How many DNA molecules a chromosome consists of: a) in the presynthetic period of interphase

How many DNA molecules a chromosome consists of: a) in the presynthetic period of interphase; b) just before cell division? Why does the amount of DNA change at different periods of a cell’s life?

a) The mass of all DNA molecules in the presynthetic will be 6×10 “mg
b) Before cell division, the mass will be 12×10 “mg. During the preparation of the cell for division, the number of DNA molecules in it doubles.

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