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Question
The heme is held in place by a bond between
Options:
A .  the Fe²⁺ and cysteine
B .  the Fe³⁺ and histidine
C .  the Fe³⁺ and cysteine
D .  the Fe²⁺ and histidine
Answer: Option D
Answer: (d).the Fe²⁺ and histidine
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