An amino acid that has an amide group in its side chain is a. Glutamine b. Lysin

Question

An amino acid that has an amide group in its side chain is a. Glutamine b. Lysine c. Serine d. Cysteine e. Histidine The pK,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, ? and ? 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? The rotation is free about all bonds in the backbone, except for the bond between the nitrogen and the alpha carbon in proline residues. 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. All bonds in the backbone have restricted rotation and partial double-bond character The rotation is free only about the peptide bond. The other bonds are restricted by steric hindrance and the presence of proline residues. a. b. c. d. Which is true about the side chains of residues in an ?-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

Explanation / Answer

Answer:

1) An amino acid that has an amide group in its side chain is

2) When thepH is equal to the pKa of the acid, there are equal amounts of protonated and deprotonated acid molecules.

3) The primary structure of a protein describes the

4) The peptide bond is which of the following

5) Proteins often have more than one compact, globular, structural unit. These units are called domains

6) What is true about the rotation about bonds in a protein backbone?

7) Which is true about the side chain of residues in an alpha-helix

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