A nucleoside is the nitrogenous base bound to a sugar via glycosidic bond. A nucleotide is a nitrogenous base bonded to a sugar bonded to the phosphate. This nitrogenous base is cytosine. If it were bound to ribose, it would be called cytidine. Although cytosine is a pyrimidine like uracil and thymine, pyrimidine is a class of ring structure, not the specific name of a base.

Think of it as this. CUT the PY (pie) PYrimidines. PURe As Gold. PURines. A will pair with T (and U in RNA). G will pair with C. The deamination of cytosine makes uracil, which is in RNA.

The 80S eukaryotic ribosome is made up of 40S and 60S subunits.

This nitrogenous base is adenine. Although it has a purine ring system, purine is not its specific name. If the adenine were bound to a sugar, it would be called adenosine.

The six-membered ring is a pyrimidine. The purine ring system has two rings: a six-membered and a five-membered ring. These aromatic rings are hydrophobic, making them relatively insoluble. The pyrimidine bases in nucleotides are cytosine, uracil, and thymine; the purine bases in nucleotides are adenine and guanine.

Pyrimidines are nitrogenous bases with 1 ring structure, whereas purines are nitrogenous bases with 2 ring structures. Cytosine and thymine are pyrimidines since they both have one ring structure, whereas adenine and guanine are purines with two connected ring structures. (Note: in RNA, uracil would be considered a pyrimidine in the place of thymine.) One way to help you remember which bases belong to which chemical groups, remember that pyrimidines, like pyramids are sharp, and sharp things CUT - Cytosine, Uracil, and Thymine.

The structure is adenine because of the characteristic amine group on carbon 6 and lack of any other substituents.

DNA and RNA molecules contain four types of nitrogenous bases. Guanine, cytosine and adenine are found in both whereas thymine is only found in DNA and uracil is only found in RNA. This means that DNA molecules will have more Thymine bases than RNA molecules. Another difference between DNA and RNA molecule is the type of pentose sugar. RNA contains ribose sugar whereas DNA contains deoxyribose. Deoxyribose contains one less hydroxyl group than ribose; therefore, DNA molecules have more deoxygenated sugars than RNA.

Thymine is the nitrogenous base that is only found in DNA. All of the other bases can be found in both DNA and RNA.

While adenine is the name of this nitrogenous base of the purine family, when bonded to ribose, a nucleoside is formed. This nucleoside is called adenosine. A nucleoside consists of a nitrogenous base and a pentose sugar (either ribose or deoxyribose). A nucleotide consists of a nitrogenous base, a pentose sugar, and at least one phosphate group.