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Gala2k [10]
3 years ago
9

The name for continents in one landmass surrounded by gigantic ocean

Biology
1 answer:
andre [41]3 years ago
7 0
A Pangaea...Hope This Helped U ♡
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2 years ago
Which types of mutations in the lac operon stop Escherichia coli from utilizing lactose as a carbon source? a) promoter deletion
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D.) repressor DNA-binding site mutation

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lacl prevents the repressor polypeptide is a mutant that prevent operon from binding lactose, and thus will bind to the operator and be non-inducible.. This mutant will represses the lac operon whether lactose is present or not and the lac operon will not be expressed. It is also called“super-supperesor".

The lacI locus – One type of mutant allele of lacI (callled I-) prevents the production of a repressor polypeptide or produces a polypeptide that will not allow to bind to the operator sequence.

This is also a constitutive expresser of the lac operon because absence of repressor binding permits transcription.

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