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B
Starch metabolism
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C
Lipid metabolism
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D
Protein metabolism
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Solution
The correct option is A Lactose metabolism Lac-operon refers to the group of genes present in bacteria that are responsible for the metabolism of lactose. There are three genes called LacZ, LacY and LacA that code of beta-galactosidase, permease and transacetylase respectively. They have a common promoter, operator and a regulator gene.