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

question 31

Multiple Choice

There are 61 codons that each specify the addition of a specific amino acid,and three 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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