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Identify the incorrectly paired item.

1. Insulin – steroid hormone
2. Estrone – regulates the uterine cycle in females
3. Oxytocin – causes uterine contraction
4. Potassium metabisulphite – used as a food preservative

Correct answer: Insulin – steroid hormone

Solution

Insulin is a polypeptide (protein) hormone, not a steroid hormone, so 'Insulin - steroid hormone' is the incorrectly paired item. The other pairings (estrone, oxytocin, potassium metabisulphite) are correct.

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