The amino acids glutamine and glutamic acid are shown in the figure. They differ only in the structure of part of their side chains (circled). At pH7, what type of interactions are possible for glutamic acid but not for glutamine? glutamine (Gln, or Q) H -N-C-C- H CH$_2$ CH$_2$ glutamic acid (Glu, or E) H O -N-C-C- H CH$_2$ CH$_2$ C C NH$_2$ O$^-$
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Step 1: Glutamic acid has a carboxyl group (-COOH) in its side chain, which can ionize at pH 7 to form a carboxylate group (-COO$^-$). Show more…
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The amino acid Glutamine has a region of its R-group that has a double-bonded O with a partial negative charge. What amino acid will Glutamine most likely interact with to promote protein folding through a hydrogen bond? Glutamine (Gln / Q) An amino acid with an extra electron on its R-group An amino acid with an amino group in its R-group which produces a partial positive charge on the hydrogens bound to the nitrogen Another Glutamine A non-polar amino acid with a long chain of C's and H's It is unlikely to form a hydrogen bond with any other amino acid
Madhur L.
The amino acid Glutamine has a region of its R-group that is double-bonded to oxygen (O) with a partial negative charge. What best explains the existence of this partial charge? Glutamine (Gln) The positive charge of the amino group has to come from somewhere: It has a significantly higher electronegativity than the C that it is bound to. The electrons that the C and O share spend more time around the O atom; It picked up an extra electron from another amino acid's R-group:
An amino acid that has an amide group in its side chain is: a. Glutamine b. Lysine c. Serine d. Cysteine e. Histidine The pKa for the amino group of glycine is 9.8. Of 100 molecules of glycine at pH 9.8, how many have ionized amino groups? The primary structure of a protein describes the ____________________. a. number of each type of amino acid (percent composition) b. linear sequence of amino acids c. overall three-dimensional shape d. Φ and ψ angles for each amino acid e. number of branches in the polypeptide chain The peptide bond is which of the following? a. an amide bond b. an ester bond c. an ether bond d. an amine bond e. any carbon-carbon bond in a polypeptide Proteins often have more than one compact, globular, structural unit. These units are called ____________________. What is true about the rotation about bonds in a protein backbone? a. The rotation is free about all bonds in the backbone, except for the bond between the nitrogen and the alpha carbon in proline residues. b. The bond between the carbonyl carbon and nitrogen is restricted. Other bonds are free to rotate depending only on steric hindrance or the presence of proline residues. c. All bonds in the backbone have restricted rotation and partial double-bond character. d. The rotation is free only about the peptide bond. The other bonds are restricted by steric hindrance and the presence of proline residues. Which is true about the side chains of residues in an α-helix? a. They extend above or below the pleats. b. They extend radially outward from the helix axis. c. They point toward the center of the helix. d. They hydrogen bond extensively with each other. e. They are limited to only hydrophobic side chains.
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