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In the bones, the calcium and phosphate ions are organized in which biological structure?

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In the bones, the calcium and phosphate ions are organized in which biological structure?

(a) Tetrahedral

(b) Hydroxyapatite

(c) Clustered

(d) Random

I got this question in an interview.

My question is from Fractures topic in section Orthopaedics of Clinical Science

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The correct answer is (b) Hydroxyapatite

Best explanation: The chemical formula of hydroxyapatite is Ca10(PO4)6(OH)2. The organization of this molecule is such that it provides strength and support to the structure. Shells of various marine animals are also arranged in this manner which helps them bear the tremendous pressure of the sea.

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