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Biomolecules
Nucleic Acids and the Genetic Code
1 question from 1 paper, each with its answer.
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Concepts tested
- Triplet codon
All Questions
2004 AIPMT 1 question
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A sequence of how many nucleotides in messenger RNA makes a codon for an amino acid :-The genetic code is a triplet code: a sequence of three consecutive nucleotides (bases) on mRNA codes for one amino acid. This group of three is called a codon.
There are 4 bases (A, U, G, C). Codons of one base would give only $4^1 = 4$ combinations and codons of two bases only $4^2 = 16$, which are fewer than the 20 amino acids.
Codons of three bases give $4^3 = 64$ combinations, which is enough to code all 20 amino acids along with start and stop signals.
So a sequence of three nucleotides makes a codon.