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PROTEINS & AMINO ACIDS
1
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The most important function of proteins in our body is:
a) Emulsification
b) Thermal insulation
c) Storage
d) Catalysis
e) Energy production
3
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The following amino acids contain two carboxylic groups:
a) D and E
b) Q and Y
c) A and K
d) C and M
e) H and R
5
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The primary structure of proteins:
a) Refers to the sequence of amino acids in the polypeptide chain
b) Refers to the helical structure of the protein
c) Describes the beta-pleated sheets
d) Is maintained by hydrogen bonds
e) Is maintained by hydrophobic interactions

7
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The alpha helix in a protein:
a) Refers to its tertiary structure
b) Is not affected by amino acid sequence
c) Is stabilized by covalent bonds
d) Refers to its secondary structure
e) Is the quaternary structure
9
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The following amino acids contain two carboxylic groups:
a) Aspartate and Glutamate
b) Asparagines and Glutamine
c) Glutamine and Aspartate
d) Proline and Glutamate
e) Glycine and Methionine
11
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Sulphur containing amino acids:
a) Are non-polar
b) Include cysteine and methionine
c) Are involved in disulphide bridges
d) Are involved in methyl group donation
e) Are non essential amino acids
13
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The following are classified as acidic amino acids:
a) H and R
b) D and E
c) E and Y
d) A and K
e) C and D
15
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Hemoglobin and myoglobin have the same:
a) Oxygen affinity
b) Primary structure
c) Quaternary structure
d) Prosthetic group
e) Molecular weight
17
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Hemoglobin and myoglobin:
a) Have the same oxygen affinity
b) Are found in red blood cells
c) Are multimeric protein structures
d) Contain heme
e) Have the same molecular weight
19
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Hemoglobin and cytochromes:
a) Contain Fe3+ as part of the active site
b) Contain heme as prosthetic group
c) Transports oxygen
d) Have similar affinity for oxygen
e) Are found in the mitochondria

21
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Properties of the peptide bond include:
a) It is a covalent double bond
b) It links to alpha amino acids covalently
c) It is weaker than the hydrogen bond
d) It can be broken by mild heating
e) None of the above
23
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Negatively charged amino acids:
a) Are serine and glutamate
b) Include glutamine and asparagene
c) Are necessary for protein-protein interactions
d) Are not found in membrane bound proteins
e) Form disulphide bridges
25
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Albumin is:
a) Synthesized in the liver
b) Water-soluble protein
c) A carrier of bilirubin and calcium
d) Decreased in blood and in protein calorie malnutrition
e) All of the above
27
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All of the following are considered "weak interactions" in proteins except:
a) Van der Waals force
b) Hydrogen bonds
c) Ionic bonds
d) Peptide bonds
e) Hydrophobic interactions
29
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Globular proteins:
a) Are structural proteins
b) Include peptide hormones
c) Are always found in the plasma membrane
d) Are relatively water insoluble
e) Are always glycosylated
31
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Glycoproteins contain sugar residues covalently boded to:
a) Threonine and serine
b) Leucine and arginine
c) Asparagine and glycine
d) Cysteine and histidine
e) Lysine and methionine
33
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Enzymes involved in protein digestion are mainly produced by:
a) Stomach
b) Duodenum
c) Jejunum
d) Ileum
e) Pancreas

35
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The following amino acids have nonpolar side chains:
a) Valine and serine
b) Methionine and leucine
c) Arginine and alanine
d) Glycine and asparagine
e) Isoleucine and valine
37
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Which of the following amino acids is most likely to be found in the
transmembrane region of a protein?
a) Lysine
b) Arginine
c) Leucine
d) Aspartate
e) Glutamate
39
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The sequence of amino acids are found in the cell but not in protein?
a) Glycine-cysteine-glutamate
b) Cysteine-glycine-glutamate
c) Glycine-glutamate-cysteine
d) Glutamate-cysteine-glycine
e) Glutamate-glycine-cysteine
41
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Properties of the peptide bond include:
a) It is a covalent double bond
b) It links three alpha-amino acids covalently
c) It is stronger than the hydrogen bond
d) It can be broken by mild heating
e) None of the above
43
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6 amino acid residues per turn
c) Proline favors its formation
d) Denotes secondary structure of a protein
e) Can be found in a tripeptide
44
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The amino acids with positively charged side chains include:
a) Arginine and serine
b) Glutamine and alanine
c) Glutamate and proline
d) Glutamine and tyrosine
e) Arginine and lysine
46
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The tertiary structure of a protein is:
a) Its three dimensional structure
b) The relationship between different subunits
c) Not lost by denaturation
d) Stabalized by peptide bonds only
e) Not relevant to its function
48
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Non standard amino acids in protein structure include:
a) Ornithine
b) Citrulline
c) Hydroxyproline
d) Serine
e) Glycine
50

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