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 |
Frederick Griffith discovered:
1. | DNA is the genetic material |
2. | RNA can be the genetic material |
3. | Streptococcus has two strains |
4. | Bacterial transformation |
In Avery, Macleod, and McCarty's experiment, the transformation of bacteria was inhibited by:
1. | Proteases | 2. | RNase |
3. | DNAs | 4. | None of these |
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 |
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. |
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” |
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. |
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. |