MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Organic ChemistryBiomoleculesPrevious Year Questions

In DNA, the complimentary bases are (AIPMT 2008)

A.adenine and guanine; thymine and cytosine

B.uracil and adenine; cytosine and guanine

C.adenine and thymine; guanine and cytosine✓ Correct

D.adenine and thymine; guanine and uracil.

Explanation

DNA contains two types of nitrogeneous bases: Purine -> Adenine (A) and guanine (G) ; Pyrimidine -> Cytosine (C) and thymine (T) The purine and pyrimidine bases pair only in certain combination. Adenine pairs with thymine (A : T) by two hydrogen bonds and guanine with cytosine (G : C) by three hydrogen bonds.

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Biomolecules.

Start Free Practice →