Question

Genetic code includes -

• A. 3 nucleotide bases, 64 codons.
• B. 3 nucleotide bases, 18 codons.
• C. 2 bases, 32 codons.
• D. 2 bases, 64 codons.

Answer 1

The correct option is A 3 nucleotide bases, 64 codons.

Genetic code is a combination of three nucleotides on the mRNA. This group of three is called a triplet or codon. Each triplet codes for one amino acid. Since, there are 20 amino acids and 4 Nitrogen bases, the number of codons required are $4^3$ = 64 to represent all the amino acids.

So ,the correct answer is '3 nucleotide bases, 64 codons.'