In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are , and those encoding the enzymes of a catabolic pathway (such as the lac operon) are .

inducible; repressible

permanently on; permanently off

permanently off; permanently on

easily mutated; resistant to mutations

repressible; inducible

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Master Review of the Lac Operon & Trp Operon with a bite sized video explanation from Jason Amores Sumpter

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In general, operons that encode the enzymes of a biosynthetic (anabolic) pathway (such as the trp operon) are __________, and those encoding the enzymes of a catabolic pathway (such as the lac operon) are __________.