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What is the primary reason the signaling molecule is not received by every cell nucleus? Option 1: Cell nuclei have varying sizes. Option 2: The signaling molecule is too large. Option 3: Not all cells have receptors for the molecule. Option 4: The molecule is rapidly degraded.

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Answer:

3. Not all cells have receptors for the molecule.

The main reason a signaling molecule is not receive by every cell nucleus is that not all cells have receptors for that particular molecule. Cells have specific receptors on their surface to recognize and respond to their corresponding signaling molecule. Cells that lack the specific receptors for a given signaling molecule will not respond to it, regardless of the size of the cell nuclei or other factors such as the stability of the molecule itself.

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