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24-02-2020
Biology

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Which step happens first to a chromosome during cell division?
A. Nucleotides are added to each half of a DNA molecule.
B. A DNA molecule unwinds, exposing the bases on each half.
C. Each half of a DNA molecule acts as a template.
D. Two identical DNA molecules form.

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11-02-2022

(b) a dna molecule unwinds, exposing the bases on each half

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