Which of the Following Best Explains the Observation That in Bacteria

question 35

Multiple Choice

Which of the following best explains the observation that in bacteria, there are 61 mRNA codons that specify an amino acid, but only 45 tRNAs?

• 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 61 tRNAs, but some are destroyed after transcription.

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