How do the four different types of bases in DNA (ATCG) pair?

Explanation:

Thymines always pairs with Adenines

Guanines is always paired with Cytosines

All bases are located inside the double helix. Outside on the right and left of the double helix lies sugar molecules (deoxyribose) and phosphate molecules.

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Elements that are metals tend to lose electrons and become positively charged ions called cations. Elements that are nonmetals tend to gain electrons and become negatively charged ions called anions. Metals that are located in column 1A of the periodic table form ions by losing one electron.