Question

Which of the following is responsible for transforming the R strain into the S strain?

• A. Purified bio-chemicals from S-strain
• B. Purified bio-chemicals from R-strain
• C. Purified bio-chemicals from heat killed S-strain
• D. Purified bio-chemicals from heat killed R-strain

Answer 1

Answer:

C. Purified bio-chemicals from heat killed S-strain

S-strains are the virulent ones which have the ability to kill a mouse when injected into it. But, when the heat killed S-strain is injected into the mouse along with the R-strain, the mouse happens to die due to transformation. The purified bio-chemicals (protein, DNA and RNA) from the heat killed S-strain, transforms the R-strain into the S-strain (virulent).