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The answer is "a" . DNA is in the form of uncoiled, untwisted mass dispersed throughout the nucleus (chromatin) in a working cell. The DNA in the figure above is represented as red and blue filaments. When the cell undergoes cell division the DNA will coil and twist to form short thick structures called chromosomes.

In your notes sketch a diagram of two nuclei contrasting between (a) chromatin and (b) chromosomes. Include six DNA molecules in sketch (a). Include six chromosomes in sketch (b).

Compare your sketch with the following figure. Click here to check your answer.