write about the basic characteristic of genetic code.
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The genetic code has four main features: Three nucleotides/bases encode an amino acid, there are 20 different amino acids which are the building blocks for proteins. ... The code has no punctuation, so no base serves as a "comma" between groups of bases, therefore the code is read sequencially three bases at a time
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Salient features of genetic code:
- The code is triplet. 61 codons code for amino acids and 3 codons do not code for any AA called stop codons
- It is degenerate. some AA are coded by more than one codon
- No punctuations. Codon is read in contigous fashion.
- Code is nearly universal. eg : bacteria to human UUU code for phenylalanine
- AUG has dual functions. It codes for methionine and also acts as a initiator codon
- UAA UAG UGA are stop / terminator codons.
plz do refer class 12 bio NCERT for more information.....
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