AP BIOLOGY

Detailed explanation-1: -Each end of DNA molecule has a number. One end is referred to as 5’ (five prime) and the other end is referred to as 3’ (three prime). The 5’ and 3’ designations refer to the number of carbon atom in a deoxyribose sugar molecule to which a phosphate group bonds.

Detailed explanation-2: -The ends of DNA strands are called the 5′(five prime) and 3′ (three prime) ends. The 5′ end has a terminal phosphate group and the 3′ end a terminal hydroxyl group. One of the major structural differences between DNA and RNA is the sugar, with the 2-deoxyribose in DNA being replaced by ribose in RNA.

Detailed explanation-3: -DNA and RNA are composed of nucleotides that are linked to one another in a chain by chemical bonds, called ester bonds, between the sugar base of one nucleotide and the phosphate group of the adjacent nucleotide. The sugar is the 3’ end, and the phosphate is the 5’ end of each nucleiotide.