Identify the correct facts about the genetic code.
A. Codon is triplet
B. Codon is nearly universal
C. Code is degenerate
D. Code is ambiguous
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A, B and C only
The genetic code is the set of rules by which the sequence of bases in mRNA decides the sequence of amino acids in a protein.
A. Codon is triplet — Correct. Three bases make one codon. Of the 64 codons, 61 code for amino acids and 3 are stop codons.
B. Codon is nearly universal — Correct. From bacteria to humans, UUU codes for phenylalanine. There are only a few exceptions, such as mitochondrial codons.
C. Code is degenerate — Correct. Some amino acids are coded by more than one codon.
D. Code is ambiguous — Incorrect. The code is the opposite. One codon codes for only one amino acid, so it is unambiguous and specific.
NCERT Extract:
Genetic Code – …
