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It has to do with the size of each molecule. One is large (double ring) and the other is small (single ring).
By having them pair with each other, the spacing along the length of DNA or RNA is kept uniform.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agoa purine-being adenine and granine-always bonds with a pyrimidine-being cytosine and thymine-because that is the only way that the structure of the DNA stand, a double helix, can be supported. If a purine and a purine paired up there would be too much in the space, therefore not fitting and pushing the double helix outwards. And if a pyrimidine and a pyrimidine paired up there would be too much space left over, making the double helix collapse.
Wiki User
∙ 12y agoThe purines are adenine and guanine, are larger while pyrimidines A and T are smaller sized ..A purine combines with pyrimidine to keep diameter of DNA constant . A forms 2 hydrogen bonds with T and G forms 3 hydrogen bonds with C hence they always pair.
Wiki User
∙ 9y agoPurine must pair with pyrimidine due to their sizes. One has a large double ring and the other one a small single ring. This makes pairing easy for them.
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What bond holds purine bases and pyrimidine bases together?
ATGACGT
How do the base pairing rule relate to chargaffs rules?
Chargaff's rule means that there should be the same number of purine and pyrimidine bases in DNA. The base pairing rules means that A always pairs with T, and G always pairs with C ie. a purine always pairs with a pyrimidine, so there must be the same number of both proving Chargaff's rule.
Number of purine bases in DNA molecule with nine base pairs?
4 A pyrimidine always pairs with a purine, so half of the bases will be pyrimidines and half will be purines.
What statement about Chargaffs rules is carrect?
Observations by Erwin Chargaff that concentrations of the four nucleotide bases differ among species. Within a species, the concentrations of adenine and thymine are always about the same and the concentrations of cytosine and guanine are always about the same. In each species, the amount of adenine equals the amount of thymine. The amount of guanine equals the amount of cytosine.
Constituents of DNA?
Components of DNA include purine bases and pyrimidine bases (which, when combined, make up base pairs), deoyribose sugars, nucleotides and nucleosides.
What bond holds purine bases and pyrimidine bases together?
ATGACGT
How are four bases paired in a molecule DNA?
Adenine(purine)=========thymine(pyrimidine)Guanine(purine)----------------cytosine(pyrimidine)
A particular sequence of parent DNA has five purine bases and two pyrimidine bases. According to base pairing rules, which of the following sequences could be formed during replication?
Chargaff's rule means that there should be the same number of purine and pyrimidine bases in DNA. The base-pairing rules mean that A always pairs with T, and G always pairs with C ie. a purine always pairs with a pyrimidine, so there must be the same number of both proving Chargaff's rule.
What are the three pyrimidine bases?
There are 2 groups of nitrogen bases. These are Pyrimidine and Purine. In the Purine group, there are Adenine and Guanine, In the Pyrimidine group, there are Cytosine, Thymine(replaced by Uracil in RNA).
How do the base pairing rules relate to chargaffs rules?
Chargaff's rule means that there should be the same number of purine and pyrimidine bases in DNA. The base pairing rules means that A always pairs with T, and G always pairs with C ie. a purine always pairs with a pyrimidine, so there must be the same number of both proving Chargaff's rule.
How do the base pairing rule relate to chargaffs rules?
Chargaff's rule means that there should be the same number of purine and pyrimidine bases in DNA. The base pairing rules means that A always pairs with T, and G always pairs with C ie. a purine always pairs with a pyrimidine, so there must be the same number of both proving Chargaff's rule.
How many adenine bases are there if you have 112 purine bases and 64 cytosine bases?
There is no way to tell, since adenine is a purine base, but not the only one. Cytosine is a pyrimidine base. So it can be anything from 0 to 112!
Number of purine bases in DNA molecule with nine base pairs?
4 A pyrimidine always pairs with a purine, so half of the bases will be pyrimidines and half will be purines.
What statement about Chargaffs rules is carrect?
Observations by Erwin Chargaff that concentrations of the four nucleotide bases differ among species. Within a species, the concentrations of adenine and thymine are always about the same and the concentrations of cytosine and guanine are always about the same. In each species, the amount of adenine equals the amount of thymine. The amount of guanine equals the amount of cytosine.
Nitrogenous bases of the purine type?
In DNA cytosine and thymine are pyrimidine derivatives. Uracil (in RNA) is also a pyrimidine. Pyrimidines have only one 6-membered ring.
Pyrimidine base found in DNA and RNA?
Cytosine is the pyrimidine that bonds to the purine Guanine in both DNA and Rna.
Constituents of DNA?
Components of DNA include purine bases and pyrimidine bases (which, when combined, make up base pairs), deoyribose sugars, nucleotides and nucleosides.
