Proteins And Protein Metabolism Set 1

/25

Biochemistry (Proteins And Protein Metabolism Set 1)

1 / 25

1. All the following are sulphur containing
amino acids found in proteins except

A) Cysteine

B) Cystine

C) Methionine

D) Threonine

2 / 25

2. All proteins contain the

A) Same 20 amino acids

B) Different amino acids

C) 300 Amino acids occurring in nature

D) Only a few amino acids

3 / 25

3. An essential amino acid in man is

A) Aspartate

B) Tyrosine

C) Methionine

D) Serine

4 / 25

4. At neutral pH, a mixture of amino acids
in solution would be predominantly:

A) Dipolar ions

B) Nonpolar molecules

C) Positive and monovalent

D) Hydrophobic

5 / 25

5. The amino acid with a nonpolar side chain
is

A) Serine

B) Valine

C) Asparagine

D) Threonine

6 / 25

6. Biuret reaction is specific for

A) –CONH-linkages

B) –CSNH2 group

C) –(NH)NH2 group

D) All of these

7 / 25

7. An aromatic amino acid is

A) Lysine

B) Tyrosine

C) Taurine

D) Arginine

8 / 25

8. pH (isoelectric pH) of alanine is

A) 6.02

B) 6.6

C) 6.8

D) 7.2

9 / 25

9. Sulphur containing amino acid is

A) Methionine

B) Leucine

C) Valine

D) Asparagine

10 / 25

10. The functions of plasma albumin are

A) Osmosis

B) Transport

C) Immunity

D) both (A )and (B)

11 / 25

11. An example of sulphur containing amino
acid is

A) 2-Amino-3-mercaptopropanoic acid

B) 2-Amino-3-methylbutanoic acid

C) 2-Amino-3-hydroxypropanoic acid

D) Amino acetic acid

12 / 25

12. An amino acid that does not form an αhelix is

A) Valine

B) Proline

C) Tyrosine

D) Tryptophan

13 / 25

13. Non essential amino acids

A) Are not components of tissue proteins

B) May be synthesized in the body from essential amino acids

C) Have no role in the metabolism

D) May be synthesized in the body in diseased states

14 / 25

14. A vasodilating compound is produced by
the decarboxylation of the amino acid:

A) Arginine

B) Aspartic acid

C) Glutamine

D) Histidine

15 / 25

15. Since the pK values for aspartic acid are
2.0, 3.9 and 10.0, it follows that the
isoelectric (pH) is

A) 3.0

B) 3.9

C) 5.9

D) 6.0

16 / 25

16. The optically inactive amino acid is

A) Glycine

B) Serine

C) Threonine

D) Valine

17 / 25

17. A ketogenic amino acid is

A) Valine

B) Cysteine

C) Leucine

D) Threonine

18 / 25

18. Which one of the following is semiessential amino acid for humans?

A) Valine

B) Arginine

C) Lysine

D) Tyrosine

19 / 25

19. An amino acid not found in proteins is

A) β-Alanine

B) Proline

C) Lysine

D) Histidine

20 / 25

20. Amino acid with side chain containing
basic groups is

A) 2-Amino 5-guanidovaleric acid

B) 2-Pyrrolidine carboxylic acid

C) 2-Amino 3-mercaptopropanoic acid

D) 2-Amino propanoic acid

21 / 25

21. An example of α-amino acid not present
in proteins but essential in mammalian
metabolism is

A) 3-Amino 3-hydroxypropanoic acid

B) 2-Amino 3-hydroxybutanoic acid

C) 2-Amino 4-mercaptobutanoic acid

D) 2-Amino 3-mercaptopropanoic acid

22 / 25

22. Proteins contain

A) Only L- α - amino acids

B) Only D-amino acids

C) DL-Amino acids

D) Both (A) and (B)

23 / 25

23. An example of polar amino acid is

A) Alanine

B) Leucine

C) Arginine

D) Valine

24 / 25

24. The true statement about solutions of
amino acids at physiological pH is

A) All amino acids contain both positive and negative charges

B) All amino acids contain positively charged side chains

C) Some amino acids contain only positive charge

D) All amino acids contain negatively charged side chains

25 / 25

25. In mammalian tissues serine can be a
biosynthetic precursor of

A) Methionine

B) Glycine

C) Tryptophan

D) Phenylalanine

Your score is

The average score is 64%

Proteins And Protein Metabolism Set 1

Follow Us on Social Media