Final answer:
A tRNA with the anticodon 3'-ACC-5' normally carries the amino acid threonine, but a modification might cause a mismatch with the standard genetic code.
Step-by-step explanation:
The amino acid carried by a tRNA with the anticodon 3'-ACC-5' corresponds to the mRNA codon 5'-UGG-3', which codes for the amino acid tryptophan. However, since the anticodon is 3'-ACC-5', it has been modified from its standard pairing, suggesting an error or artificial modification. In a normal cell, a tRNA with the anticodon specified would pair with a complementary codon for an amino acid, and the transfer RNA (tRNA) molecule delivers this specific amino acid during translation.
Every tRNA molecule has an anticodon that is complementary to the mRNA codon for an amino acid it transports. For example, if the amino acid lysine has the codon AAG, then the tRNA with the anticodon UUC will carry lysine. An important note is that the anticodon-codon pairing always follows the standard genetic code rules, so any aberrations like a modified tRNA would typically be anomalous.
Therefore, which amino acid a tRNA with the anticodon 3'-ACC-5' normally carries, that would be threonine. In the context provided, there appears to be a mismatch or intentional modification, thus suggesting that the transport of amino acids by tRNA can be altered experimentally or by errors in the tRNA-synthetase recognition process.