PG NEET Biochemistry Mcqs 10 – Amino Acids

  1. Total number of amino acids encoded by the human genetic code is
    1. 20
    2. 30
    3. 200
    4. 500Ans (1)
  2. All the following are basic amino acids
    1. Histidine
    2. Argine
    3. Lysine
    4. GlycineAns (4)
  3. Amino acid absorbs UV light due to
    1. peptide bond
    2. aromatic ring
    3. disulfide bond
    4. imino groupAns (2)
  4. The flexibility of protein depends upon the
    1. Glycine
    2. lysine
    3. leucine
    4. aspartateAns (1)
  5. All the following are aromatic amino acids except
    1. Phenylalanine
    2. Tyrosine
    3. Tryptophan
    4. ArginineAns (4)
  6. Sakaguchi test involves
    1. amino acid
    2. bile acid
    3. lipids
    4. nucleic acidAns (1)
  7. Tryptophan contains1. indole group
    2. imidazole group
    3. thioalcohol
    4. thioester linkageAns (1)
  8. Which of the following has imino ring
    1. Proline
    2. Tyrosine
    3. Tryptophan
    4. HistidineAns (1)
  9. Pauly test is for
    1. tryptophan
    2. cysteine
    3. histidine
    4. arginineAns (3)
  10. Which of the following is not a property of amino acids at isoelectric ph
    1. maximum precipitability
    2. maximum buffering action
    3. minimum solubility
    4. no mobility in an electric fieldAns (2)
  11. Which among the following amino acid is polar in nature
    1. Aspartic acid
    2. Glycine
    3. Proline
    4. MethionineAns (1)
  12. Transfer of amino acid from one amino acid to an alpha-keto acid is done by which of the following enzymes
    1.transaminases
    2. aminases
    3. transketolases
    4. deaminasesAns (1)
  13. Purely ketogenic acid among the following amino acid is
    1. Tyrosine
    2. Leucine
    3. Phenylalanine
    4. TryptophanAns (2)
  14. Glutathione is composed of
    1. cystine and glycine
    2. glutamic acid cysteine and glycine
    3. glutamic acid glycine
    4. lysine and methionineAns (2)
  15. The amino acid sequence is found by
    1. sanger’s reagent
    2. benedict’s reagent
    3. seliwanoff’s reagent
    4. none of the aboveAns (1)
  16. Replacing alanine by which of the amino acid will increase UV absorbance of proteinat 280 nm wavelength
    1. Leucine
    2. Proline
    3. Arginine
    4. TryptophanAns (4)
  17. Phenol group-containing amino acid is
    1. arginine
    2. phenylalanine
    3. tyrosine
    4. prolineAns (3)
  18. Tetrahydropterin is a coenzyme for
    1. phenylalanine hydroxylase
    2. tyrosine hydroxylase
    3. tryptophan hydroxylase
    4. all the aboveAns (4)
  19. Iso electric ph is
    1. Point at which ph of ion is above 7
    2. Point at which ph of ions is the same
    3. Point at which ph of the ions do not alter
    4. Point at which positive and negative charge fo amino acids are equalAns (4)
  20. All the following are specialized products from tryptophan except
    1. serotonin
    2. melatonin
    3. melanin
    4. nicotinic acidAns (3)
  21. Ethanolamine is synthesized from
    1. serine
    2. tryptophan
    3. lysine
    4. histidineAns (1)
  22. Amino acid which lacks chirality
    1. Glutamate
    2. Aspartate
    3. Glycine
    4. LysineAns (3)
  23. Which is the final transport form of ammonia in the human body
    1. glutamate
    2. alanine
    3. glutamine
    4. aspartateAns (3)
  24. At physiological ph buffering action in blood is caused by
    1. Histidine
    2. Methionine
    3. Arginine
    4. GlycineAns (1)
  25. Which of the following enzyme is involved in oxidative deamination
    1. glutamate synthetase
    2. glutaminase
    3. glutamate dehydrogenase
    4. glutamate aminotransferaseAns (3)
  26. Which special group is present in arginine
    1. Guanidinium
    2. Benzene
    3. Imidazole
    4. IndoleAns (1)
  27. The cofactor needed for the enzyme tyrosine hydroxylase is
    1. tetrahydrobiopterin
    2. dihydrobiopterin
    3. pyridoxal pyrophosphate
    4. biotinAns (1)
  28. Which among the following enzymes do not contain selenocysteine in their active sites
    1. Thioredoxin reductase
    2. Glutathione peroxidise
    3. Methyl transferase
    4. DeiodinaseAns (3)
  29. Rate limiting enzyme in the biosynthesis of catecholamines is
    1. tyrosine hydroxylase
    2. DOPA carboxylase
    3. dopamine β hydroxylase
    4. tyrosinaseAns (1)
  30. Which of the following triplet codons encodes the amino acids selenocysteine
    1. UAG
    2. UGA
    3. UGG
    4. UAAAns (2)
  31. The first catecholamine to be synthesized is
    1. dopamine
    2. epinephrine
    3. norepinephrine
    4. serotoninAns (1)
  32. Which among the following is the precursor amino acid of selenocysteine1. serine
    2. methionine
    3. isoleucine
    4. alanineAns (1)
  33. Which among the following is the most basic amino acid
    1. aspartate
    2. asparagine
    3. arginine
    4. lysineAns (3)
  34. Which among the following is a branched-chain amino acid
    1. valine
    2. isoleucine
    3. leucine
    4. lysineAns (4)
  35. Which of the following is a purely glucogenic amino acid
    1. leucine
    2. tyrosine
    3. tryptophan
    4. alanineAns (4)
  36. Amino acid coded by stop codon is
    1. cysteine
    2. methionine
    3. proline
    4. selenocysteineAns (4)
  37. The following metabolite is a derivative of tryptophan
    1. melatonin
    2. thyroxine
    3. epinephrine
    4. nor epinephrine
    Ans (1)
  38. Which of the body vitamin can be synthesised from trypt0phan
    1. thiamine
    2. niacin
    3. riboflavin
    4. biotin
    Ans (2)
  39. All the following enzyme form a part of glycine cleavage system except
    1. glycine dehydrogenase
    2. amino methyl transferase
    3. dihydrolipoamide dehydrogenase
    4. imidazalone propianate hydrolase
    Ans (4)
  40. Which among the folowing is a end product in the catabolism of glycine
    1. CO2
    2. ammonia
    3. N5 N10 methelene tetrahydrofolate
    4. all are right
    Ans (4)
  41. All fo the following are secial products obtained from glycine except
    1. creatine
    2. carbon atoms of purine
    3. heme
    4. nitric oxide
    Ans (4)
  42. Taurine is biosynthesized from which amino acid
    1. leucine
    2. arginine
    3. cysteine
    4. valine
    Ans (3)
  43. Valine enters the TCA cycle at which level
    1. alpha ketoglutarate
    2. fumarate
    3. succinyl Co A
    4. acetyl CoA
    Ans (3)
  44. FIGLU is an intermediate in the metabolism of
    1. valine
    2. histidine
    3. methionine
    4. arginine
    Ans(2)
  45. GABA(Gamma amino butyric acid) is synthesized from
    1. fumarate
    2. glutamate
    3. histidine
    4. glycine
    Ans (2)
  46. All the following are derivatives of histidine
    1. carnosine
    2. ergothioneine
    3. anserine
    4. homocysteine
    Ans (4)
  47. Segawa syndrome is due to the deficiency of
    1. tetrahydrobiopterin
    2. pantothenic acid
    3. biotin
    4. tetrahydrofolic acid
    Ans (1)
  48. Xanthurenic aciduria is seen in the deficiency of
    1. vitamin B2
    2. vitamin B3
    3. vitamin B5
    4. vitamin B6
    Ans (4)
  49. A defect in the metabolism of _________ is associated with coronary artery disease
    1. branched amino acid
    2. aromatic amino acid
    3. sulfur-containing amino acid
    4. imino acid
    Ans (3)
  50. Maple syrup urine disease is due to the defect of
    1. decarboxylation
    2. oxidation
    3. carboxylation
    4. deamination
    Ans (1)

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