A Lac repressor is a tetramer repressed when bound to the inducer. The trp repressor is a ____________________(a) Dimer inactivated when bound to the inducer(b) Dimer activated on inducer binding(c) Tetramer inactivated on inducer binding(d) Tetramer activated on inducer bindingI had been asked this question by my school teacher while I was bunking the class.This is a very interesting question from Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics

A Lac repressor is a tetramer repressed when bound to the inducer. The

1.	A Lac repressor is a tetramer repressed when bound to the inducer. The trp repressor is a ____________________(a) Dimer inactivated when bound to the inducer(b) Dimer activated on inducer binding(c) Tetramer inactivated on inducer binding(d) Tetramer activated on inducer bindingI had been asked this question by my school teacher while I was bunking the class.This is a very interesting question from Operons : Trp topic in division Gene Expression : Transcription Prokaryotes of Cytogenetics
Answer» Correct answer is (b) Dimer activated on INDUCER binding To explain: A trp REPRESSOR is a dimer which can’t bind to the cis ELEMENT unless it is bound to the inducer tryptophan. Only then it undergoes conformational CHANGE such that it then BINDS to the operator.

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