Which of these Lac operon mero- diploid will be constitutively turned on? Considering the terms has their usual meaning.(a) I^+ + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(b) I^+ + P + O^C + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(c) I^s + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(d) I^+ + P + O^+ + Z^+ + Y^+ + A^+ / I^– + P+ O^+ + Z^+ + Y^+ + A^+The question was posed to me in semester exam.My question is from Operons : Lac and Ara in portion Gene Expression : Transcription Prokaryotes of Cytogenetics

Which of these Lac operon mero- diploid will be constitutively turned

1.	Which of these Lac operon mero- diploid will be constitutively turned on? Considering the terms has their usual meaning.(a) I^+ + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(b) I^+ + P + O^C + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(c) I^s + P + O^+ + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+(d) I^+ + P + O^+ + Z^+ + Y^+ + A^+ / I^– + P+ O^+ + Z^+ + Y^+ + A^+The question was posed to me in semester exam.My question is from Operons : Lac and Ara in portion Gene Expression : Transcription Prokaryotes of Cytogenetics
Answer» The correct ANSWER is (b) I^+ + P + O^C + Z^+ + Y^+ + A^+ / I^+ + P+ O^+ + Z^+ + Y^+ + A^+ The explanation: O^C is an operon that can’t bind to the repressor. Consecutively it is always turned on. I^S produces a repressor which binds tightly to operon and never lets it turn on- This is the CASE of constitutively turning off.

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