Looking for classes? Ksquare Career Institute, Bengaluru →
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
A
Guanine, Adenine - Purines
B
Adenine, Thymine - Purines
C
Thymine, Uracil - Pyrimidines
D
Uracil, Cytosine - Pyrimidines
Detailed Solution
Nitrogenous bases of nucleic acids are of two types.
Purines are double-ringed bases: Adenine and Guanine.
Pyrimidines are single-ringed bases: Cytosine, Thymine and Uracil.
Adenine is a purine but thymine is a pyrimidine, so the pair Adenine, Thymine - Purines is wrongly matched.
Guanine and adenine are both purines; thymine and uracil are both pyrimidines; uracil and cytosine are both pyrimidines. These three pairs are correctly matched.
Thymine is found in DNA and uracil replaces it in RNA.
Purines are double-ringed bases: Adenine and Guanine.
Pyrimidines are single-ringed bases: Cytosine, Thymine and Uracil.
Adenine is a purine but thymine is a pyrimidine, so the pair Adenine, Thymine - Purines is wrongly matched.
Guanine and adenine are both purines; thymine and uracil are both pyrimidines; uracil and cytosine are both pyrimidines. These three pairs are correctly matched.
Thymine is found in DNA and uracil replaces it in RNA.