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MCQs

Total Questions : 173 | Page 15 of 18 pages
Question 141.  The isoelectric point of an amino acid is defined as the pH
  1.    where the molecule carries no electric charge
  2.    where the carboxyl group is uncharged
  3.    where the amino group is uncharged
  4.    of maximum electrolytic mobility
 Discuss Question
Answer: Option A. -> where the molecule carries no electric charge
Question 142.  What is the product of the catabolic breakdown of Arginine?
  1.    Alpha-ketoglutarate
  2.    Fumarate
  3.    Oxaloacetate
  4.    Succinate
 Discuss Question
Answer: Option A. -> Alpha-ketoglutarate
Question 143.  Which amino acids would most likely reside in the membrane-anchoring domain of a membrane embedded protein?
  1.    Isoleucine, valine and phenylalanine
  2.    Phenylalanine, valine, and aspartate
  3.    Leucine, threonine, and lysine
  4.    Lysine, arginine and histidine
 Discuss Question
Answer: Option A. -> Isoleucine, valine and phenylalanine
Question 144.  An essential amino acid is one that
  1.    is essentially easy to synthesize
  2.    is essential to flagella motion
  3.    the body cannot synthesize
  4.    the body can synthesize under essential conditions
 Discuss Question
Answer: Option C. -> the body cannot synthesize
Question 145. . D-Alanine and L-Alanine are technically known as
  1.    anomers
  2.    enantiomers
  3.    epimers
  4.    polymer
 Discuss Question
Answer: Option B. -> enantiomers
Question 146. . In a polypeptide average mass of an amino acid residue is
  1.    110 daltons
  2.    118 daltons
  3.    80 daltons
  4.    150 daltons
 Discuss Question
Answer: Option A. -> 110 daltons
Question 147. . Which pair of amino acids absorbs the most UV light at 280 nm
  1.    Threonine & Histidine
  2.    Trp & Tyrosine
  3.    Cystein & Asparagine
  4.    Phenylalnine & Proline
 Discuss Question
Answer: Option B. -> Trp & Tyrosine
Question 148. . Which of the following is a nonstandard amino acid?
  1.    Cysteine
  2.    Isoleucine
  3.    Hydroxyproline
  4.    Histidine
 Discuss Question
Answer: Option C. -> Hydroxyproline
Question 149. . 
Which of the following pairs of amino acids would carry a negative charge on their side chain at pH 8.0?
  1.    Asparagine & Glutamine
  2.    Leucine & Glycine
  3.    Histidine & Lysine
  4.    Aspartate & Glutamate
 Discuss Question
Answer: Option D. -> Aspartate & Glutamate
Question 150. . Which of the following is an essential amino acid?
  1.    Tryptophan
  2.    Methionine
  3.    Lysine
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these

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