<prompt> Total number of base pairs in human chromosome:3 million3 billion3.3 billion5 million  <response>: Ans: b 3 billion Ref: Harper, 23rd ed, p. 411Total number of base pairs in haploid 23 human chromosome - 3 billion base pairs.Total number of genes - 30,000. Harrison, 386Total number of genes in human chromosome - 1,00,000 genes HarperSome useful tips about structure of nucleotides: Uracil CH3 Methylation - Thymine Uracil NH2 amine - Cytosine 