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16 Σεπ 2023 · Adenine and guanine are the two primary purines found in nucleic acids (DNA and RNA). Purines are essential for a variety of cellular processes, including DNA and RNA synthesis, energy storage and transfer through molecules like ATP, and signal transduction as secondary messengers (cAMP).
24 Νοε 2023 · draw the general structure of a nucleotide and a nucleoside. indicate the nitrogen atom by which a given purine or pyrimidine base attaches to the sugar component in nucleotides and nucleosides. sketch a section of nucleic acid to show how the nucleotide units are joined together.
4 Δεκ 1997 · Pyrimidines from nucleic acids or the energy pool are acted upon by nucleotidases and pyrimidine nucleoside phosphorylase to yield the free bases. The 4-amino group of both cytosine and 5-methyl cytosine is released as ammonia.
Hydrogen bonding and base stacking interactions of substituted purines are important for stabilizing the three-dimensional structure of nucleic acids. The most important biological substituted purines are adenine and guanine, which are the major purine bases found in RNA and DNA.
Adenine and guanine are the major purines found in nucleic acids (Figure 9.1.2 9.1. 2). The formation of a glycosidic bond between C1′ of the pentose sugar and N1 of the pyrimidine base or N9 of the purine base joins the pentose sugar to the nitrogenous base. In the formation of this bond, a molecule of water is removed.
A nucleotide is composed of a nitrogenous base, deoxyribose (five-carbon sugar), and at least one phosphate group. The nitrogenous bases are purines such as adenine (A) and guanine (G), or pyrimidines such as cytosine (C), thymine (T), and uracil (U).
23 Αυγ 2021 · The nitrogenous bases found in nucleic acids include adenine and guanine (called purines) and cytosine, uracil, or thymine (called pyrimidines). There are two sugars found in nucleotides - deoxyribose and ribose (Figure 2.128). By convention, the carbons on these sugars are labeled 1’ to 5’.
