Question

Which substance is not present in nucleic acids?

• A. Cytosine
• B. Adenine
• C. Thymine
• D. Guanidine

Answer 1

Answer: (D)

Nucleic acid does not contain guanidine.

$\underset{\text{Guanidine}}{(HN=\stackrel{\underset{|}{N{H}_2}}{C}-N{H}_2)}$