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Question

Which of these is a phosphoprotein?

A
Ferritin
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B
Casein
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C
Mucin
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D
Albumin
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Solution

The correct option is B Casein
Casein is a milk protein. It is a phosphoprotein as because it has phosphorous as a conjugated group. 82% of the milk protein is casein and rest 12 % is whey protein. It is acted upon by the renin enzyme and gets converted into paracasein by the process of coagulation. It contains a high number of proline residues.
So, the correct answer is option B.

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