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Dictionary » N » Nucleotide NucleotideDefinition noun, plural: nucleotides The basic building block of nucleic acids, such as DNA and RNA. It is an organic compound made up of nitrogenous base, a sugar, and a phosphate group.
DNA molecule consists of nucleotides in which the sugar component is deoxyribose whereas the RNA molecule has nucleotides in which the sugar is a ribose. The most common nucleotides are divided into purines and pyrimidines based on the structure of the nitrogenous base. In DNA, the purine bases include adenine and guanine while the pyrimidine bases are thymine and cytosine. RNA includes adenine, guanine, cytosine, and uracil in stead of thymine (thymine is produced by adding a methyl to uracil). Aside from serving as precursors of nucleic acids, nucleotides also serve as important cofactors in cellular signaling and metabolism. These cofactors include CoA, flavin adenine dinucleotide (FAD), flavin mononucleotide, adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADP).
Related terms: nucleotide pyrophosphate transferase. Compare: nucleoside.
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strand biases in mitochondrial genomesThe asymmetric strand biases in the genomes (including mitochondrial) directly impact the nucleotide composition of the genes, thus leading to different amino acid composition of the encoded proteins. As I understand you correctly, you have to search for a STRAND biases ...
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Re: Theories - Origin of Life... Ancestor), a kind of building blocks of astronomic systems, the lost link between the state the world about 4 billion years ago and the first nucleotide at Earth. The theory suggests the DNA as a universal template, called The Matrix/DNA. So, it is not panspermia, only suggesting that there ...
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Re: 3' to 5' Exonuclease question... the cell" the enzyme has both functions of polymerization 5'-3' and exonuclease 3'-5'. They locate in two active site of this enzyme. When a nucleotide is mismatched at polymerase site, the enzyme will stop and the mismatched nucleotide will be removed at exonuclease site. That's also called ...
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