Question

Which of the following represents a bond between a purine and

pyrimidine in that order?

(a) C - T (b) G - A (c) G - C (d) T - A​

Answer 1

Answer:

Purines and pyrimidines are the nitrogen bases that hold DNA strands together through hydrogen bonds. They pair together through complementary pairing based on Chargaff's Rule (A::T and G::C)

Answer 2

(c) G - C represents a bond between a purine and  pyrimidine in that order.

Explanation:

• Purines and pyrimidines are two nitrogenous bases that play a crucial role in the DNA structural backbone. Purines are adenine and guanine, while pyrimidines are cytosine and thymine.
• Purines and pyrimidines produce H-bonds when they come into contact. Adenine creates two hydrogen bonds with thymine, but cytosine and guanine make three hydrogen bonds.
• Because purines and pyrimidines constantly bind together - a process known as complementary pairing, the ratio of the two will never change within a DNA molecule.
• Purines and pyrimidines are two nitrogenous base families that make up nucleic acids or the building blocks of DNA and RNA.