- 1(current)
Q. No.In Griffith's experiment, which of the following bacterial strains was capable of causing pneumonia in mice?
| 1. | Live R |
| 2. | Bacteria strain with polysaccharide coat |
| 3. | Heat Killed S |
| 4. | Live R with capsule and Heat Killed S |
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Frederick Griffith discovered:
| 1. | DNA is the genetic material |
| 2. | RNA can be the genetic material |
| 3. | Streptococcus has two strains |
| 4. | Bacterial transformation |
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In Avery, Macleod, and McCarty's experiment, the transformation of bacteria was inhibited by:
| 1. | Proteases | 2. | RNase |
| 3. | DNAs | 4. | None of these |
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The unequivocal proof that DNA is the genetic material was provided by:
| 1. | Avery, Macleod, and McCarty |
| 2. | Hershey and Chase |
| 3. | Meselson and Stahl |
| 4. | Watson and Crick |
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Hershey and Chase proved DNA as the genetic material in their experiment because :
| 1. | Bacteria that were infected with viruses that had radioactive proteins were not radioactive. |
| 2. | Bacteria that were infected with viruses that had radioactive DNA were radioactive. |
| 3. | Both 1 and 2 are correct. |
| 4. | Both 1 and 2 are incorrect. |
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A molecule that can act as a genetic material must fulfil all the following criteria except:
| 1. | It should be able to generate its replica |
| 2. | It should chemically and structurally be stable |
| 3. | It should provide scope for rapid mutations |
| 4. | It should be able to express itself in the form of “Mendelian Characters” |
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Heat-killed S form Streptococcus extract treated with proteases is mixed with live R form Streptococcus cells and injected into living mice. What is most likely to happen?
| 1. | The mice would live. |
| 2. | The mice would die. |
| 3. | The mice's blood would have dead R cells. |
| 4. | A new strain of Streptococcus will be present in mice. |
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Avery, MacLeod, and McCarty used DNase in their experiment because:
| 1. | It enabled them to isolate pure DNA samples. |
| 2. | It enabled them to isolate pure protein samples. |
| 3. | This allowed them to demonstrate that removing the DNA prevents transformation. |
| 4. | It made sure that RNA will always be present when they attempted to transform the R strain. |
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Q. No.
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