Which of the following is correct about use of bacterial strain in Avery, Macleod and McCarty experiment to establish DNA as genetic material?

Correct option is D

Correct Answer: (d)
Explanation:
Mixing heat-killed S strain with live R strain resulted in transformation of R into S type, proving DNA is the genetic material.
Information Booster:
S strain is virulent; R strain is non-virulent.
Heat inactivates cells but DNA remains intact.
DNA from S strain entered live R strain.
Transformed R cells gained capsule like S type.
This proved inheritance is controlled by DNA.
Additional Information (Incorrect Options):
(a) Both are alive; no transformation demonstration.
(b) Live S is already virulent; no proof gained.
(c) No live strain → transformation cannot occur.