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Protein Chemistry-Multiple-choice questions
Q.1- The alpha helix rises per turn a distance of which of the following?
a) 0.54 nm                                                                         Â
b) 1.5 nm
c) 3 nm                                                               Â
d) 1.83 nm                         Â
Q.2- Which is an antibiotic peptide out of the following?
a) Bleomycin                                                                    Â
b) Penicillin
c) Microcystin                                                               Â
d) Creatine                       Â
Q.3- Which protein out of the given has a length: width ratio >10?
a) Hemoglobin                                                                Â
b) Myoglobin
c) Fibrinogen                                                                    Â
d) Albumin                        Â
Q.4- Which of the following amino acids is abundantly found in collagen?
a) Glycine                                                          Â
b) Serine
c) Alanine                                                                          Â
d) Tryptophan                 Â
Q.5- Choose the incorrect statement about the peptide bond out of the following.
a) Partial double bond character                             Â
b) Stable
c) Trans in configuration                                              Â
d) Charged and polar    Â
Q.6- Which of the following is a confirmatory test for Tryptophan?
a) Sakaguchi test                                                            Â
b) Ninhydrin test
c) Hopkin Cole test                                                        Â
d) Millon’s test                Â
Q.7- Pulses contain incomplete protein since they lack which of the following?
a) Lysine                                                                            Â
b) Tryptophan
c) Phenylalanine                                                            Â
d) Methionine                 Â
Q.8- All of the following are interactions that stabilize the tertiary structure of a protein except-
a) Vander Waal’s                                                            Â
b) Hydrogen
c) Peptide                                                                         Â
d) Ionic                               Â
Q.9- Which of the following is NOT a non-standard amino acid?
a) Hydroxy Proline                                                         Â
b) Beta-Alanine
c) Ornithine                                                                      Â
d) Arginine        Â
Q.10- Choose the right set of amino acids in the structure of Glutathione-
a) Glutamine- Glycine-Cysteine
b) Cysteine-Glycine- Glutamic Acid
c) Glutamic acid- Glycine- Cysteine
d) Glutamic acid- Cysteine- Glycine                                                                        Â
Q.11- Which of the following is not a conjugated protein?
a) Albumin                                                                        Â
b) Low-density lipoprotein
c) Glycoprotein                                                               Â
d) Visual purple                              Â
Q.12- Which of the following features is not observed at the isoelectric pH of a protein?
a) Maximum solubility                                                 Â
b) Minimum electrophoretic migration
c) Maximum precipitation                                          Â
d) Maximum viscosity Â
Q.13- Which of the following is a set of hydrophobic amino acids?
a) Aspartic acid- Valine- Isoleucine
b) Arginine- Lysine- Methionine
c) Hydroxyproline- Histidine- Glutamine
d) Valine- Methionine- Isoleucine                                                          Â
Q.14- Choose the incorrect statement out of the following-
a) Only L amino acids are found in the biological system
b) Glycine is optical inactive
c) Tyrosine is a modified amino acid
d) Seleno cysteine is the 21st amino acid                                                                    Â
Q.15- Which of the following amino acids is a precursor of niacin (Vitamin)?
a) Tyrosine                                                                        Â
b) Threonine
c) Tryptophan                                                                  Â
d) Phenylalanine            Â
Q.16- Which of the following peptides is cyclic in nature?
a) Glutathione
b) Gramicidin-S
c) Met encephalin
d) Leuencephalin                                                                                                           Â
Q.17- Which of the following amino acids is a precursor of a mediator of allergies and inflammation?
a) Histidine
b) Tyrosine
c) Phenylalanine
d) Tryptophan                                                                                                                 Â
Q.18- Which of the following is the most potent vasoconstrictor peptide?
a) Vasopressin                                                                Â
b) Angiotensin II
c) Bradykinin                                                                    Â
d) Angiotensinogen                                                                                                      Â
Q.19- Which of the following amino acids is detected by the Sakaguchi test?
a) Tyrosine                                                                        Â
b) Tryptophan
c) Alpha-amino acids                                                     Â
d) Arginine                                                                                                                        Â
Q.20- Which of the following proteins does not possess a quaternary structure?
a) Myoglobin                                                                   Â
b) Lactate dehydrogenase
c) Immunoglobulin MÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â
d) Creatine Phospho Kinase
                                                                       Â
Key to Answers
1)- a, 2)-b, 3)-c, 4)-a, 5)-d, 6)-c, 7)-d, 8)-c, 9)-d, 10)-d,11)-a, 12)-a,13)-d,14)-c,15)-a, 16)-b,17)-a,18)-b,19)-d, 20)-a.
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