DNA Structure Model, Plastic Educational DNA Double Model with 10A Diameter and 18A Pitch, for Teaching Biology in High Schools and Universities

Specification: Item Type: DNA Structure Model Material: Plastic Model Structure: 1. Double ​>​​ with a diameter of 10A; 2. Pitch 18A, distance between adjacent base pairs 1.8A; 3. The difference in direction of adjacent bases is 360; 4. 6 pairs of base pairs per pitch; 5. The hydrogen ​​ length is 1.0-2.5A. Application: The product meets the national standard JY35 81 "DNA Structure Model Technical Conditions" produced by ​​ of Education, and is suitable for teaching biology as a basic course in ordinary high schools and universities. Package List: 1 x Model

• DNA STRUCTURE: DNA molecules are formed by two polynuclear glycine chains spiraling around the same axes with the right hand . The main chain is an alternating arrangement of (P) and deoxyribose (D).
• REVERSE PARALLELISM: Two polynuclear glycine 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.
• 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.
• 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.
• MAJOR AND GROOVE: The surface of the double has two obvious concave grooves, one large and deep, and the other small and shallow. They are called the major and groove, respectively.