PG NEET Biochemistry Mcqs 7 – Amino Acids

  1. Guanidinium group is associated with

1. Tyrosine
2. Arginine
3. histidine
4. lysine

Ans (2)

2. Indole ring is present in

  1. tryptophan
  2. tyrosine
  3. phenylalanine
  4. threonine

Ans (1)

3. Simplest amino acid is

  1. tryptophan
  2. valine
  3. glycine
  4. arginine

Ans (3)

4. Amino acids with its pKa value within physiological range is

  1. glycine
  2. histidine
  3. lysine
  4. arginine

Ans (2)

5. Aromatic amino acids are

  1. tryptophan
  2. homocysteine
  3. arginine
  4. ornithine

Ans (1)

6. Sulfur containing amino acid is

  1. ornithine
  2. asparagine
  3. methionine
  4. glycine

Ans (3)

7. Basic amino acids are

  1. alanine
  2. histidine
  3. glutamine
  4. leucine

Ans (2)

8. Following are polar amino acids are

  1. isoleucine
  2. serine
  3. arginine
  4. histidine

Ans (1)

9. Which of the following is polar

  1. isoleucine
  2. methionine
  3. glutamic acid
  4. tryptophan

Ans (3)

10. Neutral amino acids are

  1. aspartate
  2. arginine
  3. glycine
  4. histidine

Ans (3)

11. Polar amino acids are all except

  1. glutamic acid
  2. histidine
  3. glutamine
  4. methionine

Ans (4)

12. Amino acid with aliphatic side chain is

  1. serine
  2. leucine
  3. threonine
  4. aspartate

Ans (2)

13. Hydrophobic amino acids are all except

  1. asparagine
  2. isoleucine
  3. tyrosine
  4. alanine

Ans (1)

14. Non-polar amino acids are all except

  1. alanine
  2. trytophan
  3. isoleucine
  4. lysine

Ans (4)

15. Basic amino acids are all except

  1. arginine
  2. proline
  3. lysine
  4. histidine

Ans (2)

16. Substitution of which one of the following amino acids in place of alanine would increase the absorbance of protein at 280 nm

  1. leucine
  2. arginine
  3. tryptophan
  4. proline

Ans (3)

17. 250nm light is absorbed by

  1. arginine
  2. alanine
  3. tyrosine
  4. histidine

Ans (3)

18. Which of the following amino acids have side chains that are negatively charged under physiological conditions

  1. aspartic acid
  2. histidine
  3. tyrosine
  4. serine

Ans (1)

19. Which of the following can be a homologous substitution for isoleucine in a protein sequence

  1. methionine
  2. aspartic acid
  3. valine
  4. arginine

Ans (3)

20. Amino acid residue having an imino side chain is

  1. lysine
  2. histidine
  3. tyrosine
  4. proline

Ans (4)

21. Flexibility of protein chain is determined by

  1. glycine
  2. tryptophan
  3. serine
  4. proline

Ans (1)

22. Which of the following amino acids is purely ketogenic

  1. lysine
  2. arginine
  3. leucine
  4. methionine

Ans (3)

23. Change of valine to which amino acid leads to no change in function

  1. lysine
  2. proline
  3. leucine
  4. tyrosine

Ans (3)

24. Which has a free sulfhydryl group

  1. trypsin
  2. cysteine
  3. methionine
  4. alanine

Ans (2)

25. Nonprotein amino acid is

  1. aspartate
  2. ornithine
  3. histidine
  4. tyrosine

Ans (2)

26. Essential amino acids are named so

1. Because they are produced in the body
2. Because they are not produced in the body in adequate amounts
3. they are not important for life
4. Every foodstuff essentially contains them

Ans (2)

27. Nonessential amino acid is

  1. not needed in the diet
  2. not essential for growth
  3. not required for protein synthesis
  4. not synthesized in the body

Ans (1)

28. Semi-essential amino acid is

  1. phenylalanine
  2. lysine
  3. tryptophan
  4. arginine

Ans (4)

 

29. Negative nitrogen balance is produced in humans by elimination from the diet of all the amino acids except

  1. leucine
  2. methionine
  3. lysine
  4. serine

Ans (4)

30. Interaction involves in primary structure of protein

  1. hydrogen bond
  2. disulfide bond
  3. peptide bond
  4. electrostatic bond

Ans (3)

31. Alpha helix and beta pleated sheet are examples of

  1. primary structure
  2. secondary structure
  3. tertiary structure
  4. quaternary structure

Ans (2)

32. True about alpha helix structure

  1. extended structure
  2. a hydrogen bond between peptides
  3. hydrogen bond within the peptide
  4. an electrostatic bond between two adjacent peptides

(3)

33. An amino acid that is incompatible with an alpha helix is

  1. asparagine
  2. proline
  3. valine
  4. tryptophan

(2)

34. Amino acid that produces kinks in the βpleated structure of protein is

  1. glycine
  2. serine
  3. proline
  4. alanine

Ans (3)

35. Tertiary structure of protein does not contain

  1. hydrogen bonds
  2. inter polypeptide disulfide bonds
  3. salt linkage
  4. Vander Waal’s bonds

Ans (2)

36. Cytochrome C of the bacteria has 50% identity of amino acid sequence with that of human. Which of the following is the most conserved parameter in these two proteins

  1. quarternary structure
  2. tertiary structure
  3. an amino acid sequence
  4. loop and turn segments

Ans (2)

37. Tertiary structure of protein is studied with

  1. hydrolysis
  2. diffusion
  3. X-Ray diffraction technique
  4. immunodiffusion

Ans (3)

38. Vibrational structure of protein is due to ……………… structure

  1. primary
  2. secondary
  3. tertiary
  4. quarternary

Ans (3)

39. Proteins are linear polymers of amino acid. They fold into a compact structure. Sometimes these folded structures associate to form homo or heterodimers. Which one of the following refers to this associated form?

  1. denatured state
  2. molecular aggregation
  3. precipitation
  4. quarternary structure

Ans (4)

40. Quarternary structure of protein is

  1. The arrangement sequence of amino acid in the polypeptide chain
  2. interrelation of amino acid in a single polypeptide chain
  3. interrelation of amino acid in 2 polypeptide chain
  4. interrelation of amino acid in more than 2 polypeptide chain

Ans (4)

41. Which is a denaturing agent

  1. guanidine
  2. glutamate
  3. glycine
  4. guanosine

Ans (1)

42. TRUE about denaturation of protein

  1. the biological property is lost
  2. the primary structure is lost
  3. always irreversible
  4. proteins are soluble

Ans (1)

43. Which of the following bond is preserved during denaturation of protein

  1. hydrogen bond
  2. peptide bond
  3. ionic bond
  4. all the other answers are right

Ans (2)

44. Triple helix structure is characteristic of which protein in the body

  1. collagen
  2. keratin
  3. hemoglobin
  4. myoglobin

Ans (2)

45. Amino acid which does not allow the formation of alpha helix is

  1. glutamate
  2. proline
  3. lysine
  4. histidine

Ans (2)

46. All are true about chaperones except

  1. cause folding of proteins
  2. are lipid in nature
  3. may have ATPase activity
  4. includes heat shock proteins

Ans (2)

47. Folding of proteins is done by

  1. GLUT1
  2. calnexin
  3. cytochrome 450
  4. insulin receptor

Ans (2)

48. All are essential amino acid except

  1. phenylalanine
  2. lysine
  3. leucine
  4. glycine

Ans (4)

49. If the cellular protein does not fold into a specific conformation, their function is affected. Certain disorders arise if specific proteins are misfolded. Which of the following disorders arise due to conformational isomerization?

  1. familial fatal insomnia
  2. hepatitis delta
  3. pernicious anemia
  4. Lesch-Nyhan syndrome

Ans (1)

50. Chaperones are

  1. mediators of the post-translation assembly of protein complexes
  2. antigen presenting cells
  3. purine metabolism mediators
  4. ketogenic amino acid

Ans (1)

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