Question

select the correct answer. why do you think the eukaryotic dna requires multiple origins of replication? a. multiple origins help make more copies of the same dna simultaneously. b. eukaryotic organisms have unique dna strands for each specialized cell. c. eukaryotes do not have topoisomerase, so multiple origins are created due to tension from unwinding of dna strands. d. eukaryotic dna is much larger and replication at multiple origins helps reduce the time required for whole genomes to replicate. e. multiple origins of replication ensure that there are no lagging strands and replication takes place at the same pace.

Explanation:

• Option A: Replication is for cell division, not making more copies simultaneously in the same cell context, so A is wrong.
• Option B: All cells of a eukaryote have the same DNA (except some like red blood cells), so B is wrong.
• Option C: Eukaryotes do have topoisomerase, so C is wrong.
• Option D: Eukaryotic DNA is large (e.g., human genome). Having multiple origins allows replication to start at many points, reducing the total time to replicate the entire genome, which is correct.
• Option E: Lagging strands are inherent in DNA replication (due to 5’-3’ synthesis direction), and multiple origins don't eliminate them, so E is wrong.

Answer:

D. Eukaryotic DNA is much larger and replication at multiple origins helps reduce the time required for whole genomes to replicate.