34. Dolichol phosphate a. assists chaperons in protein folding b. recognizes the ER targeting sequence c. adds phosphates to unfolded proteins in the ER d. is a lipid carrier for a oligosaccharides in the ER. e. is a lipid carrier for a oligosaccharides in the Golgi.
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34. Dolichol phosphate
a. assists chaperons in protein folding
b. recognizes the ER targeting sequence
c. adds phosphates to unfolded proteins in the ER
d. is a lipid carrier for a oligosaccharides in the ER.
e. is a lipid carrier for a oligosaccharides in the Golgi.
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Solved in 3 steps
- The idea that primary sequence determines tertiary structure first came from experiments in the 1950's about: A. the renaturation of RNaseA (ribonuclease A). B. the denaturation of lysozyme. C. the 3D structure of lysozyme. D. the role of Hsp70 in protein folding. E. the role of PDI (protein disulfide isomerase) in protein folding.Rationalize the following observations.(a) Serine is the amino acid residue that can be replaced with theleast effect on protein structure and function.(b) Replacement of tryptophan causes the greatest effect on protein structure and function.(c) Replacements such as Lys -> Arg and Leu -> Ile usually havevery little effect on protein structure and function.What signal does the chaperone-mediated autophagy pathway of protein degradation use to identify proteins for destruction? a)The amino acid sequence KFERQ b)HSP90 c)The presence of ubiquitin groups d)The amino acid sequence PEST
- 7. Which of the following events does NOT take place in/on the RER? a. cleavage of the signal recognition peptide b. biosynthesis of core oligosaccharides for N-linked glycosylation c. Phosphorylation of mannose to give rise to mannose-6-phosphate. d. attachment of a core oligosaccharide to protein via asparagine residues e. cleavage of GTP by SRP receptor(61) A 61-year old woman comes to the physician because of scarring acne vulgaris that has not been responsive to topical medication. Oral tetracycline is prescribed . Which of the following best explains the mechanism of action of this drug? (A) Blockage of DNA gyrase (B) Destruction of active transport membrane transport (C) Inhibition of aminoacyl-RNA binding to bacterial ribosomes (D) Interference with the action of peptidyl transferase (E) Interferance with translocation reactionWhat is a hydropathy plot, and why is it used?A.A hydropathy plot, is a graph showing the distribution of hydrophobic amino acids along the length of a peptide sequence and is used to predict the regions within a protein most likely to be post-translationally modified with a lipid moiety. B.A hydropathy plot identifies the concentration of water in a cell and is used to predict the type of metabolic reactions performed by the cells. C.A hydropathy plot , is a graph showing the distribution of hydrophillic amino acids along the length of a peptide sequence and is used to predict the regions within a protein most likely to be glycosylated. D.A hydropathy plot, is a graph showing the distribution of hydrophobic amino acids over the length of a paptide sequence, which is used to predict the position of transmembrane domains within a protein.
- 46. The SH2 protein domain has 2 binding sites: one for ________ and one for _________. A. Phosphotyrosine; {a}- methyltyrosine B. C- Terminus; N-terminus C. Phosphotyrosine; flanking amino acids D. Alpha Helices; Beta-Pleated SheetsWhich of the following statements regarding Anfinsen's denaturing experiments with ribonuclease A are valid? (i) Exposing the denatured protein to air oxidation and then dialysis to remove urea restored the protein to its original functionality. (ii) Removing urea by dialysis and then allowing air oxidation of the denatured protein restored the protein to its original functionality. (iii) Denaturing the protein with both urea and β-mercaptoethanol yielded an inactive protein. (iv) Protein folding is determined by its primary sequence.In the deoxy state of HB, which of the following does not occur? a) An inter-chain salt bridge between Histidine 146 and Lys 40 b) An intra-chain salt bridge between Val 98 and Tyr 145. c) An intra-chain salt bridge between Histidine 146 and Aspartate 94 side chains d) A peptide bond between Tyr 145 and His 146.
- 2. A mixture of the following amino acids (glu, leu, val, arg, ser, phe) was obtained upon complete hydrolysis of a hexapeptide. a. Edman’s reagent releases leucine b. Hexapeptide with carboxypeptidase releases serine. c. Hexapeptide with trypsin forms a tripeptide A with leucine at the N terminal and tripeptide B with valine at the N terminal. d. Tripeptide A with carboxypeptidase releases arginine and a dipeptide with glutamic acid at C terminal. e. Tripeptide B with chymotrypsin form releases serine and another dipeptide. Give: 1. the amino acid sequence of tripeptide A and B. 2. the amino acid sequence in the above hexapeptide.62) If you want to inhibit protein synthesis on the transcriptional level you would use: a) Tetracyclin b) Vancomycin c) Macrolides d) Fluroquinolones e) a & c 63) The protein that prevents the formation of off-centered septation in bacteria is: a) FtsZ b) MreB c) MinCD d) Tubulin e) Septin 64) The autoclave pressure must reach at least ________ in order to effectively kill the bacterial spores: a)15 psi b) 15 Joules c) 15 Kilograms d) 15 Lbs e) 15 Kilocalories 65) Incineration is a type of ______ method in controlling bacterial growth: a) moist heat b) dry heat c) chemical d) chemotherapeutic e) genetic.mutate all of your D-form amino acids in your peptidoglycan peptide side chains to L forms. What have just done to your peptidoglycan? • A. You prevent lysozyme from being able to work • B. You prevent NAM and NAG from linking together C. You have made it susceptible to degradation by proteases • D. You prevent it from being flipped from the cytoplasm across the plasma membrane O E. Nothing, there is no difference between the L and D forms of amino acids