How many polypeptide chains are there in \( 1 \mathrm{Hb} \) molecu...

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How many polypeptide chains are there in \( 1 \mathrm{Hb} \) molecule?
(a) \( 2 \alpha \& 2 \beta \)
(b) \( 4 \alpha \)
(c) \( 4 \beta \)
(d) \( 1 \alpha \& 3 \beta \)
\( \mathrm{P} \)
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