A hemoglobin molecule contains: 1) four iron ions and four a subunits that are linked by an

A hemoglobin molecule contains:

 

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1) four iron ions and four a subunits that are linked by an extensive interface, which includes the carboxyl terminus of each chain. 2) four iron ions. 3) two a subunits that are connected to two ß subunits via disulfide bonds 4) both alpha helices and beta sheets. 5) four a subunits that are linked by an extensive interface, which includes the carboxyl terminus of each chain. 1) four iron ions and four a subunits that are linked by an extensive interface, which includes the carboxyl terminus of each chain. 2) four iron ions. 3) two a subunits that are connected to two ß subunits via disulfide bonds 4) both alpha helices and beta sheets. 5) four a subunits that are linked by an extensive interface, which includes the carboxyl terminus of each chain.

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