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Questions with Answers- Proteins & Enzymes

Questions with answers - Proteins & Enzymes A. A peptide with 12 amino acids has the following amino acid composition: 2 Met, 1 Tyr, 1 Trp, 2 Glu, 1 Lys, 1 Arg, 1 Thr, 1 Asn, 1 Ile, 1 Cys Reaction of the intact peptide with fluorodinitrobenzene followed by acid hydrolysis creates a derivative of Ile. A specific cleavage of the intact peptide produces fragments with the following sequences: Glu-Cys-Asn-Met-Lys Met-Glu-Thr-Arg-Trp Ile-Tyr ( Questions 1-5) Which reagent was used for the specific cleavage? a) chymotrypsin b) trypsin c) V8 protease d) cyanogen bromide Which amino acids would be released when the intact peptide was treated first with V8 protease followed by treatment with cyanogen bromide? a) Glu and Met b) Glu and Lys c) Met and Lys d) Glu, Met, and Lys Which treatment would result in the release of Lys and Arg from the intact peptide?

b) They both have closely related primary, secondary, tertiary, and quaternary structures. c) They both are composed of multiple subunits each of which contains a heme prosthetic group. d) They both have similar molecular weights and bind one oxygen molecule per protein molecule. 21._____ Which is a property of protein tertiary structure?

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