Nitrogen-containing molecules {base, nucleic acid} {nitrogenous base} can be purine or pyrimidine: adenine, guanine, cytosine, thymine in DNA, or uracil in RNA.
Rather than uracil, similar nucleotides {thymine} can be in DNA, because cytosine can deaminate to become uracil and so change DNA template too easily. If DNA cytosine deaminates, enzymes remove new uracils and replace with cytosine to repair chain.
Bonding uracil and three phosphate groups {uridine triphosphate} (UTP) can carry energy in phosphate bonds. Magnesium or calcium ions attach to phosphates, so ATPs have neutral charge.
5-Chemistry-Biochemistry-Nucleic Acid-Nucleotide
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Date Modified: 2022.0225