AP BIOLOGY

Detailed explanation-1: -The statement that the start codon in translation is a codon for the amino acid methionine is True. The initiation of translation occurs with the help of the AUG codon. The AUG codon codes for the amino acid Methionine and that acts as the start codon for translation.

Detailed explanation-2: -The start codon in all mRNA molecules has the sequence AUG and codes for methionine. Next, the large ribosomal subunit binds to form the complete initiation complex. During the elongation stage, the ribosome continues to translate each codon in turn.

Detailed explanation-3: -The amino acid threonine can be translated from four RNA codons ACU, ACC, ACA, and ACG.

Detailed explanation-4: -The codon for Methionine; the translation initiation codon. Usually, protein translation can only start at a Methionine codon (although this codon may be found elsewhere within the protein sequence as well). In eukaryotic DNA, the sequence is ATG; in RNA it is AUG.

Detailed explanation-5: -The anticodon I-G-U, according to the wobble hypothesis, is expected to recognize A-C-U, A-C-C and A-C-A, 3 out of the 4 codons for threonine.