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Question

The primary cause of lead's toxicity is its interference with a variety of enzymes because it binds to _______ found on many enzymes.

A
amino group
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B
sulphydryl group
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C
carboxylic group
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D
porphyrin group
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Solution

The correct option is B sulphydryl group
The primary cause of lead's toxicity is its interference with a variety of enzymes because it binds to sulphydryl groups found on many enzymes. Part of lead's toxicity results from its ability to mimic other metals that take part in biological processes, which act as cofactors in many enzymatic reactions, displacing them at the enzymes on which they act.

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