are tightly coiled strands of DNA found in cells.

Explanation:

chromosomes are tightly coiled strands of DNA found in cells.

Chromosomes are tightly coiled strands of DNA found in cells.

Explanation:

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

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