52. There are 61 mRNA codons that specify an amino acid, but only 45 tRNAs. This is best explained
by the fact that
(A) some tRNAs have anticodons that recognize two or more different codons.
(B) the rules for base pairing between the third base of a codon and tRNA are flexible.
(C) inosine can hydrogen-bond with G, C, U or A.
(D) A and B are true.
(E) A, B, and C are true.
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