Quiz on Protein Structure Denaturation | Biochemistry Quiz

1. During denaturation, proteins will not lose their structure, will regard to
Primary structure
Secondary structure
Tertiary structure
Quaternary structure
2. All the following reagents are used for identifying the first amino acid in a protein, except
Cyanogen bromide
Dansyl chloride
Phenyl isothiocyanate
Fluorodinitro benzene
3. Proteins may be denatured irreversibly by:
Adding urea
Bringing to iso-electric pH
Heat coagulation
Reduction with mercaptoethanol
4.Tertiary sructure of a protein describes
Sequence of aminoacids
Location of disulphide bonds
The nature of protein folding
Amino terminal end amino acid
5. The protein which does not answer the aldehyde test
Hemoglobinn
Albumin
Casein
Gelatin
6. Denatured proteins
are soluble
are difficult to digest
are biologically inactive
peptide bonds are broken
7. The force maintaining the primary structure of a protein?
Peptide bonds
Hydrophobic forces
Hydrogen bonds
Electrostatic bonds
8. The characteristic featres of the peptide bond include all the following, except:
Does not allow freedom of rotation
It is partial double bond
Always has cis configuration
Absorbs UV light at 220nm
9.Ultraviolet light at 280nm is absorbed by which componenet of proteins?
Peptide bonds
Sulfhydryl group of cysteine
imidazole ring of proline
have aromatic ring structure
10. Proteins can be precipitated by the following methods,except
adding alchol and acetone
saturarion with ammonium suplphat
using salts of heavy metals
shifting the pH away from iso electric point
Score =
Correct answers: