Biopharmaceuticals MCQ

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• What bonds stabilize the extracellular structure of proteins?
  ক

  Hydrogen bond

  খ

  Disulfide bonds

  গ

  Hydrogen bonds

  ঘ

  Ionic bonds
• Which of the following is a characteristic of a quaternary protein structure?
  ক

  Formed by any single peptide chain in a whole protein molecule

  খ

  Arrangement of polypeptide chains

  গ

  Arrangement of different folding of the structure

  ঘ

  Arrangement of the water molecules on the surface
• Intracellular protein tertiary structures mostly held together by ___________
  ক

  Covalent forces

  খ

  Disulfide bridges

  গ

  Weak forces

  ঘ

  Ionic bonds
• Which of the following will be a characteristic of homotypic quaternary structure?
  ক

  Formed by any single peptide chain in a whole protein molecule

  খ

  Arrangement of polypeptide chains

  গ

  Association between identical polypeptides

  ঘ

  Association between subunits of different structure
• B-Sheet is the most stable.
  ক

  True

  খ

  False
• Adjacent polypeptide segments are stacked one above other.
  ক

  True

  খ

  False
• Alpha-helix and b-sheet, if occur together, are found in different structural layers.
  ক

  True

  খ

  False
• What is the name of the bond formed when electrons are shared unequally?
  ক

  Polar covalent bond

  খ

  Nonpolar covalent bond

  গ

  Hydrophobic interaction

  ঘ

  Metallic bond
• What is the name of the bond formed when electrons are shared equally?
  ক

  Disulfide bond

  খ

  Nonpolar covalent bond

  গ

  Hydrophobic interaction

  ঘ

  Metallic bond
• What is the name of the bond found in metals; holds metal atoms together very strongly?
  ক

  Disulfide bond

  খ

  Ionic bond

  গ

  Hydrophobic interaction

  ঘ

  Metallic bond
• What is the name of the bond formed between two ions by the transfer of electrons?
  ক

  Disulfide bond

  খ

  Ionic bond

  গ

  Hydrophobic interaction

  ঘ

  Covalent bond
• What is the name of the bond formed between two ions by the sharing of electrons?
  ক

  Disulfide bond

  খ

  H bond

  গ

  Hydrophobic interaction

  ঘ

  Covalent bond
• Van der Waals forces are the only attractive forces present in nonpolar compounds.
  ক

  True

  খ

  False
• Which of the following is a characteristic of the secondary structure of a protein?
  ক

  Amino acid sequence

  খ

  Association of secondary structure

  গ

  Alpha helix and beta sheets

  ঘ

  Association of polypeptides
• What is the name of the bond which is caused by changes in electron density?
  ক

  Vander Waals force

  খ

  H bond

  গ

  Hydrophobic interaction

  ঘ

  Electrostatic bond
• In secondary structure, the interactions of the R groups give a protein its specific three-dimensional tertiary structure.
  ক

  True

  খ

  False
• Which of the following of a protein molecule determines the strength of van der Waals force?
  ক

  The molecular weight of the protein

  খ

  PI of the protein

  গ

  Number of amino acids present

  ঘ

  The surface area of the molecule
• What is the approximate strength of the interaction between atoms in a covalent bond?
  ক

  500 kJ/mol

  খ

  150 kJ/mol

  গ

  100 kJ/mol

  ঘ

  250 kJ/mol
• What is the name of the links between sulfur atoms of two cysteine amino acids?
  ক

  Disulfide bond

  খ

  H bond

  গ

  Hydrophobic interaction

  ঘ

  Electrostatic bond
• Which of the bonds are between the polar side groups of amino acids?
  ক

  Disulfide bond

  খ

  Hydrogen bond

  গ

  Hydrophobic interaction

  ঘ

  Electrostatic bond
• What is the name of attractions between polar or ionized R groups and water on the surface of the tertiary structure?
  ক

  Disulfide bond

  খ

  H bond

  গ

  Hydrophilic interaction

  ঘ

  Electrostatic bond
• Hydrophobic interactions are attractive interactions, resulting from the inability of water to form hydrogen bonds with certain side chains.
  ক

  True

  খ

  False
• What is the strength of salt bridges?
  ক

  10-15 kcal/mol

  খ

  20-25 kcal/mol

  গ

  17-20 kcal/mol

  ঘ

  4-7 kcal/mol
• Salt bridges are which kind of bonds?
  ক

  Disulfide bond

  খ

  H bond

  গ

  Hydrophobic interaction

  ঘ

  Electrostatic bond
• H bond doesn’t allow structural change.
  ক

  True

  খ

  False
• Which bond is weak and allow to be broken and reformed easily?
  ক

  Disulfide bond

  খ

  H bond

  গ

  Hydrophobic interaction

  ঘ

  Electrostatic bond
• What is the disulfide bond?
  ক

  The ionic bond between S-S

  খ

  Vander Waals interaction between two S atoms

  গ

  The covalent bond between sulfur atoms on two cysteine amino acids

  ঘ

  The covalent bond between any two sulfur atoms
• Salt Bridges is one of the Interactions stabilizing protein structure.
  ক

  True

  খ

  False
• One of the Main Forces that stabilize covalent structures in proteins is the interaction between the protein and the ____________
  ক

  Other protein

  খ

  Cells around

  গ

  Solvent

  ঘ

  Cell debris around
• Interactions between atoms within the protein chain are one of the main forces that stabilize covalent structures in Proteins.
  ক

  True

  খ

  False