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  2. Purine - Wikipedia

    en.wikipedia.org/wiki/Purine

    Purine is a heterocyclic aromatic organic compound that consists of two rings (pyrimidine and imidazole) fused together. It is water-soluble. Purine also gives its name to the wider class of molecules, purines, which include substituted purines and their tautomers. They are the most widely occurring nitrogen-containing heterocycles in nature. [1]

  3. Purine metabolism - Wikipedia

    en.wikipedia.org/wiki/Purine_metabolism

    Purines are biologically synthesized as nucleotides and in particular as ribotides, i.e. bases attached to ribose 5-phosphate. Both adenine and guanine are derived from the nucleotide inosine monophosphate (IMP), which is the first compound in the pathway to have a completely formed purine ring system.

  4. Nucleotide base - Wikipedia

    en.wikipedia.org/wiki/Nucleotide_base

    Adenine and guanine have a fused-ring skeletal structure derived of purine, hence they are called purine bases. [4] The purine nitrogenous bases are characterized by their single amino group ( −NH 2 ), at the C6 carbon in adenine and C2 in guanine. [ 5 ]

  5. Nucleic acid structure - Wikipedia

    en.wikipedia.org/wiki/Nucleic_acid_structure

    The secondary structure is responsible for the shape that the nucleic acid assumes. The bases in the DNA are classified as purines and pyrimidines. The purines are adenine and guanine. Purines consist of a double ring structure, a six-membered and a five-membered ring containing nitrogen. The pyrimidines are cytosine and thymine. It has a ...

  6. Pyrimidine - Wikipedia

    en.wikipedia.org/wiki/Pyrimidine

    Pyrimidine (C 4 H 4 N 2; / p ɪ ˈ r ɪ. m ɪ ˌ d iː n, p aɪ ˈ r ɪ. m ɪ ˌ d iː n /) is an aromatic, heterocyclic, organic compound similar to pyridine (C 5 H 5 N). [3] One of the three diazines (six-membered heterocyclics with two nitrogen atoms in the ring), it has nitrogen atoms at positions 1 and 3 in the ring.

  7. Basic aromatic ring - Wikipedia

    en.wikipedia.org/wiki/Basic_aromatic_ring

    Typical examples of basic aromatic rings are pyridine or quinoline. Several rings contain basic as well as non-basic nitrogen atoms, e.g. imidazole and purine. In non-basic aromatic rings the lone pair of electrons of the nitrogen atom is delocalized and contributes to the aromatic pi electron system.

  8. Cheap and deadly: Why vehicle terror attacks like the Bourbon ...

    www.aol.com/cheap-deadly-why-vehicle-terror...

    And though Europe has seen many similar attacks − including a truck attack in 2016 that killed 86 and injured 434 - the United States has also seen multiple incidents before Wednesday's attack.

  9. Nucleotide - Wikipedia

    en.wikipedia.org/wiki/Nucleotide

    In humans, pyrimidine rings (C, T, U) can be degraded completely to CO 2 and NH 3 (urea excretion). That having been said, purine rings (G, A) cannot. Instead, they are degraded to the metabolically inert uric acid which is then excreted from the body. Uric acid is formed when GMP is split into the base guanine and ribose.