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Biochemistry MCQs PROTEINS & AMINO ACIDS
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PROTEINS & AMINO ACIDS1. The peptide bond:
a) Links two amino acids
b) Links two nucleotides
c) Is weaker than the hydrogen bond
d) Is broken by mild heating
e) Is a non-covalent bond
2. The most important function of proteins in our body is:
a) Emulsification
b) Thermal insulation
c) Storage
d) Catalysis
e) Energy production
3. Aliphatic non polar amino acids are exemplified by:
a) Isoleucine and Serine
b) Histidine and Alanine
c) Cysteine and Valine
d) Aspartate and Glycine
e) Valine and Isoleucine
4. 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. Positively charged amino acids are:
a) P and R
b) L and T
c) K and R
d) H and M
e) N and F
6. 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. Denaturation of a protein involves loss of its:
a) Primary structure
b) Secondary & Tertiary structure
c) Primary & Tertiary structure
d) Primary & Quaternary structure
e) Amino acids
8. 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. Glycoproteins contain sugar residues covalently bonded to:
a) Lysine
b) Methionine
c) Leucine
d) Asparagine
e) Cysteine
10. 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. Positively charged amino acids are:
a) Valine and Arginine
b) Leucine and Lysine
c) Lysine and Arginine
d) Histidine and Cystine
e) Arginine and Glutamine
12. 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. The alpha helix in a protein:
a) Describes the secondary structure
b) Is stabilized by peptide bonds
c) Stabalized by hydrogen bonds between NH and CO main chain groups
d) Is the basis for quaternary structure formation
e) Dictates its tertiary structure
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