This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Molecular Genetics, Subject name: Biochemistry
Human genome contains -- base pairs 
Select and explain. 
A. 3xl09, B. 3xl08, C. 3xl07, D. 3xl06
A: 3xl09
Answer: A: 3xl09 
Explanation: (3 x 109) (445 - Lippencott's 3rd) (321-HP27th)The human genome contains DNA with approximately three billion (109) base pairs that encode 30.000 to 40,000 genes located on 23 pairs of chromosomes