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Because their shapes allows them to form together with hydrogen bonds

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How are pyrimidines different from the purines?

Pyrimidines (cytosine, thymine, uracil) have a single-ring structure, while purines (adenine, guanine) have a double-ring structure. Purines always pair with pyrimidines in DNA and RNA bases. Additionally, purines are larger molecules compared to pyrimidines.


Can purines pair with other purines?

No, purines cannot pair with other purines in DNA or RNA. Purines always pair with pyrimidines through complementary base pairing to maintain the double-stranded structure of DNA. In DNA, adenine (a purine) pairs with thymine (a pyrimidine) and guanine (a purine) pairs with cytosine (a pyrimidine).


What group of nitrogeneous bases pair with purines during base pairing?

Pyrimidines.


How do purines differ from pyrimidines?

Purines and pyrimidines are the building blocks of nucleic acids. The difference between purines and pyrimidines is in the number of carbon-rings present. Pyrimidines contain one carbon-ring while purines have two.


Which one is purines and pyrimidines are bigger?

Purines because purines have two rings where as pyrimidines have only one ring.


How is Presence of purines and pyrimidines in DNA found?

Adenine and Guanine are purines, and Thymine and Cytosine are pyrimidines.


What do purines bond to?

Purines bond to pyrimidines in nucleic acid DNA .


What is the diameter of the DNA double helix?

Purines always bond with Pyrimidines.


What are the two classes of nitrogen bases?

The two classes of nitrogen bases are purines and pyrimidines. Purines include adenine and guanine, which have a double-ring structure, while pyrimidines include cytosine, thymine, and uracil, which have a single-ring structure.


Purines and pyrimidines are?

Purines and pyrimidines are nitrogen bases found in DNA and RNA .They are nitrogen containing heterocyclic compounds .Purines are large double ringed while pyrimidines are small single ringed .


Do purines bond with pyrimidines in Dna?

Adenine and guanine, being purines ( double ringed ) always bond with thymine and cytosine, single ringed pyrimidines.


How many purines and pyrimidines are present in the DNA molecule?

There are two purines (adenine and guanine) and two pyrimidines (cytosine and thymine) present in the DNA molecule.