Final answer:
The continuous gene sequence that starts with a start codon and ends with a stop codon is called an Open Reading Frame (ORF), which is vital for protein synthesis. option d is answer
Step-by-step explanation:
The continuous sequence of a gene that begins with a start codon and ends with a stop codon is commonly referred to as an Open Reading Frame (ORF). This portion of the gene is crucial for the process of protein synthesis as it dictates the sequence of amino acids that will form a protein.
The Open Reading Frame is flanked by regulatory sequences; it initiates at the start codon (AUG), which establishes the reading frame, and it ends at one of the three stop codons that signal termination.
Within a eukaryotic gene, exons are regions that are ultimately expressed and translate into protein, while introns are non-coding sequences that are spliced out during the mRNA processing. option d is answer