Q.

What is the number of chromosomes in a normal human body cell?

A. 43
B. 44
C. 45
D. 46
Answer» D. 46
Explanation: A chromosome is an organized structure of DNA and protein found in cells. It is a single piece of coiled DNA containing many genes, regulatory elements and other nucleotide sequences. Chromosomes also contain DNA- bound proteins, which serve to package the DNA and control its functions. Human cells have 23 Pairs of chromosomes (22 pairs of autosomes and one pair of sex chromosomes), giving a total of 46 per cell.
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