Question

Given below are two statements:
Statement I - Avery, Mc Carty and Mac Leod first evidenced to prove the DNA is a genetic material.
Statement II - Hershey and Chase used Streptococcus pneumoniae to confirm the nature of the transforming principle.
In the light of the above statements, choose the correct option given below:

• A. Both statement I and statement II are correct.
• B. Both statement I and statement II are incorrect.
• C. Statement I is correct but statement II is incorrect.
• D. Statement I is incorrect but statement II is correct.

Hint:

Check which scientists proved DNA as the genetic material and which organisms Hershey and Chase actually used.

Answer 1

The Correct Option is C

Step 1: Statement I
Avery, MacLeod and McCarty (1944) purified Griffith's transforming principle. DNase stopped transformation, while protease and RNase did not, so it was DNA. This was the first experimental proof, hence Statement I is correct.

Step 2: Statement II
Hershey and Chase (1952) used T2 bacteriophage and E. coli with radioactive phosphorus and sulphur. Streptococcus pneumoniae was used by Griffith and by Avery's group, so Statement II is incorrect.

Step 3: Conclusion
Statement I is correct but Statement II is incorrect.

Final Answer:
Statement I is correct and Statement II is incorrect. \[ \boxed{\text{(C) }\text{Statement I is correct but statement II is incorrect}} \]