試題詳解

複選題
28. In bacteria, there are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. Which of the following statements explains this fact?
(A) Some tRNAs have anticodons that recognize four or more different codons.
(B) The rules for base pairing between the third base of a codon and tRNA are flexible.
(C) Many codons are never used, so the tRNAs that recognize them are dispensable.
(D) The DNA codes for all 61 tRNAs, but some are then destroyed.