RNA structure with purines and pyrimidines
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Answer:See this is an image image of RNA structure with purines and pyrimidines
Explanation:The purines in DNA are adenine and guanine, the same as in RNA. The pyrimidines in DNA are cytosine and thymine; in RNA, they are cytosine and uracil. Purines are larger than pyrimidines because they have a two-ring structure while pyrimidines only have a single ring.
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Answer:
The most important difference that you will need to know between purines and pyrimidines is how they differ in their structures.
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.
Because purines are essentially pyrimidines fused with a second ring, they are obviously bigger than pyrimidines. This size difference is part of the reason that complementary pairing occurs. If the purines in DNA strands bonded to each other instead of to the pyrimidines, they would be so wide that the pyrimidines would not be able to reach other pyrimidines or purines on the other side! The space between them would be so large that the DNA strand would not be able to be held together. Likewise, if the pyrimidines in DNA bonded together, there would not be enough space for the purines.