Question

In 1944, Avery, McCarty and MacLeod isolated a substance from heat killed virulent form of bacteria and added to non-virulent form of bacteria which changed the non-virulent to virulent from this substance can be destroyed by

• A. DNAse
• B. Protease
• C. Lipase
• D. Amylase

Answer 1

Answer: (A)

DNAse

• Avery, McCarty and MacLeod are the scientists who performed the experiments which proved that the transforming principle is the DNA.
• The DNA of the virulent bacteria helped in the conversion of the DNA of the non-virulent bacteria.
• The non-virulent bacteria were transformed into a virulent form. The DNAse is the enzyme that can destroy the DNA.
• It causes cleavage of the nucleotides in the sequence of the DNA.

Thus, the correct answer is option A.