Which one of the following features is not the property of genetic code?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Codon has punctuations
The genetic code is the set of rules by which the sequence of bases in mRNA decides the sequence of amino acids. Its main features are these. The codon is a triplet. 61 codons code for amino acids and 3 are stop codons. More than one codon can code for the same amino acid. The mRNA is read continuously from the start codon. The code is nearly universal.
(1) Code is degenerate — A property of the genetic code. Some amino acids are coded by more than one codon.
(2) Code is nearly universal — A property of the genetic code. From bacteria to human, UUU codes for phenylalanine. There are a few exceptions, for example in mitochondrial codons.
(3) Codon is triplet — A property of the genetic code. Three bases make one codon.
(4) Codon has punctuations — Not a property of the genetic code. The codons are read one after the other without any gap or comma between them. There are no punctuations.
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