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Home Biochemistry Structure and Properties of Amino Acids Comments

  • Question
  • 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

  • Correct Answer
  • Trp & Tyrosine 


  • Structure and Properties of Amino Acids problems


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    • 1. What is the product of the catabolic breakdown of Arginine?

    • Options
    • A. Alpha-ketoglutarate
    • B. Fumarate
    • C. Oxaloacetate
    • D. Succinate
    • Discuss
    • 2. What is the product of the catabolic breakdown of Alanine?

    • Options
    • A. Fumarate
    • B. Oxaloacetate
    • C. Pyruvate
    • D. Malate
    • Discuss
    • 3. An essential amino acid is one that

    • Options
    • A. is essentially easy to synthesize
    • B. is essential to flagella motion
    • C. the body cannot synthesize
    • D. the body can synthesize under essential conditions
    • Discuss
    • 4. Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?

    • Options
    • A. Isoleucine, valine and phenylalanine
    • B. Phenylalanine, valine, and aspartate
    • C. Leucine, threonine, and lysine
    • D. Lysine, arginine and histidine
    • Discuss
    • 5. Most of the important functional groups in biological molecules contain

    • Options
    • A. oxygen and/or nitrogen and are acidic
    • B. oxygen and a phosphate
    • C. nitrogen and a phosphate
    • D. oxygen and/or nitrogen and are polar
    • Discuss
    • 6. Which of the following amino acid contain an imidazolium moiety?

    • Options
    • A. Alanine
    • B. Valine
    • C. Cysteine
    • D. Histidine
    • Discuss
    • 7. 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
    • 8. 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
    • 9. How many different amino acids are there?

    • Options
    • A. 3
    • B. 20
    • C. 100
    • D. An infinite number
    • Discuss
    • 10. 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
    • Discuss


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