Which of the following is true about a peptide bond: Electron delocalization occurs between the a-amino group of one residue and the a-carbon of the subsequent residue The peptide bond is freely rotatable along its bond axis The peptide bond contains 5 co-planar atoms Dehydration to link two residues occurs due to thermodynamic coupling to high-energy phosphate hydrolysis None of the answers are correct
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- Given the following decapeptide sequence, which aminoacids would you expect to be on the surface of this moleculeonce it folds into its native conformation?Gly—Phe—Tyr—Asn—Tyr—Met—Ser—His—Val—LeuWhich of the following amino acids can interact via ionic/electrostatic interactions with lysine at physiologic pH 7.4?a. Histidineb. Asparaginec. Glutamatewhich of the following statements is correct regarding the affect of pH on the ionization of R groups in amino acids. Put yes or no next to each number. 1) at an acidic pH, amino groups in an R group tend to lonize by accepting a proton and have a positive charge2) at an acidic pH, carboxyl groups in an R group are likely to be in an unionized state.3) at an alkaline pH, amino groups in an R group have a tendency to remain unionized (and uncharged).4) at an alkaline pH, carboxyl groups in an R group have a tendency to lonize by loosing a hydrogen ion (H+)5) R groups that do not have an amino or carboxyl group do not ionize at pH of the environment changes.
- Which of the following pairs of amino acids can have intermolecular hydrogen bonding between the functional groups in their side chains? Select all that apply. phenylalanine and tyrosine two tyrosine residues serine and threonine alanine and threonineGiven a peptide chain that is composed of the following amino acids:(branched chain-- polar uncharged--polar positively charged -- polar negatively charged-- aromatic) 10If the component amino acids of the above peptide chain are subjected to paper chromatography, which of the amino acids will be farthest from the point of origin?Which way is more common practice to characterize the strength of a binding reaction between a protein and its ligand? Group of answer choices By its binding free energy, delta G By its equilibrium association constant K(A) By its equilibrium dissociation constant K(D) By the rate at which the biding reaction proceeds
- Disulfide bridges can form in proteins that are in an oxidizing environment. They form between what amino acid residues? a.) Between cysteine residues that are close in three-dimensional space, but not necessarily close in the primary structure b.) Always between cysteine residues between protein subunits c.) Between cysteine residues that are adjacent in the the primary structure d.)They will occur between any two cysteine residues in a protein e.) Between a methionine and a cysteine residueThe pKa of an acid depends partly on its environment. Predict the effect of each of the following environmental changes on the pKa of a glutamic acid side chain. (a) A lysine side chain is brought into proximity. (b) The terminal carboxyl group of the protein is brought into proximity. (c) The glutamic acid side chain is shifted from the outside of the protein to a nonpolar site insideWhich of the following amino acids have R groups that have hydrogen- bonding potential? Ala, Gly, Ser, Phe, Glu, Tyr, Ile, and Thr
- Which of the following (could be more than one) would not be a rational explanation for why the three-dimensional structure of a protein is driven and stabilized largely by noncovalent rather than covalent bonds?a) Proteins may be degraded for energy, and if their three-dimensional structures were heldtogether by mostly covalent bonding, this might be too difficult to accomplishb) Proteins will need to be unfolded to cross biological membrane, and if their three-dimensionalstructures were held together by mostly covalent bonding, this might be too difficult toaccomplish.c) Protein function (transport, enzyme catalysis, etc...) may require flexibility in the three-dimensional structure to allow for conformational change, and if protein three-dimensionalstructure were held together by mostly covalent bonding, this might be too difficult toaccomplish.d) All of the answer choices are rational explanations for why the three-dimensional structure of protein is driven and stabilized largely…You have a solution with the mixture of the following peptides: 1) Wing-Cys-Gly 2)phe-tyr-trp-phe 3)glu-asp-glu-ileHow are each of them charged at the following pH?a) 3 b) 5 c) 7 d) 9What amino acid(s) is(are) deemed to be present when a positive reaction is obtained upon heating in a 40% NaOH and 2% lead acetate? cysteine and methionine methionine and cystine cystine and cysteine cysteine, cystine, and methionine