Choose the correct answers from the alternatives given :
Which of the following is not true of a codon?

It extends from one end of a tRNA molecule

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It never codes for more than one amino acid

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It may code for the same amino acid as another codon does

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It consists of three nucleotides

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Solution

The correct option is A It extends from one end of a tRNA molecule
A codon is the shortest sequence that consists of only three nucleotide bases. Each codon codes for only one amino acid. This means codons are universal in nature and will code for the same amino acid in all organisms.
A particular amino acid can be coded by more than one codon. Example: Arginine is coded by six codons CGU, CGC, CGA, CGG, AGA, and AGG.
The codons are continuous and commaless in nature.
So, the correct option is 'It extends from one end of a tRNA molecule'.

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