Question

Which of the following is most effective chemical mutagen?

• A. Methane
• B. Guanine
• C. N-ethyl-N-nitrosourea
  
• D. Caffeine

Answer 1

The correct option is C N-ethyl-N-nitrosourea

A. Methane is component of various chemical mutagens such ethyl methane sulphanate .

B. Guanine is a pyrimidine and one of four nucleotides found in nucleic acids DNA and RNA.

C. N-ethyl-N-nitrosurea is a potent mutagen and is an alkylating agent which causes transitions and transversions mutations in DNA.

D. Caffeine is an alkaloid found in coffee. It is a stimulant of central nervous system.

Hence, most effective chemical mutagen is N-ethyl-N-nitrosurea. So, the correct answer is 'N-ethyl-N-nitrosourea'.