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Q.
Which is the unit of DNA?
Chhattisgarh PMTChhattisgarh PMT 2010
Solution:
DNA is bound to proteins in the nucleus forming a complex called chromatin. In a cell that is not dividing, the chromatin is strung out looking like strands of microscopic pearls. But as a cell begins to divide, the DNA coils more tightly around the proteins condensing to form shortened, thickened structure called chromosome.