4. What would be the most possible interaction between the side chains (R-group) of isoleucine and phenylalanine? A. Ionic bond B. Disulfide bond C. Peptide bond Van der Waal's interaction E. Hydrogen bond D.
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- 1. The interaction formed between atoms A and B is но H2N NH N H2N NH Но NH2 A В A. Ionic bond B. Hydrophobic interaction © Hydrogen bond D. Peptide bond E. Glycosidic bond 2. Which pair of amino acids has the strongest interaction between their R groups? (A) aspartic acid and lysine B. phenylalanine and alanine C. glutamine and arginine D. valine and isoleucine E. two cysteines disulfde 3. At pH6, which of the following amino acid has zero net charge? A. Alanine B. Arginine C.) Cysteine D. Lysine E. Histidine 11. a. Draw the following pentapeptide: lysine-leucine-aspartate-threonine-phenylalanine b. Label the amino and carboxyl terminus of your peptide c. Label each amino acid residue with one and three letter abbreviations d. Label the alpha carbons e. Label the bonds around which phi and psi rotational angles occur f. Which amino acid in this chain is most likely to be phosphorylated? Which amino acid is most likely to be acetylated?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. Write the structure of each of the following peptides at pH 7: a. Alanylphenylalanine b. Threonylcysteine c. Phenylalanyltryrosylleucine d. Glycylvalylserine 5. Tripeptides are composed of three amino acids linked by peptide bonds. Given a set of amino acids, you can make several different tripeptides. a. Use the three-letter shorthand notations to name all the tripeptides that can be made from serine, tyrosine, and glycine. Each amino acid will be used once in each tripeptide. b. Draw the complete structure of the tripeptides that have glycine as the N-terminal amino acid.Which of the following is not true about the properties of a peptide (amide) bond? a.The bond order of the peptide bond is 2 b.The bond is in resonance which makes it (and the 6 atoms around it and included within it) planar c.Delocalization of electrons through the peptide bond contributes to a net dipole for the bond d.Peptide bonds are very, very strongly favored to be in the trans conformation, but proline is an exception because it is more isoenergetic due to its sidechain ring, and can be cis.2. Two amino acids are shown below. Name them in the blanks, and then draw the structure of the dipeptide they would form if a peptide bond connected them (in the order shown.) Draw the dipeptide as a Zwitterion, and name it in the blank. H3N-CH- CH-C-O CH3 + + H3N-CH₂-C O
- 5.) The side chain (R group) of tyrosine can hydrogen bond to water in two different ways. Use the image of the tyrosine R group below and draw these potential hydrogen bonds with water.3. For each of the following interactions, tell me two amino acids that can form that interaction (between their R groups) at a pH = 7 and sketch the interaction. i. ii. H-bond Charge-charge interactionWhich of the following compounds is most similar to the transition state of peptide bond hydrolysis? A. R2 D. R2- H HO .R1 N میں ملی B. R2 مل ما -R1 E. OH R2 C -R1
- 1.What reactive groups are involved in the formation of a peptide bond?2.A molecule of what substance must be removed in order to form a peptide bond?3. Consider the following amino acid: HS. OH NH2 a. Draw this structure in a solution of potassium hydroxide. b. Draw this structure in a solution of hydrochloric acid c. Draw this structure as a zwitterion. d. If the pKa of the carboxylic acid group is 2.46 and the pka of the amine group is 9.41, calculate the isoelectric point of this amino acid.2. The following bonds help to hold together protein tertiary structure. Which order below reflects their relative strength (with the weakest on the left and the strongest on the right) A. Hydrogen bond - ionic bond - covalent bond - hydrophobic interactions. B. Hydrophobic interactions - hydrogen bond - disulfide bridge - ionic bond. C. Ionic bond- disulfide bridge - hydrophobic interaction - hydrogen bond. D. Ionic bond – hydrophobic interactions - hydrogen bonc disulfide bridge.