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It depends on the context. In a biological context, pyrimidines are the nucleotides with a single ring in the nitrogenous base. These include thymine and cytosine in DNA and uracil and cytosine in RNA.

In an organic chemistry context, the answer is longer.

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What kind of structure do pyrimidine base have?

A single-ring structure


Purine nucleotides mainly differ from pyrimidine nucleotides in their number of?

Purine nucleotides differ from pyrimidine nucleotides in their structure due to the number of nitrogen-containing rings they have. Purine nucleotides have a double-ring structure, while pyrimidine nucleotides have a single-ring structure.


What are a purine and a pyrimidine that are capable of hydrogen bonding to form the rung structure of DNA called?

Adenine (purine) can hydrogen bond with thymine (pyrimidine), and guanine (purine) can hydrogen bond with cytosine (pyrimidine) to form the rungs of the DNA double helix structure.


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.


What is transversion mutation?

A transversion mutation is a type of point mutation where a purine base is substituted for a pyrimidine, or vice versa. This type of mutation results in a change in the base pair from a double-ring structure to a single-ring structure, potentially causing changes in the amino acid sequence during protein synthesis.


What was Watson and cricks proposed structure of DNA?

James D. Watson discovered the pattern structure of DNA with Francis Crick. A purine and a pyrimidine


What is an anilinopyrimidine?

An anilinopyrimidine is any of a class of fungicides whose structure is based on a pyrimidine ring with an aniline substituent.


What strand of mRNA from DNA is replaced by adenine?

It's not a strand that is replaced, but a nitrogen base, much like adenine. The pyrimidine thymine is replaced by another pyrimidine uracil.


What does a filovirus look like?

a rod like structure


What type of rings do purines have?

Purines have two rings in their structure: a pyrimidine ring fused to an imidazole ring.


What is pyrimidine based in DNA?

Cytosine and thymine are the pyrimidine bases in DNA.


When a purine base only pairs with a pyrimidine what is it called?

When a purine base pairs with a pyrimidine, it forms a complementary base pair. This pairing is important in the structure of DNA molecules, where adenine pairs with thymine and guanine pairs with cytosine through hydrogen bonding, creating the double helix structure of DNA.