Choose the structure of phosphatidylcholine from those shown below:R₁R₁R₁R2R₂OHRzNHHHOoONA2NH3OHOHOHBID

There are four classes of biological macromolecules- nucleic acid, proteins, lipids and…

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Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Describe the amino acid illustrated here (Identify the following amino acid (at pH = 7.0): (COO-)–CH(NH3+)–CH2–CH2–CH2–CH2–(NH3+)) (at pH = 7.0). it is a polar, negatively-charged amino acid it is a non-polar, negatively-charged amino acid it is a polar, positively-charged amino acid it is a non-polar, positively-charged amino acid it is a non-polar, uncharged amino acid
An oligopeptide has the following amino acid sequence: NH2-Ala-Glu–Leu–Trp–Tyr-Ser–Gly–Lys–Leu-Ala–Arg-Ala-Phe-Ile-Pro–Gly-COOH a) Estimate the net electric charge of the molecule at pH 8.0 and pH 11.0. b) If the above peptide is passed through a cation exchange chromatographic column (that is, the matrix of the column has negative charges) stabilized at pH 8.0, would you expect it to be retained on the column? c) Indicates the number of fragments, and the sequence of each of them, that would be obtained when treating the peptide in question with: i) trypsin, ii) chymotrypsin.
Some phospholipid species can be phosphorylated beyond the phosphate attached to the #3carbon. Describe the likely structure of such a phospholipid.Would the mass / charge (m/z) ratio of this molecular increase or decrease upon modification?
Draw the structure of the phosphate group in phosphatidylcholine (or give its stoichiometry).
What would be the characteristics of a transition-state analog for the chymotrypsin reaction?
α-Keratin is an intermediate filament with a basic structural unit of two a helices in a coiled coil. Each helix has a seven-residue repeating unit (heptad repeat). A representation of the a helices of a coiled coil dimer is shown. Each letter represents a different amino acid residue. f g d e Review the table of amino acids. a d g f Identify the three true statements about the structure of keratin. ☐ The a helix of the coiled coil is wound less tightly than predicted for an α helix. ☐ Each polypeptide in the dimer has 3.6 residues per turn, and a nonpolar group occurs every 3.5 residues, resulting in a slight winding, or twist, around the other polypeptide, forming a coiled coil. Arg-Ala-His-Glu-His-Thr-Asp is a likely repeat in the a helix of keratin. ☐ Val-Thr-Asp-Ala-Glu-Arg-His is a likely repeat in the a helix of keratin. ☐ The residues at positions b and c are less likely to be polar or charged because they are in contact with the solvent. ☐ Keratin molecules are very strong due…
Disulfide linkages are uncommon in cytoplasmic proteins, whereas they are common in extracellular proteins. Why?
A one-to-one protein (P)-ligand (L) complexation (P + L PL) has a dissociation equilibrium constant (Kd) value of 100 nM at 25°C, and the Kd remains the same at 37°C. 1) What is AS of binding at 25°C? Assume ACp of the binding is 0 over the temperature range. AS = 1.34E2 kJ/(mol*K) (note the unit!!) (sig. fig =3) 2) What is the concentration of the PL complex formed at equilibrium when you mix 0.20 uM (microM) of Protein and 1.0 uM of Ligand together at 37°C? PL at equilibrium = 8.1E-1 uM (note the unit!!) (sig. fig =2)
We know that some reactions involving loss of water are reversible upon the addition of water (Le Chatelier's Principle). If we heat oleandrin in a solution of acidic water, what would remain attached to the steroid skeleton? Select the correct answer. E он он A Oleandrin is a toxic cardiac glycoside found in the poisonous plant, oleander (Nerium oleander L). It has a very long IUPAC name: acetic acid [(35,5R, 10S,13R,14S,16S, 17'R)-14-hydroxy-3-[[(2R,4S,5S,6S)-5-hydroxy-4-methoxy-6-methyl- 2-tetrahydropyranyl]oxy]-10,13-dimethyl-17-(5-oxo-2H-furan-3-y)-1,2,3,4,5,6,7,8,9,11,12,15,16,17- tetradecahydrocyclopenta[a]phenanthren-16-yl) ester F D E D E OH B он B он (a) no reaction он A (b) он он OH он OH он E он он (c) C он но (d)
In the table below, name each functional group in anserine that is ionizable and record an estimated pKa
Glucose-1-phosphate has a ΔG°′ value of −20.9 kJ/mol, whereas that for glucose-6-phosphate is −12.5 kJ/mol. After reviewing the molecular structures of these compounds, explain why there is such a difference in these values.

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Choose the structure of phosphatidylcholine from those shown below ON< R₁ R₁ R2 R₂ X NH3 OH A B I