About This

• REVERSE PARALLELISM: Two polynuclear chains are reverse parallel, with one strand running 5 to 3 and the other strand running 3 to 5 when viewed from one main direction. On the model, it can be seen that there are 5 to 3 chains The oxygen (0) of the deoxyribose on the top is facing upwards, while the other one is facing downwards. (P) is also in the opposite direction.
• MAJOR AND : The appearance of the double has two obvious concave , one large and deep, and the other small and shallow. They are called the major and , respectively.
• BASE PAIRING: The bases on two chains form base pairs through oxygen , and the complementary relationship between base pairs is A‑T, G‑C, and A‑T with three pairs of hydrogen . The red casing on the model represents hydrogen bonding.
• DNA STRUCTURE: DNA molecules are formed by two polynuclear chains spiraling around the same axes with the right hand . The main chain is an alternating arrangement of (P) and deoxyribose (D).
• STRUCTURAL DETAILS: The main chain composed of monosaccharide is located on the outer side of the , the base is located on the inner side, the deoxyribose is parallel to the axes, and the base is basically perpendicular to the axes.