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Griffth performed an experiment where mi...

Griffth performed an experiment where mice were killed when injected with a mixture of heat killed S-strain and live R-strain of Streptococcus, but mice were alive when these strains were injected separately. Mice were killed because

A

Proteins from heat killed S strain made R strain virulent

B

RNA from heat killed S strain made R strain virulent

C

Both DNA and RNA from heat killed strain transformed the R strain and made it pathogenic

D

DNA from heat killed S strain transformed the R strain and made it virulent

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Heat killed S- cells alongwith live R- cells of Diplococcus pneumoniae were injected in mice

In Griffith's transforming principle, if heat-killed S-strain is injected into mice, then :

Knowledge Check

  • Assertion : In Griffith's experiment, a mixture of heat-killed virulent bacteria R and live non - virulent bacteria S, lead to the death of mice. Reason : 'Transforming principle' got transferred from heat -killed R strain and made it virulent.

    A
    If both assertion and reason are true and reason is the correct explanation of assertion
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion
    C
    If assertion is true but reason is false
    D
    if both assertion and reason are false.

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    In an experiment done by Griffith, it was found that when virulent capsulated smooth 'S' bacteria were injected into healthy mice, the mice dies of pneumonia. When mice were injected with non virulent 'R' forms of same bacteria, they survived and did not die to pneumonia. In another case when S-forms were killed by heating at above 60 and injected, rats did not get pneumonia, but when killed, s-forms and R-forms of bacteria were mixed and injected, the rats suffered from pneumonia and died. which one of the following conclusions can be drawn from the above experiment?

    Which of the following is incorrect according to Griffith experiments ? (A) S-Strain to Inject into mice to mice live (B) R-Strain to Inject into mice to mice live (C ) Heat-killed S-Strain to Inject into mice to mice live (D) Heat killed S-Strain + R-Strain to Inject into mice to mice die

    In a series of experiments with Streptococcus and mice F. Griffith concluded that R-strain bacteria had been transformed. Explain.

    Recall the experiment done by Frederick Griffith. If RNA, instead of DNA was the genetic material, would the heat killed strain of strep have transformed the R-strain into virulent strain? Explain your answer.

    There are 5 test tubes having a culture medium containing rough colonies of streptococcus pneumoniae. The following substances were added in them. Which of these test tubes will show smooth colonies of streptococcus pneumoniae on incubation for some time? Test tube I: RNA from a heat-killed smooth strain of streptococcus pneumoniae Test tube II: DNA from a heat-killed smooth strain of streptococcus pneumoniae Test tube III: Protein from a heat-killed smooth strain of streptococcus pneumoniae Test tube IV: Carbohydrate from a heat-killed smooth strain of streptococcus pneumoniae Test tube V: Heat killed smooth strain of streptococcus pneumoniae incubated with DNAse enzyme

    In an ecosystem, four major interdependent components were in the given proportions : what would be the new compostion of the same ecosystem when majority of the hawks were killed ?

    Recell the experiments done by frederick Griffith, Avery, MacLeod and McCarty, where DNA was speculated to be the genatic material. If RNA , instead of DNA was the genetic meterial, would the heat killed strain of pneumoccus have transformed the R-strain into virulent strani? Explain.

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