Amino Acid Metabolism(Biochemistry ) Questions and Answers

Question 1.  Histidine is degraded to α-ketoglutarate and is described as a
  1.    gluco amino acid
  2.    glucogenic amino acid
  3.    ketogenic amino acid
  4.    keto-gluco amino acid
Explanation:-
Answer: Option B. -> glucogenic amino acid
Question 2.  Which of the following amino acids is considered as both ketogenic and glucogenic?
  1.    Valine
  2.    Tryptophan
  3.    Lysine
  4.    None of these
Explanation:-
Answer: Option B. -> Tryptophan
Question 3.  Oxidative deamination is the conversion of an amino
  1.    group from an amino acid to a keto acid
  2.    acid to a carboxylic acid plus ammonia
  3.    acid to a keto acid plus ammonia
  4.    group from an amino acid to a carboxylic acid
Explanation:-
Answer: Option C. -> acid to a keto acid plus ammonia
Question 4.  A person with phenylketonuria cannot convert
  1.    phenylalanine to tyrosine
  2.    phenylalanine to isoleucine
  3.    phenol into ketones
  4.    phenylalanine to lysine
Explanation:-
Answer: Option A. -> phenylalanine to tyrosine
Question 5.  A glucogenic amino acid is one which is degraded to
  1.    keto-sugars
  2.    either acetyl CoA or acetoacetyl CoA
  3.    pyruvate or citric acid cycle intermediates
  4.    none of the above
Explanation:-
Answer: Option C. -> pyruvate or citric acid cycle intermediates
Question 6.  Which of the following is the best described glucogenic amino acid?
  1.    Lysine
  2.    Tryptophan
  3.    Valine
  4.    None of these
Explanation:-
Answer: Option C. -> Valine
Question 7.  An example of a transamination process is
  1.    glutamate = hexanoic acid + NH3
  2.    aspartate + hexanoic acid = glutamate + oxaloacetate
  3.    aspartate + α ketoglutarate = glutamate + oxaloacetate
  4.    glutamate = α-ketoglutarate + NH3
Explanation:-
Answer: Option C. -> aspartate + α ketoglutarate = glutamate + oxaloacetate
Question 8.  Transamination is the process where
  1.    carboxyl group is transferred from amino acid
  2.    α-amino group is removed from the amino acid
  3.    polymerisation of amino acid takes place
  4.    none of the above
Explanation:-
Answer: Option B. -> α-amino group is removed from the amino acid
Question 9. . An example of the oxidative deamination is
  1.    glutamate = hexanoic acid + NH3
  2.    aspartate + α-ketoglutarate = glutamate + oxaloacetate
  3.    glutamate = α-ketoglutarate + NH3
  4.    aspartate + hexanoic acid = glutamate + Oxaloacetate
Explanation:-
Answer: Option C. -> glutamate = α-ketoglutarate + NH3
Question 10. . Transaminase enzymes are present in
  1.    liver
  2.    pancreas
  3.    intestine
  4.    none of these
Explanation:-
Answer: Option A. -> liver
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