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STD 12 - 5. molecular basis of inheritance — BIOLOGY STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
In an inducible operon, the genes are
  • A
    usually not expressed unless a signal turns them ”on”.
  • B
    usuallyexpressed unless a signal turns them “off”.
  • C
    never expressed
  • D
    always expresser.
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