NEET BIOLOGY

Detailed explanation-1: -A nucleotide is the basic building block of nucleic acids (RNA and DNA). A nucleotide consists of a sugar molecule (either ribose in RNA or deoxyribose in DNA) attached to a phosphate group and a nitrogen-containing base.

Detailed explanation-2: -Deoxyribonucleic acid (DNA) is made up of sugar, a nitrogenous base and a phosphate group (Figure 1.2). The combination of these molecules makes the building blocks for the DNA synthesis.

Detailed explanation-3: -The basic unit of a nucleic acid is a nucleotide. It is formed by a nitrogenous base, a sugar and a phosphate group. The nitrogenous bases that bind to the sugar are of two types; purines consisting of adenine and guanine and pyrimidines consisting of cytosine, thymine in DNA and uracil in RNA.

Detailed explanation-4: -A nucleotide is the building block of nucleic acids (a type of macromolecule). It is made up of three main parts: phosphate group(s), pentose sugar, and a nitrogenous base (adenine, thymine, guanine, cytosine, or uracil).

Detailed explanation-5: -Phosphate Backbone Attached to each sugar is one of four bases–adenine (A), cytosine (C), guanine (G), or thymine (T). The two strands are held together by bonds between the bases, with adenine forming a base pair with thymine, and cytosine forming a base pair with guanine.