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A pyrimidine always pairs with a purine, so half of the bases will be pyrimidines and half will be purines.

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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.


Will a purine base bond with another purine?

no.because there is not enough space to bind two purine bases.


What is the order ofd the nitrogen bases?

Adenine pairs with Thymine(Double bond) Guanine pairs with Cytosine (Triple Bond) A & G are purine bases and T & C are pyrimidine bases.


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.


If DNA molecule is compared to a spiral staircase what part make up the steps?

pairs of nitrogen bases


When purine base only pairs with a pyrimidine?

This is a basic principle of DNA base pairing called Chargaff's rule. Adenine (purine) pairs with thymine (pyrimidine), while guanine (purine) pairs with cytosine (pyrimidine). This complementary base pairing is essential for the double-stranded structure of DNA.


Purine base that pairs up with thymine and uracil?

Adenine is the purine base that pairs up with thymine in DNA and with uracil in RNA.


What pairs of molecules form the steps in the DNA molecule?

nitrogenous bases


What bond holds purine bases and pyrimidine bases together?

Hydrogen bonds hold purine bases (adenine and guanine) and pyrimidine bases (cytosine, thymine, and uracil) together in DNA and RNA molecules. These hydrogen bonds form between specific pairs of bases, with adenine always pairing with thymine (or uracil in RNA) and guanine always pairing with cytosine.


Is amino acid a double spiral molecule with pairs of nitrogen bases?

No its a DNA


Does Complementary base pairing always pairs a purine with a pyrimidine?

Yes, complementary base pairing in DNA always pairs a purine (adenine or guanine) with a pyrimidine (thymine or cytosine). This specific pairing allows for the formation of hydrogen bonds between the bases, ensuring stability in the DNA double helix structure.