) Which of the following best explains Griffith’s transformation experiments? Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living S strain was recovered from the dead mouse. From this, it was later concluded that that mutation occurred in the DNA of the R-strain cells thus transforming them into a pathogenic S strain. Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living S strain was recovered from the dead mouse. From this observation, it was later concluded that external DNA from the inactivated S strain was taken up by the R-strain cells thus transforming them into a pathogenic S strain. Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living R strain was recovered from the dead mouse. From this, It was later concluded that external DNA from the inactivated S strain was taken up by the S-strain cells thus transforming them into a non-pathogenic R strain. Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated R strain (pathogenic) and living S strain (non-pathogenic). The mouse died and living R strain was recovered from the dead mouse. From this, it was later concluded that that mutations occurred in the DNA of the S-strain cells thus transforming them into a non-pathogenic R strain. 1B) Which of the following is most likely to have a small protein called ubiquitin attached to it? An mRNA produced by an egg cell that will be blocked from being used in translation A protein that needs to be synthesized at the surface of the rough ER A protein that targeted for degradation by the proteosome A cell surface protein that needs to be transported from the rough ER to the plasma membrane A secretory protein that requires sugar residues to be attached
Genetic Recombination
Recombination is crucial to this process because it allows genes to be reassorted into diverse combinations. Genetic recombination is the process of combining genetic components from two different origins into a single unit. In prokaryotes, genetic recombination takes place by the unilateral transfer of deoxyribonucleic acid. It includes transduction, transformation, and conjugation. The genetic exchange occurring between homologous deoxyribonucleic acid sequences (DNA) from two different sources is termed general recombination. For this to happen, an identical sequence of the two recombining molecules is required. The process of genetic exchange which occurs in eukaryotes during sexual reproduction such as meiosis is an example of this type of genetic recombination.
Microbial Genetics
Genes are the functional units of heredity. They transfer characteristic information from parents to the offspring.
1A)
Which of the following best explains Griffith’s transformation experiments?
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Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living S strain was recovered from the dead mouse. From this, it was later concluded that that mutation occurred in the DNA of the R-strain cells thus transforming them into a pathogenic S strain. |
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Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living S strain was recovered from the dead mouse. From this observation, it was later concluded that external DNA from the inactivated S strain was taken up by the R-strain cells thus transforming them into a pathogenic S strain. |
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Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated S strain (pathogenic) and living R strain (non-pathogenic). The mouse died and living R strain was recovered from the dead mouse. From this, It was later concluded that external DNA from the inactivated S strain was taken up by the S-strain cells thus transforming them into a non-pathogenic R strain. |
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Two strains of S. pneumoniae were used for the experiment. Griffith injected a mouse with heat-inactivated R strain (pathogenic) and living S strain (non-pathogenic). The mouse died and living R strain was recovered from the dead mouse. From this, it was later concluded that that mutations occurred in the DNA of the S-strain cells thus transforming them into a non-pathogenic R strain. |
1B)
Which of the following is most likely to have a small protein called ubiquitin attached to it?
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An mRNA produced by an egg cell that will be blocked from being used in translation |
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A protein that needs to be synthesized at the surface of the rough ER |
||
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A protein that targeted for degradation by the proteosome |
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A cell surface protein that needs to be transported from the rough ER to the plasma membrane |
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A secretory protein that requires sugar residues to be attached |
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