Suppose a bacterial had a mutated repressor protein that could not bind to the lac operator. how ,might this affect regulation of the operon

Transcription of the operon by RNA polymerase would not stop. This would, therefore, keep the genes in the operon activated without repression. β-galactosidase, lactose permease, and lactose transacetylase enzymes would still be produced by the bacteria even in a non-lactose medium.

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estuaries are the partially enclosed coastal bodies of brackish water formed at the mouth of sea where river meets an ocean. it is a transition zone between river and sea water so estuaries are influenced to both marine environment such as tides, waves and to riverine such as flow of fresh water and sediments. the mixing of sea and fresh water provide high level of nutrients, making estuaries a high product habitats.

many estuaries suffers degradation from a variety of human activities like erosion from deforestation, overgrazing, overfishing, drainage and eutrophication.

so from the above statement answers will be

1. false as estuaries are formed due to both brackish and freshwater.

2.true, due to high productivity estuaries are breeding ground for many marine species.

3. direct and indirect activities of man that contribute to pollution and deposition of sediments.