This test covers from chapter 1 through chapter 3 • Total number of questions is 50. • One attempt per question • One question at a Time • No backtracking Question 52 Which is the symbol of glutamic acid? G M T L E Previous
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1. Which of the following is an amino acid not found in proteins?A. asparagineB. ornithineC. isoleucineD. proline2. Which amino acid has the one-letter symbol E?A. AlysineB.phenylalanineC.histidineD.glutamic acid3. Which amino acid has the three-letter symbol asn?A.aspartic acidB.asparagineC.alanineD.arginine4. Which is a correct pair of abbreviations for an amino acid?A.Gin/NB.Tyr/TC.Asn/ND.Phe/PE.Pro/Q5. Which amino acid has a benzene-like ring?A.Glutamic AcidB.HistidineC.IsoleucineD.SerineE.Tyrosine6. Which amino acid is classified as polar?A.LB.HC.PD.I7. Which amino acids contain sulfur?A.cysteine and lysineB.cysteine and methionineC.arginine and methionineD.cysteine and isoleucine8. Which amino acid takes on a positive charge when the R-group gains a proton?A.Glutamic AcidB.HistidineC.GlutamineD.TyrosineE.Glycine
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35) A red protein isolated from erythrocytes would most likely be which of the following? (a) hemoglobin (b) myoglobin (c) Immunoglobulin A (d) collagen (e) alpha amylase 36) Which of the following types of bonds or interactions is involved in holding subunits of an oligomeric protein together? (a) electrostatic interactions (b) hydrophobic interactions (c) disulfide bonds (d) all of the above 37) Hemoglobin contains a significant proportion of alpha helix structure. (a) true (b) false 38) At its isoelectric point, an immunoglobulin G molecule has: (a) No net charge (b) An overall negative charge (c) An overall positive charge (d) all of the above 39) Which of the following amino acids in a protein contains a side chain that may be covalently modified with a phosphate group? (a) lysine (b) alanine (c) tryptophan (d) tyrosine 40) In the formation of a peptide bond, which of the following is lost? (a) CO2 (b) CH3 (c) H2O (d) H2O2 41) Two different proteins can have the same amino acid composition. (a) true (b) false 42) Proteins have an alpha carboxyl group at their beginning. (a) true (b) false 43) Two different proteins can have the same amino acid sequence. (a) true (b) false 44) Which of the following is not an amino acid that is found in proteins? (a) glutamic acid (b) aspartic acid (c) glutamine (d) palmitic acid (e) leucine 45) Immunoglobulin G does not have quaternary structure. (a) true (b) false 46) Immunoglobulin G is composed of identical subunits. (a) true (b) false 47) The variable domain of IgA is found at: (a) the N-terminus (b) the C terminus (c) the hinge region (d) the Fab domain (e) none of the above 48) Five proteins, all the same molecular weight but having different pI values, are separated by electrophoresis at pH 9. Which of the proteins below will migrate furthest toward the positive electrode, the one with? (a) pI = 10.0 (b) pI = 7.0 (c) pI = 11 (d) pI = 9 (e) pI = 8 49) Which of the following amino acids in a protein contains a side chain that may be covalently modified with a phosphate group or alternatively with carbohydrate? (a) lysine (b) alanine (c) tryptophan (d) threonine
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