CBSE  /  Class 12  /  Chemistry  /  Biomolecules

  • 1. 
    Mark the wrong statement about denaturation of proteins

  • The primary structure of the protein does not change
  • Globular proteins are converted into fibrous proteins
  • Fibrous proteins are converted into globular proteins
  • The biological activity of the protein is destroyed

  • 2. 
    In fibrous proteins, polypeptide chains are held together

  • van der waals forces
  • electrostatic forces of attraction
  • hydrogen bonds
  • covalent bonds

  • 3. 
    Which type of interactions are responsible for making the a-helix structure stable?

  • Peptide bonds between -NH
  • Hydrogen bonds between -NH of amino acid in the one turn with -CO of amino acid to adjacent turn
  • -OH group of one amino acid with -CO group of other amino acid on the turn
  • Hydrogen bonds between adjacent amino acids

  • 4. 
    Which of the following is an acidic amino acid?

  • Glycine
  • Valine
  • Leucine
  • Glutamic acid

  • 5. 
    The melting points of amino acids are higher than the corresponding hal-acids because

  • amino acids exist as zwitter ions resulting in strong dipole-dipole attraction
  • amino acids are optically active
  • due to higher molecular mass of-NH
  • they interact with water more than halo-acids and have salt like structure

  • 6. 
    Most common types of secondary structures of proteins are

  • a-helix and P-helix structures
  • a-helix and P-pleated sheet structures
  • right and left hand twisted structures
  • globular and fibrous structures

  • 7. 
    Mark the incorrect example

  • Keratin and myosin-fibrous proteins
  • Insulin and albumines-Globular proteins
  • Glycylalanine-Djpeptide
  • Enzymes and haemoglobin-Derived proteins
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