Bio1332 Biochemistry - Lecture Two - Amino Acids And Proteins

13 Questions

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Bio1332 Biochemistry - Lecture Two - Amino Acids And Proteins

• Know what an amino acid is. • Appreciate the properties of key amino acids. • Understand what secondary structure is.


Questions and Answers
  • 1. 
    Fill in the gaps below:Proteins contribute to the cell in many ways.They work as #_____# to catalyse reactions.They can also work by interacting with RNA and DNA to control nucleic acids, e.g. #_________# factors.Lipid-bound proteins work as #_______# systems.
  • 2. 
    Complete the following sentence:The monomeric unit of a protein is an _______________.
  • 3. 
    In an amino acid, what is the centre alpha-carbon bound to?
    • A. 

      Amino group, carboxyl group, hydrogen atom, R group

    • B. 

      Amino group, carboxyl group, hydrogen atom, A group

    • C. 

      Amino group, hydroxyl group, hydrogen atom, R group

    • D. 

      Amino group, hydroxyl group, hydrogen atom, A group

  • 4. 
    Which group in the amino acid varies, giving each amino acid individuality?
    • A. 

      R group

    • B. 

      Amino group

    • C. 

      Carboxyl group

    • D. 

      Hydrogen atom

  • 5. 
    True or False?If a molecule is 'chiral', it means it is identical to / indistinguishable from its mirror form.
    • A. 

      True

    • B. 

      False

  • 6. 
    Is the alpha carbon atom chiral?
    • A. 

      Yes

    • B. 

      No

  • 7. 
    Name the amino acid that does not have a mirror image.
  • 8. 
    In which form are amino acids found?
    • A. 

      Laevus

    • B. 

      Dexter

    • C. 

      Option 3

    • D. 

      Option 4

  • 9. 
    Complete the following sentence:Amino acids are _________, meaning they're a neutral molecule containing both a positive and a negative charge.
  • 10. 
    How is a polypeptide chain formed?
    • A. 

      From N-terminal to C-terminal

    • B. 

      From C-terminal to N-terminal

    • C. 

      From 5'-3'

    • D. 

      From 3'-5'

  • 11. 
    How are the R groups arranged in an alpha-helix secondary structure?
    • A. 

      They all point outwards

    • B. 

      They all point inwards

    • C. 

      They follow the shape of the helix