Final answer:
The start codon, which initiates protein synthesis in DNA, is called the initiation site or the +1 site. It contains the nucleotide sequence AUG (or rarely, GUG).nucleotide sequence AUG (or rarely, GUG).
Step-by-step explanation:
The start codon, which initiates protein synthesis in DNA, is called the initiation site or the +1 site. It contains the nucleotide sequence AUG (or rarely, GUG). This start codon always specifies the amino acid methionine.