Which of the following is not known to be involved in the process of assisted folding of proteins? OA) Chaperonins OB) Disulfide interchange OC) Heat shock proteins OD) Peptide bond hydrolysis OE) Peptide bond isomerization
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- What is the CORRECT way to classify the protein below according to its secondary- structure elements? un a) not possible to determine b) all a ○ c) alẞ Od) a + B e) all B7) The figure below shows a B-barrel protein embedded in a hydrophobic membrane. The central cavity of the B-barrel protein is open to aqueous solvent. Which of the following sequences belongs to one of B-strands that forms part of the B-barrel protein? A) LVMIAVL B) ETSDGHR C) LVIMDRE hydrophobic membrane D) VQLTAKL hydrophobic membrane water-filled cavity7) The figure below shows a 3-barrel protein embedded in a hydrophobic membrane. The central cavity of the B-barrel protein is open to aqueous solvent. Which of the following sequences belongs to one of B-strands that forms part of the B-barrel protein? A) LVMIAVL B) ETSDGHR C) LVIMDRE hydrophobic membrane D) VQLTAKL A hydrophoble membrane water-filled cavity
- Which of the following statements about electron microscopy are true? a) Most existing protein structures have been resolved using electron microscopy b) Electron microscopy is not used in structural biology as it can not give as high a resolution as X-ray crystallography and NMR c) The smaller a protein, the easier it is to solve its structure with electron microscopy d) By taking pictures of the same protein frozen in ice thousands of times and then adding them together, you get a high-resolution image of the protein e) The first protein structure with true atomic resolution was solved using electron microscopy last yearConsider the synthesis of a polypeptide by a ribosome of a prokaryote cell. As the polymerization of amino acids to form a polypeptide chain occurs and the molecule is still completely linear, what is the level of structure in the protein? a) primary, b) secondary, c) tertiary, d) quaternary, e) Because they are ionic, they only form crystals.sugar and phosphate in a polynucleotide backbone are covalently linked by what? a) N-glucosidic bond b) phosphodiester bond c) peptide bond d) beta strand e) alpha helix
- Consider the synthesis of a polypeptide by a prokaryote ribosome. When the polymerization of amino acids to form a polypeptide chain occurs and the molecule is still completely linear, what is the level of structure in the protein? A) primary B) secondary C) tertiary D) quaternaryFor the three peptides below, label whether they would form an amphiphilic beta-strand, amphiphilic helix, or nothing. Explain why. Part a) S-V-K-I-Q-M-R-A-D-L Part b) A-L-E-H-M-F-R-Y-L-A-K Part c) A-L-A-I-W-F-P-D-R-K-EWhat protecting groups in solid-phase peptide synthesis NOT do? a)Activate the carboxlic acid to have a good leaving group b)Prevent the amino acid backbones from randomly polymerizing in solution c)Prevent the amino acid side chains from undergoing uncontrolled chemistry d)Get cleaved from the peptide when the peptide is cleaved from the resin
- Protein structure and function: a) Name two common post-translational modifications of proteins in the cell that will affect their structure/function. b) What are prions? Briefly describe their structure and function. C) Explain the principles of protein folding and significance of urea and Bmercaptoethanol in the experimental procedures addressing this question.A protein which has more than one stable conformation is called a: a) chaperone protein b) molten globule c) flexible protein d) inherently unstructured protein If a denatured protein does not spontaneously renature upon removal of denaturing agents, it may require a ____ to renature. a) chaperone protein b) molten globule c) flexible protein d) inherently unstructured protein Prion protein and amyloid protein have which trait in common? A) They denature very easily b) they are both unstable forms of ribonuclease c) they bind strongly to hemoglobin d) they both may assume a fibrous form which is damaging to brain tissueAlthough all of these may play a part, the major driving force in protein folding is: a) hydrogen bond formation b) salt bridge formation c) steric interactions d) the hydrophobic effect A partially folded protein is called a a) peptide template b) active domain c) molten globule d) precursor protein Which of these processed is NOT seen in protein denaturation? A) subunits are dissociated b) folding is unraveled c) alpha helix and beta sheets are unraveled d) peptide bonds are broken. A protein which has more than one stable conformation is called a: a) chaperone protein b) molten globule c) flexible protein d) inherently unstructured protein If a denatured protein does not spontaneously renature upon removal of denaturing agents, it may require a ____ to renature. a) chaperone protein b) molten globule c) flexible protein d) inherently unstructured protein Prion protein and amyloid protein have which trait in common? A) They denature very easily…