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The following metal ion activates many enzymes, participates in the oxidation of glucose to produce ATP and with Na, is responsible for the transmission of nerve signals.

1. Copper
2. Calcium
3. Potassium
4. Iron

Correct answer: Potassium

Solution

Potassium (K⁺) is essential for enzyme activation, ATP production during glucose oxidation, and works with sodium (Na⁺) in nerve signal transmission.

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