Question

Human genome contains about

• A. 10,000 nucleotides
• B. 10,000 genes
• C. 6 billion nucleotides
• D. 6 billion genes

Answer 1

The correct option is C 6 billion nucleotides

A genome can be defined as an organism's complete set of deoxyribonucleic acid (DNA). DNA molecules are made of two twisting, paired strands. Each strand is made of four chemical units, called as nucleotide bases. The bases are adenine (A), thymine (T), guanine (G) and cytosine (C). Bases on opposite strands pair specifically; an A always pairs with a T, and a C always with a G.

The human genome contains approximately 3 billion of these base pairs, which reside in the 23 pairs of chromosomes within the nucleus of all our cells. Each chromosome contains hundreds to thousands of genes, which carry the instructions for making proteins. Each of the estimated 30,000 genes in the human genome makes an average of three proteins.