Which chemical group is most likely to be responsible for an organic molecule behaving as a base (see Concept 2.5)?

Question

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The amino group (-NH2) has a lone pair of electrons, which can accept a proton (H+) and therefore acts as a base. The hydroxyl group (-OH) can act as a base, but it is less likely to than the amino group. The carbonyl group (C=O) and phosphate group (-PO4) are not likely to act as bases.

Which Chemical Group Is Most Likely to Be Responsible for an Organic