MCQ
In the lac operon which one is responsible for code of repressor ?
- ✓$i$ -gene
- B$z$-gene
- C$y$ -gene
- DDystrophin
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$(A)$ The earliest organisms that appeared on the earth were nongreen and presumably anaerobes.
$(B)$ The first autotrophic organisms were the chemoautotrophs that never released oxygen.Of the above statements which one of the following options is correct?