Thymine is a single-ringed nitrogenous base.
Nitrogenous bases with one ring are called pyrimidines. To help yourself remember this, use the nitrogenous bases A,C,G,T and the number set 2121. Write these two sets one above the other: A C G T/2121. The numbers underneath
letters correspond to the number of rings each base has, so A has 2 rings, and C has 1 ring, etc. You can then use the phrase, CY (c) and THY (t) are PY (pyrimidines) to remember which is which.
Pyrimidines are nucleotides that have a single ring as their nitrogen base. The two pyrimidines are Cytosine and Thymine.
purine
Purines
a single ring structure
DNA does in fact contain cytosine. This is one of the 4 nucleic acids that are found inside of DNA.
Thymine and cytosine are two nitrogen bases found in DNA. DNA is composed of thousands of nucleotides which are composed of one of four nitrogen bases. Both of these nitrogen bases are also pyrimidines, or they have one ring like structure See related link for more info on thymine, cytosine and pyrimidines.
there are double rings in the purine bases and there is only a single ring in the pyrimidine base.
Thymine is a single-ringed nitrogenous base.
Carbon ring structures found in DNA or RNA that contains one or more atoms of nitrogen are called nitrogenous bases. There are five types of nitrogenous bases: Adenine, Thymine, Cytosine, Guanine and Uracil
2 different types of nitrogenous bases: Purine: base w/ double ring of carbon & nitrogen atoms-Adenine (A) & guanine (G) Pyrimidine: single ring of carbon & nitrogen atoms-Cytosine (C) & thymine (T)
These bases are called pyrimidines.
nitrogen base
Purines
a single ring structure
Purines, including adenine and guanine, are double ring structures that make up DNA.
These rings are known as pyrimidines.
pyrimidines
The main chemical structure difference in purines and pyrimidines is purines have a 5 sided C and N based ring as well as a 6 sided C and N based ring structure. Pyrimidines only have the 6 sided C and N based ring structure, also uracil(unmethylated) replaces thymine(methylated) as a pyrimidine in RNA.
DNA does in fact contain cytosine. This is one of the 4 nucleic acids that are found inside of DNA.