Why does DNA form multiple origins of replication along the chromosome during replication?

• A. To allow replication to occur in a single direction along the chromosome.
• B. To ensure that replication occurs only once per cell cycle.
• C. To increase the speed of replication by allowing simultaneous replication at multiple sites.
• D. To prevent the formation of replication bubbles.

Answer: (C)

Verified step by step guidance

1. Understand the structure of DNA: DNA is a double-stranded molecule with a long sequence of nucleotides. In eukaryotic cells, DNA is organized into chromosomes, which are linear structures.
2. Recognize the concept of replication origins: Replication origins are specific sequences in the DNA where replication begins. In eukaryotic cells, there are multiple origins of replication along each chromosome.
3. Identify the purpose of multiple origins: Multiple origins of replication allow the replication process to occur simultaneously at different sites along the chromosome, which significantly speeds up the replication process.
4. Consider the size of eukaryotic chromosomes: Eukaryotic chromosomes are large and complex, so having multiple origins of replication is necessary to ensure that the entire chromosome is replicated efficiently within the time constraints of the cell cycle.
5. Understand the role of replication bubbles: As replication begins at each origin, replication bubbles form, allowing the DNA to be replicated in both directions from each origin, further increasing the speed and efficiency of the replication process.