BIOMOLECULES AND ENZYMES

Detailed explanation-1: -In DNA, adenine always pairs with thymine (A-T), and guanine always pairs with cytosine (G-C). RNA is the same, except that adenine always pairs with uracil (A-U).

Detailed explanation-2: -DNA base pair. Under normal circumstances, the nitrogen-containing bases adenine (A) and thymine (T) pair together, and cytosine (C) and guanine (G) pair together.

Detailed explanation-3: -It is important to note that in RNA (RiboNucleic Acid), adenine pairs with uracil because RNA molecules do not contain any thymine. The shape of the uracil molecule is very similar to thymine; the only difference is that uracil (formula C4H4N2O2 C 4 H 4 N 2 O 2 ) is missing a methyl group (-CH3 C H 3 ).

Detailed explanation-4: -Neither DNA nor RNA base pairs uracil with guanine. Guanine base pairs with a pyrimidine called cytosine. The conformation of guanine does not allow it to form hydrogen bonds with uracil. Uracil base pairs with the purine base adenine.