Origins of replication are defined as specific DNA sequences where replication begins. Which statement is NOT true?

• A. They Are Specific DNA Sequences
• B. They Are Where Replication Begins
• C. They Can Be Present in Thousands of Locations in Eukaryotes
• D. They Are Always Part of the Coding Region of Genes

Answer: (D)

Origins of replication are defined as specific DNA sequences where replication begins, recognized by initiator proteins to start copying the genome. The statement that origins are always part of the coding region of genes isn’t correct because these start points are typically found in noncoding DNA—intergenic regions, promoters, introns, or other regulatory sequences. In eukaryotes, there can be thousands of origins scattered across the genome, not confined to coding regions. The essential idea is that the location of an origin is about where replication starts and the DNA sequence it recognizes, not whether that sequence happens to lie within a gene’s coding portion.