The double helix structure of DNA plays a crucial role in facilitating its replication during cell division. This structure consists of two complementary strands that are held together by hydrogen bonds between the nitrogenous bases. Each strand serves as a template for the synthesis of a new complementary strand, ensuring the accurate replication of genetic information. The process of DNA replication involves several key components, including nucleotides, base pairing, and DNA polymerase.1. Nucleotides: Nucleotides are the building blocks of DNA, consisting of a sugar molecule deoxyribose , a phosphate group, and a nitrogenous base. There are four types of nitrogenous bases in DNA: adenine A , guanine G , cytosine C , and thymine T . These nucleotides are essential for the synthesis of new DNA strands during replication.2. Base pairing: The double helix structure of DNA is stabilized by hydrogen bonds between the nitrogenous bases of the two strands. These bases pair specifically, with adenine always pairing with thymine A-T and guanine always pairing with cytosine G-C . This specific base pairing, known as complementary base pairing, ensures that the genetic information is accurately copied during replication. When the two strands of DNA separate, each strand serves as a template for the synthesis of a new complementary strand, following the base pairing rules.3. DNA polymerase: DNA polymerase is an enzyme that plays a central role in the process of DNA replication. It catalyzes the addition of nucleotides to the growing DNA strand, using the template strand as a guide. DNA polymerase can only add nucleotides to the 3' end of the growing strand, so replication proceeds in the 5' to 3' direction. The enzyme also has proofreading capabilities, which allows it to correct errors in base pairing, ensuring the fidelity of DNA replication.In summary, the double helix structure of DNA facilitates its replication during cell division by providing a template for the synthesis of new complementary strands. Nucleotides serve as the building blocks for the new strands, while base pairing ensures the accurate replication of genetic information. DNA polymerase plays a crucial role in catalyzing the addition of nucleotides and maintaining the fidelity of DNA replication.