Amutation occurs in an operon that prevents the transcription factor from binding to its recognition site on the dna. in which type(s) of gene regulation would this mutation result in constitutive expression of the structural gene? select one or more: negative inducible negative repressible positive inducible positive repressible

The answer is negative inducible and positive repressible. This is because, since the gene is constitutive, it is always transcribed unless repressed. It is also structural because it codes for enzymes or proteins that are non-regulatory. The fact that transcription factors cannot bind to the promoter means it cannot be transcribed (hence also repressed by the mutation).

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.