Which concept applies to asexually reproducing species?
some bacteria...
What scientists demonstrated that bacteria arise only from existing bacteria?
Louis Pasteur demonstrated through his experiments that bacteria arise only from existing bacteria, refuting the idea of spontaneous generation. He conducted experiments that showed that sterile broth remained free of bacteria as long as no outside organisms contaminated it, supporting the concept of biogenesis.
What scientist mean by the biological concept?
Organisms are the same species if the have the potential, or actually interbreed one with another. Does not apply to all organisms. Bacteria being an example of this. Is not as strong a concept as once it was as it did not adequately address hybridization.
Who divised the concept of the three domains used today?
Carl Woese is credited with devising the concept of the three domains of life - Bacteria, Archaea, and Eukarya. This classification system is based on genetic and biochemical differences among organisms.
Why did Griffith need to show that the heat killed bacteria didn't make the mouse die?
Griffith needed to demonstrate that the heat-killed bacteria could cause disease symptoms in mice when combined with live non-pathogenic bacteria. This was to show the concept of transformation, where genetic material can be transferred between different bacteria, ultimately leading to understanding how genetic information is transmitted.
What did a doctor in the middle ages do for hygene?
Nothing. This was not something that was thought about. They had no concept of germs or bacteria. Hands were often dirty and blood would be on the clothing of doctors.
Why did they think that magic caused the black death?
Because they didn't understand the concept of bacteria, so they think that it was magic that made them sick and die, or god.
Who proposed the lac operon concept?
The lac operon concept was proposed by François Jacob and Jacques Monod in 1961. They described how genes are regulated in bacteria to optimize the use of resources like lactose for energy production.
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 is the scientific name for domain bacteria?
Monera - the taxonomic kingdom that comprises the unicellular prokaryotes (bacteria and cyanobacteria). Prokaryotes are single-celled organisms that lack a membrane-bound nucleus and usually lack membrane-bound organelles.
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?
The unexpected result was that the previously harmless rough strain bacteria were able to take up genetic material from the heat-killed smooth strain bacteria, becoming virulent. This demonstrated the concept of bacterial transformation and laid the foundation for understanding DNA as the genetic material.
In an experiment DNA from dead pathogenic bacteria was transferred into living bacteria that do not cause disease These altered bacteria were then injected into healthy mice These mice died of the?
The pathogenic DNA from the dead bacteria became active when combined with the DNA in the live bacteria. When injected into the mice, this reactivated DNA caused the disease and the mice died.
