Proteins And Protein Metabolism Set 1

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Biochemistry (Proteins And Protein Metabolism Set 1)

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1. 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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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

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3. An essential amino acid in man is

A) Aspartate

B) Tyrosine

C) Methionine

D) Serine

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4. 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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5. An amino acid that does not form an αhelix is

A) Valine

B) Proline

C) Tyrosine

D) Tryptophan

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6. The functions of plasma albumin are

A) Osmosis

B) Transport

C) Immunity

D) both (A )and (B)

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

A) Methionine

B) Glycine

C) Tryptophan

D) Phenylalanine

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

A) Cysteine

B) Cystine

C) Methionine

D) Threonine

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10. 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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11. An example of polar amino acid is

A) Alanine

B) Leucine

C) Arginine

D) Valine

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12. Biuret reaction is specific for

A) –CONH-linkages

B) –CSNH2 group

C) –(NH)NH2 group

D) All of these

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13. An aromatic amino acid is

A) Lysine

B) Tyrosine

C) Taurine

D) Arginine

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

A) Valine

B) Arginine

C) Lysine

D) Tyrosine

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15. The amino acid with a nonpolar side chain
is

A) Serine

B) Valine

C) Asparagine

D) Threonine

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16. 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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17. 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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18. 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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19. 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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20. The optically inactive amino acid is

A) Glycine

B) Serine

C) Threonine

D) Valine

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21. pH (isoelectric pH) of alanine is

A) 6.02

B) 6.6

C) 6.8

D) 7.2

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22. Sulphur containing amino acid is

A) Methionine

B) Leucine

C) Valine

D) Asparagine

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23. 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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24. An amino acid not found in proteins is

A) β-Alanine

B) Proline

C) Lysine

D) Histidine

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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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