Proteins And Protein Metabolism Set 1

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Biochemistry (Proteins And Protein Metabolism Set 1)

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1. Biuret reaction is specific for

A) –CONH-linkages

B) –CSNH2 group

C) –(NH)NH2 group

D) All of these

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

A) Valine

B) Proline

C) Tyrosine

D) Tryptophan

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3. An aromatic amino acid is

A) Lysine

B) Tyrosine

C) Taurine

D) Arginine

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

A) Arginine

B) Aspartic acid

C) Glutamine

D) Histidine

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5. 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

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6. Proteins contain

A) Only L- α - amino acids

B) Only D-amino acids

C) DL-Amino acids

D) Both (A) and (B)

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

A) Cysteine

B) Cystine

C) Methionine

D) Threonine

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8. The functions of plasma albumin are

A) Osmosis

B) Transport

C) Immunity

D) both (A )and (B)

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9. 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

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10. pH (isoelectric pH) of alanine is

A) 6.02

B) 6.6

C) 6.8

D) 7.2

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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

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12. An essential amino acid in man is

A) Aspartate

B) Tyrosine

C) Methionine

D) Serine

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13. Sulphur containing amino acid is

A) Methionine

B) Leucine

C) Valine

D) Asparagine

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14. An amino acid not found in proteins is

A) β-Alanine

B) Proline

C) Lysine

D) Histidine

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15. 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

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16. The optically inactive amino acid is

A) Glycine

B) Serine

C) Threonine

D) Valine

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17. 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

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18. 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

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19. The amino acid with a nonpolar side chain
is

A) Serine

B) Valine

C) Asparagine

D) Threonine

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

A) Methionine

B) Glycine

C) Tryptophan

D) Phenylalanine

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21. 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

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22. 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

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23. An example of polar amino acid is

A) Alanine

B) Leucine

C) Arginine

D) Valine

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

A) Valine

B) Arginine

C) Lysine

D) Tyrosine

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25. A ketogenic amino acid is

A) Valine

B) Cysteine

C) Leucine

D) Threonine

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Proteins And Protein Metabolism Set 1

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