There Are 61 Codons That Each Specify the Addition of a Specific

question 58

Multiple Choice

There are 61 codons that each specify the addition of a specific amino acid, and 3 stop codons for which there is no corresponding amino acid. However, there are only about 40 tRNA molecules, representing 40 anticodons. How is that possible?

• A) Only about 40 of the recognized 61 codons are present in mRNA.
• B) An anticodon forms hydrogen bonds with the codon; it must match the first two bases of the codon but is less specific with respect to the third base.
• C) There are tRNAs that can bind one of two related amino acids.
• D) Only 20 of the codons are active-one for each amino acid.

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