Structure and Properties of Amino Acids problems
- 1. 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
Correct Answer: Isoleucine, valine and phenylalanine
- 2. 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
Correct Answer: the body cannot synthesize
- 3. What is the product of the catabolic breakdown of Alanine?
Options- A. Fumarate
- B. Oxaloacetate
- C. Pyruvate
- D. Malate Discuss
Correct Answer: Pyruvate
- 4. What is the product of the catabolic breakdown of Arginine?
Options- A. Alpha-ketoglutarate
- B. Fumarate
- C. Oxaloacetate
- D. Succinate Discuss
Correct Answer: Alpha-ketoglutarate
- 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
Correct Answer: Trp & Tyrosine
- 6. Which of the following amino acid contain an imidazolium moiety?
Options- A. Alanine
- B. Valine
- C. Cysteine
- D. Histidine Discuss
Correct Answer: Histidine
- 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
Correct Answer: 110 daltons
- 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
Correct Answer: Asp, Ile, and Pro
- 9. How many different amino acids are there?
Options- A. 3
- B. 20
- C. 100
- D. An infinite number Discuss
Correct Answer: 20
- 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
Correct Answer: hydrophobic, highly reactive and capable of reacting with another cysteine
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