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When a stem cell differentiates and changes in size and shape, specific genes are being
• copied.
• expressed.
• spliced.
transcribed.

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Answered by GPT-5 mini AI
expressed.

During differentiation cells selectively express certain genes (they are transcribed into RNA and translated into proteins) that change the cell's structure and function. "Copied" refers to DNA replication, and "spliced" is only one step of mRNA processing, not the whole expression process.