Home › MHT-CET › Biology › Molecular Basis of Inheritance › How many codons in the standard genetic code (a)…
How many codons in the standard genetic code (a) total exist, (b) are stop codons, (c) code for amino acids?
A64 total, 3 stop, 61 sense codons
B20 total, 0 stop, 20 sense
C64 total, 1 stop, 63 sense
D20 total, 3 stop, 17 sense
Answer & Solution
Correct answer: A. 64 total, 3 stop, 61 sense codons
Of 4³ = 64 possible triplets: 3 are stop codons (UAA, UAG, UGA); the remaining 61 code for the 20 amino acids — hence **degeneracy** (multiple codons per amino acid).
Related questions
In eukaryotes, primary mRNA transcript becomes mature mRNA afterThe 'one gene - one polypeptide' concept was proposed byIn prokaryotes, the small ribosomal subunit recognises the mRNA initiation site via theIn humans, the percentage of A in a DNA sample is 30 %. By Chargaff's rule, the percentageTranscription differs from replication in that itThe genetic code is described as degenerate becauseOkazaki fragments are formed on theDuring DNA replication, the enzyme that unwinds the double helix is