In Bacteria, There Are 61 MRNA Codons That Specify an Amino

question 7

Multiple Choice

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 recognise 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 recognise them are dispensable.
• D) The DNA codes for all 61 tRNAs, but some are then destroyed.

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