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Home Biochemistry Structure and Properties of Amino Acids Comments

  • Question
  • The sulphur containing side chain of cysteine is


  • Options
  • A. ampiphillic, highly reactive and capable of reacting with another cysteine
  • B. hydrophillc, highly reactive and capable of reacting with another cysteine
  • C. hydrophobic, highly reactive and capable of reacting with another cysteine
  • D. none of the above

  • Correct Answer
  • hydrophobic, highly reactive and capable of reacting with another cysteine 


  • Structure and Properties of Amino Acids problems


    Search Results


    • 1. How many different amino acids are there?

    • Options
    • A. 3
    • B. 20
    • C. 100
    • D. An infinite number
    • Discuss
    • 2. Which of the following is not a sensible grouping of amino acids based on their polarity properties?

    • Options
    • A. Ala, Leu, and Val
    • B. Arg, His, and Lys
    • C. Phe, Trp, and Tyr
    • D. Asp, Ile, and Pro
    • Discuss
    • 3. In a polypeptide average mass of an amino acid residue is

    • Options
    • A. 110 daltons
    • B. 118 daltons
    • C. 80 daltons
    • D. 150 daltons
    • Discuss
    • 4. Which of the following amino acid contain an imidazolium moiety?

    • Options
    • A. Alanine
    • B. Valine
    • C. Cysteine
    • D. Histidine
    • Discuss
    • 5. Which pair of amino acids absorbs the most UV light at 280 nm?

    • Options
    • A. Threonine & Histidine
    • B. Trp & Tyrosine
    • C. Cystein & Asparagine
    • D. Phenylalnine & Proline
    • Discuss
    • 6. Stereo chemical configuration of all a-amino acids derived from proteins is

    • Options
    • A. L
    • B. D
    • C. L and D
    • D. None of these
    • Discuss
    • 7. Serine and threonine are polar amino acids due to

    • Options
    • A. reactive hydroxyl group in the side chain
    • B. reactive alcoholic group in the side chain
    • C. reactive keto group in the side chain
    • D. reactive aldehyde group in the side chain
    • Discuss
    • 8. Proteins and macromolecular structures take on their higher order structures

    • Options
    • A. by self-assembly
    • B. with the help of molecular chaperons
    • C. with the help of precursor sequences that are removed from the final structures
    • D. all of the above
    • Discuss
    • 9. What is the heaviest of the twenty amino acids?

    • Options
    • A. Phenylalanine
    • B. Tryptophan
    • C. Tyrosine
    • D. Histidine
    • Discuss
    • 10. The ?-amino acids have a carboxyl group with a pK around __________ , and an amino group with a pK near __________ .

    • Options
    • A. 1.1, and 12.1
    • B. 6.5, and 8.0
    • C. 3.3, and 10.5
    • D. 2.2, and 9.4
    • Discuss


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