Question

Which statement is false regarding nucleic acids?

• A. Base pairing occurs between purine and pyrimidine
• B. The two nucleotide chains in DNA have opposite polarity
• C. Guanine : cytosine bonding involves the formation of two hydrogen bonds
• D. A hydrogen-bonded base pairs in a DNA double helix forms an approximately planar structure

Answer 1

The correct option is C Guanine : cytosine bonding involves the formation of two hydrogen bonds

The purine bases of one nucleotide chain form hydrogen bonds with the pyrimidine bases present directly opposite them on the other chain. The hydrogen bonds are formed in the polar aqueous environment. The adenine base pairs with thymine with two hydrogen bonds and guanine base pairs with cytosine with three hydrogen bonds.

So, the correct answer is option C.