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There are a group of promoters from the genes for metallothioneins. These are a group of proteins rich in ______ residues.

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There are a group of promoters from the genes for metallothioneins. These are a group of proteins rich in ______ residues.

(a) cysteine

(b) methionine

(c) either cysteine or methionine

(d) cysteine and methionine both

I had been asked this question in semester exam.

The above asked question is from Cultured Cells in Mammals and Restricted Areas in Intact Organisms in section Using Other Organisms of Genetic Engineering

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The correct choice is (a) cysteine

Best explanation: These are rich in cytseine residues which chelate heavy metals to reduce their toxicity. The promoter is induced by treatment of cells with heavy metal ions such as zinc and cadmium.

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