26. When we describe regular folding patterns seen backbone we are describing it

Question

26. When we describe regular folding patterns seen backbone we are describing its structure. A) primary B) secondary C) tertiary D) quaternary 27. When we specify the manner in which the four polypeptide together, we are describing its-- .--structure. in localized regions of the polypeptide chains of hemoglobin fit A) primary B) secondary C) tertiary D) quaternary 28. Which of the following is NOT a characteristic of a globular protein? E) monomer A) They have closely packed interior cores B) They have mostly non-polar interiors C) They have mostly polar exterior surfaces D) They sometimes contain disulfide bonds or bind metal ions E) They are not very soluble in water 29. Which of the following is MOST responsible for stabilizing tertiary structure of globular proteins? A) dispersion forces B) dipole-dipole interactions C) hydrogen bonds D) the hydrophobic effect 30 which of the following statements correctly describes the orientation of strands in the . sheet structure shown below? A) strands A and B are parallel, strands B and C are antiparallel B) strands A and B are antiparallel, strands B and C are antiparallel C) strands A and B are antiparallel, strands B and C are parallel D) strands A and B are parallel, strands B and C are parallel E) the orientation of strands cannot be determined from this picture Strand A Strand B Strand C 31. Which of the following processes is least likely to occur when a protein is denatured? A) breaking of peptide bonds B) breaking of hydrogen bonds C) breaking of dipole-dipole interactions D) breaking of interactions between charged amino acid side chains E) disruption of the hydrophobic effect Page 5 of I4

Explanation / Answer

26. B

Secondary structure like alpha-helix and beta-sheets are regular folding pattern in localized regions of the polypeptide backbone which are formed due to the interactions between backbone hydrogen bonding between amides (amino hydrogen and carboxyl oxygen atoms).

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