A small peptide was found to contain equimolar amounts of the following amino acids: arginine, glutamic acid, glycine, lysine, methionine and phenylalanine. Individual samples of the peptide were treated with the following agents with the results noted: Reagent Specificity Trypsin Lys, Arg (C) Chymotrypsin Phe, Trp, Tyr (C) Staphylococcus V8 protease Glu, Asp (C) Pepsin Phe, Trp, Tyr (N) Cyanogen bromide Met (C) a) trypsin: arginine and a pentapeptide b) cyanogen bromide: two tripeptides c) S. aureus V8 protease: lysine and a pentapeptide d) chymotrypsin: a dipeptide and a tetrapeptide, with the latter showing absorbance at 280nm. What is the primary structure of the peptide? Explain each piece of evidence given and the reasoning that led to your answer.

thats not even an aswer choice

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.