KCET · BIOLOGY · STD 12 - 5. Molecular Basis of Inheritance
The result of which of the following reaction experiments carried out by Avery et.al. on Streptococcus pneumoniae has proved conclusively that DNA is the genetic material?
- A Live 'R' strain + DNA from 'S' strain + RNAase
- B Live 'R' strain + DNA from 'S' strain + DNAase
- C Live 'R' strain + Denatured DNA of 'S' strain + protease
- D Heat killed 'R' strain + DNA from 'S' strain + DNAase
Answer & Solution
Correct Answer
(B) Live 'R' strain + DNA from 'S' strain + DNAase
Step-by-step Solution
Detailed explanation
(B) Live 'R' strain + DNA from 'S' strain + DNAase,
R-strain is rough and harmless, while S-strain is smooth and virulent form of Streptococcus pneumoniae. In their experiment, Avery et al., found out that only when DNA from S-type get converted to S- type strain. This transformation of R into S-type bacteria is added to a culture of R - type bacteria, R-type get converted to S-type strain.
R-strain is rough and harmless, while S-strain is smooth and virulent form of Streptococcus pneumoniae. In their experiment, Avery et al., found out that only when DNA from S-type get converted to S- type strain. This transformation of R into S-type bacteria is added to a culture of R - type bacteria, R-type get converted to S-type strain.
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