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- 24. The sidechain of the amino acid serine is -CH2-OH. Serine is classified as this type of amino acid (side chain): a) hydrophobic and nonpolar b) hydrophilic and polar c) acidic d) basic7. Draw and give the full names of the amino acids in the following dipeptides. ČHS HN- OH CH, CH- OH CH21. Isoelectric point of polypeptide: (1) is pH at which the o-carboxyl and o-amino groups are uncharged. (2) is pH at which the net charge on the molecules in solution is 0. (3) is pH at which the charge of the o-carboxyl group is higher than the charge of the o- amino group. А. (1) only В. (2) only С. (3) only D. (1) and (3) E. (2) and(3)
- 6. b. Draw a box around the disulfide bridge in oxytocin, if present, or write "none". 7. Mark each peptide bond in oxytocin by making the corresponding line in the structure thicker or marking it with a different color. The first one is shown for you as an example (in dark orange). 8. Number the central carbon of each amino acid in oxytocin by pointing a small arrow to it or by circling the corresponding vertex in the image. Numbers 1 and 2 indicate the central carbons of the first and second amino acids of oxytocin, and are shown for you as an example. 9. Fill out the following table, listing amino acids that make up oxytocin in order, from the N terminus to the C terminus, characterizing each amino acid by the properties of its R group (side chains), and briefly indicating the reasoning for the characterization. You may consult amino acid groupings by category in the slides (or the textbook, p.49), but you must explain the reasoning for each in your own words. CO 1 AA# Abbre- Full…4. What type of tertiary structure interactions are most likely between the following amino acids? (Use a reference chart as necessary.) (b) methionine and methionine (a) glycine and valine (d) serine and lysine (c) cysteine and cysteine1. Which best describes the contribution of primary (1’) structure of polypeptides to the native conformation of proteins: a) Structure that results from intrachain interactions of amino acid side chains b) Structure that results from interchain interactions of amino acid side chains c) Structure that results from base pairing d) Structure that results from the linear sequence of amino acids from beginning to end of molecule.
- 5. Classify each of the following amino acids as polar or nonpolar and hydrophilic and hydrophobic. NH2 CH2 CH2 H2N-C-COOH H2N-C-COOH H. a. b. Polar or nonpolar: Hydrophilic or Hydrophobic:6. Structure and biological role of phosphatidic acid.18. Which of the following characteristics are found in the class of C20 carboxylic acids called prostaglandins? a) A five membered ring b) One or more double bonds c) Several oxygen containing groups d) Two of the above e) All of these choices
- 3. Which best describes the contribution of tertiary (3’) structure of to the native conformation of polypeptides and proteins: a) Structure that results from intrachain interactions of amino acid side chains b) Structure that results from interchain interactions of amino acid side chains c) Structure that results from base pairing d) Structure that results from the linear sequence of amino acids from beginning to end of molecule2. a) State the three components of nucleic acid. b) List the four nitrogenous bases in nucleic acid.1. Define proteins 2. Discuss the different properties of proteins 3. Discuss the classification proteins based on the structure of protein 4. Discuss the classification proteins based on composition 5. Discuss the classification proteins based on functions 6. Discuss the solubility of protein in water 7. Discuss the denaturation and renaturation 8. Discuss the protein metabolism 9. Discuss the chemical properties of protein 10. Define amino acids 11. Discuss the non-essential and essential amino acids