THE MOLECULAR BASIS OF INHERITANCE
STRUCTURE OF NUCLEIC ACIDS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Double ringed structures
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Single ringed structures
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Detailed explanation-1: -The purines (adenine and guanine) have a two-ringed structure consisting of a nine-membered molecule with four nitrogen atoms, as you can see in the two figures below. The pyrimidines (cytosine, uracil, and thymine) only have one single ring, which has just six members and two nitrogen atoms.
Detailed explanation-2: -Purine is a heterocyclic aromatic organic compound composed of a pyrimidine ring fused with imidazole ring.
Detailed explanation-3: -Purines have a double ringed aromatic structure. Adenine and guanine are examples of purines. Pyrimidines have a single ringed structure. Cytosine, thymine and uracil are examples of pyrimidine.
Detailed explanation-4: -Purine and pyrimidine base. Adenine is one of the purines. The two rings are formed by a 5-membered ring fused with a 6-membered ring. Conjugated double bonds are found between positions 1 and 6, 2 and 3, 4 and 5, 7 and 8.
Detailed explanation-5: -Adenine (A) and Guanine (G) both have a double ring structure and are called purines.