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    Home > Biochemistry News > Biotechnology News > The characteristics of the genetic code.

    The characteristics of the genetic code.

    • Last Update: 2020-10-25
    • Source: Internet
    • Author: User
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    genetic code has the following basic characteristics: .1) Each cocoon triplet (triplet) determines that a
    amino acid
    ; 2) is separated from the two cocoons without any
    nucleotides
    or other components, i.e. the cocoon does not have a comma;3) the passer-by is directional, e.g. AUC is the cryptopron of Ile, A is the 5' end base, and C is the 3' end base. Therefore, the password is also directional, i.e. the order of nucleotides from the 5' end to the 3' end of mRNA determines the order of amino acids from the N end to the C end in the
    peptide
    chain;4) A cryptic has a degeneracy an amino acid that has several cryptics, or several cryptics that represent an amino acid phenomenon called the simplicity of a cryptic. In addition to the Met and Trp having only one cryptic, all amino acids have more than two codes, such as Arg, which has six.5) There are 64 cophers, of which AUG is not only a met or fMet (in primary nucleocytes), but also a starting signal for peptide chain synthesis, so AUG is the starting crypto. UAA, UAG, and UGA are termination cryptics that do not represent any amino acids, also known as meaningless cryptics.6) The commonality of cryptones is that they all have the same meaning as viruses, primary or ethonalmogenesis.
    but the cocoons in the mitochondrial mRNA of the urn are different from the cocoons in the mRNA in the cytosus: First, the UGA in the mitochondrial does not represent the termination of the cocoon, but encodes Trp;The second is that Mer in the peptide chain is encoded by two cryptides, AUG and AUA, and the Met at the starting point is coded by AUG, AUA, AUU, and AGG;Third, AGA and AGG are not Arg's passwords, but termination passwords, i.e. UAA, UAG, AGA, and AGG are all termination passwords.relationship between the structure of the cryptic substructur and the polarity of the amino acid side chain.1) The polarity of amino acid side chains is in most cases determined by the second base of the cryptic device. When the second base is niacin (Y), the amino acid side chain is non-polar, and when the second base is radon (P), the amino acid side chain is polar.2) When the first base is U or A, the second base is C, and the third base is not specific, the amino acid side chain is determined to be polar without electricity;3) When the first base is not U and the second base is G, the amino acid side chain is charged. In this premise, if the first is C or A, it represents a positively charged amino acid; When the first and second bases are G and A, the amino acids are negatively charged. However, there are some exceptions to the above-mentioned relationship.
    .
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