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Which statement indicates one difference between the gene that codes for insulin and the gene that codes for testosterone in humans? The gene for insulin has different sequence of molecular bases than the gene for testosterone.
The reason is that in humans only 20 amino acids (except selenocysteine) are involved in translation. Therefore, one amino acid can be encoded by more than one mRNA codon-triplet. Arginine and leucine are encoded by 6 triplets, isoleucine by 3, methionine and tryptophan by 1, and all other amino acids by 4 or 2 codons. The redundant codons are typically different at the 3rd base. Table 2 shows the inverse codon assignment, i.e. which codon specifies which of the 20 standard amino acids involved in translation. Table 1.