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The nucleus does have a definite structure, consisting of a double membrane called the nuclear envelope, which encloses the nucleoplasm, chromatin (DNA and proteins), and the nucleolus. While the chromatin can be loosely organized or condensed depending on the cell's activity, the overall architecture of the nucleus is well-defined and essential for regulating gene expression and maintaining genomic integrity. Thus, it is incorrect to say that the nucleus has no definite structure.

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1mo ago

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