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Biochemistry
9th Edition
ISBN: 9781319114671
Author: Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher: W. H. Freeman
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How do the resonance structures of the peptide group contribute to the planar arrangement of this group of atoms?
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- a peptide has the sequence: Asp-His-Tyr-Cys. What is the net charge on this molecule at pH 7.0? Will it have the same net charge at pH 12?arrow_forwardWhich of the following statements are False? (i) Parallel b-sheets characteristically distribute hydrophobic side chains on both sides of the sheet, and antiparallel B-sheets are usually arranged with all their hydrophobic residues on one side of the sheet. (ii) Planarity of the peptide bond means that no rotation occurs about the N-Ca bond while rotation is allowed about the C(O)-N and Ca-C(O) bonds. (iii) Silk fibers consist of fibroin proteins consisting of alternating A and G or S residues. (iv) If an aspartic acid residue were present in the interior of a globular protein, it would most likely be deprotonated and thus negatively charged.arrow_forwardWithin a naturally-occurring polypeptide, under neutral pH conditions (pH = 7.0), which of the following amino acids always has a negatively charged carboxyl group? the first amino acid in the primary structure histidine lysine arginine the last amino acid in the primary structurearrow_forward
- The bottom peptide segment is found in the secondary structure composed of anti-parallel - sheets. From the C-terminus of the peptide below, the sequence immediately after alternation contains the following amino acid residues (from N → C) A-F-R-M-Y-A. a) which side do you expect to face the solvent? Briefly explain your reasons NH, но Nterminusarrow_forwardWhat is the net charge on the peptide RHTLE at pH 12.5?arrow_forwardList the attractive interactions involved in secondary, tertiary, and quaternary protein structure.arrow_forward
- (c) The i-motif structure requires a pH of between 4.2 and 5.2. (i) Explain, using chemical structures, why this is the case.arrow_forwardConsider a short peptide with the sequence M-C-Q-L-Y-P-E-D-K. List the ionizable groups in this peptide, and the net charge of the whole peptide at pH a) 1.5, b) 7.0, and c)12.0.arrow_forwardDoes amino acid sequence or amino acid composition have more of an impacts the protien structure?arrow_forward
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