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- which of the following is correct about the structure of proteins? a- the number of peptide bonds is equivalent to the number of amino acid residues b- the secondary structure of proteins are mostly stabilized by hydrophobic interactions c- protiens mostly composed of polar amino acids will have an elongated (fibrous) tertiary structure d- the quaternary structure of a protein is formed between or among similar polypeptides only1.Describe in detail how to determine the primary structure of protein. 2.You have been given a mixture of lysine, histidine and cysteine.The isoelectric point of the amino acids are as follows; histidine 7.64 lysine:9.74 cysteine:5.02 Show how you will separate the mixture into the pure forms. State and describe any instrument that you will use to separate the components in the mixture.Which of the following statements is/are TRUE for globular proteins? A. sensitive to changes in pH & heat B. regular amino acid sequence C. soluble in water D. structural role
- Which of the following most directly applies to the formation of the secondary structures of proteins? A B с D formation of ionic bonds between the R groups of two polypeptides formation of nonpolar interactions between two R groups on the same polypeptide formation of covalent bonds via dehydration reactions between two amino acids formation of hydrogen bonds between between amino and carboxyl groups1. What is the empirical formula for all carbohydrates? 2.Denaturation affects which aspect of a protein's structure? i Primary structure ii Secondary structure iii Tertiary structure iv Quaternary structure i only i and ii only ii, iii and iv ii and iv only20. Which of the following does NOT contribute to the tertiary structure of proteins? a. salt bridges Ob. hydrogen bonds C. disulfide bonds d. peptide bonds
- 4. Tertiary structure of a protein describes: A. Sequence of amino acids B. Location of disulphide bonds C. Amino terminal end amino acid D. The nature of protein folding 5. Study of linear sequence of amino acids is done by all techniques listed except: A. End group analysis B. Hydrolysis by proteolytic enzymes C. Analyzing the content of each aminOacid D. Denaturing the protein 6. Primary structure decides: A. Rate of synthesis of protein B. Biological activity of the protein C. Rate of degradation of the protein D. Effect of proteolytic enzymes on proteinWhich of the following statement about quaternary structure of protein is correct? Select one: a. Quaternary structure is a force between different polypeptides. b. Hydrogen bond is an only force found in quaternary structure. c. Quaternary structure contains one polypeptide. d. Quaternary structure is an unfolded form of protein.5. What kind of bonds form the primary structure of protein? A. Hydrogen bonds B. Peptide bonds C. Ionic bonds D. Hydrophobic interactions E. Phosphodiester bonds 0.00
- 3c) The 3 structure of a protein incorporates any 2 structure the protein has, but results primarily from interactions between amino acid side groups. Name two different amino acids whose side groups could participate in each type of interaction given below under physiological conditions (pH 7.2-7.5). Ionic bonding: Hydrophobic clustering: Hydrogen bonding:4. Each diagram in Figure 2 below shows one level of organization of a protein. Identify each level and describe it. CA ITA (a) (b) 0 hydrogen co CH₂ bond H-0 (c) -0, 0 lonic bond C-OH H₂C H₂C CH-CH₂ amino acids -hydrophobic interactions disulfide bridge Figure 2 5. Hemoglobin is made up of four polypeptides, but also require a beme groupWhen a protein folds into a quaternary structure the outside amino acids are exposed to the aqueous (water rich) environment. These amino acid R likely have what chemical properties? O The amino acid R groups are polar and hydrophilic The amino acid R groups are non-polar and hydrophobic O The amino acid R groups have hydrocarbon functional groups O The amino acid R groups have unreactive functional groups