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11 Nov 2019
Which of the following statements about alpha-helices and beta-sheets is/are FALSE? A. Both are stabilized by hydrogen bonds between groups in the polypeptide backbone. B. Both have conformations that require specific angles of rotation around the peptide bond. C. Both alpha-helices and beta-sheets form only from adjacent (sequential) amino acid residues in the polypeptide. D. A and B E. B and C Which of the following amino acid residues form hydrogen bonds with Ala residues located in an alpha - helix? A. Residues in a neighbouring alpha-helix. B. Residues located within the same alpha-helix. C. None, because Ala is unable to form hydrogen bonds. Which of the following statements about quaternary structure is TRUE? A. Quaternary structure is defined as the arrangement of polypeptide backbones in proteins with four subunits. B. Quaternary structure exists only in monomeric proteins containing more than one domain. C. Quaternary structure is stabilized by the same types of noncovalent interactions as tertiary structure. D. Quaternary structure requires covalent interactions between polypeptide chains. Where do a helices fall on a Ramachandran plot?
Which of the following statements about alpha-helices and beta-sheets is/are FALSE? A. Both are stabilized by hydrogen bonds between groups in the polypeptide backbone. B. Both have conformations that require specific angles of rotation around the peptide bond. C. Both alpha-helices and beta-sheets form only from adjacent (sequential) amino acid residues in the polypeptide. D. A and B E. B and C Which of the following amino acid residues form hydrogen bonds with Ala residues located in an alpha - helix? A. Residues in a neighbouring alpha-helix. B. Residues located within the same alpha-helix. C. None, because Ala is unable to form hydrogen bonds. Which of the following statements about quaternary structure is TRUE? A. Quaternary structure is defined as the arrangement of polypeptide backbones in proteins with four subunits. B. Quaternary structure exists only in monomeric proteins containing more than one domain. C. Quaternary structure is stabilized by the same types of noncovalent interactions as tertiary structure. D. Quaternary structure requires covalent interactions between polypeptide chains. Where do a helices fall on a Ramachandran plot?
Keith LeannonLv2
11 Aug 2019