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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
b) 1.5 nm
c) 3 nm
d) 1.83 nm
Q.2- Which is an antibiotic peptide out of the following?
a) Bleomycin
b) Penicillin
c) Microcystin
d) Creatine
Q.3- Which protein out of the given has a length: width ratio >10?
a) Hemoglobin
b) Myoglobin
c) Fibrinogen
d) Albumin
Q.4- Which of the following amino acids is abundantly found in collagen?
a) Glycine
b) Serine
c) Alanine
d) Tryptophan
Q.5- Choose the incorrect statement about the peptide bond out of the following.
a) Partial double bond character
b) Stable
c) Trans in configuration
d) Charged and polar
Q.6- Which of the following is a confirmatory test for Tryptophan?
a) Sakaguchi test
b) Ninhydrin test
c) Hopkin Cole test
d) Millon’s test
Q.7- Pulses contain incomplete protein since they lack which of the following?
a) Lysine
b) Tryptophan
c) Phenylalanine
d) Methionine
Q.8- All of the following are interactions that stabilize the tertiary structure of a protein except-
a) Vander Waal’s
b) Hydrogen
c) Peptide
d) Ionic
Q.9- Which of the following is NOT a non-standard amino acid?
a) Hydroxy Proline
b) Beta-Alanine
c) Ornithine
d) Arginine
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
Q.11- Which of the following is not a conjugated protein?
a) Albumin
b) Low-density lipoprotein
c) Glycoprotein
d) Visual purple
Q.12- Which of the following features is not observed at the isoelectric pH of a protein?
a) Maximum solubility
b) Minimum electrophoretic migration
c) Maximum precipitation
d) Maximum viscosity
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
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
Q.15- Which of the following amino acids is a precursor of niacin (Vitamin)?
a) Tyrosine
b) Threonine
c) Tryptophan
d) Phenylalanine
Q.16- Which of the following peptides is cyclic in nature?
a) Glutathione
b) Gramicidin-S
c) Met encephalin
d) Leuencephalin
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
Q.18- Which of the following is the most potent vasoconstrictor peptide?
a) Vasopressin
b) Angiotensin II
c) Bradykinin
d) Angiotensinogen
Q.19- Which of the following amino acids is detected by the Sakaguchi test?
a) Tyrosine
b) Tryptophan
c) Alpha-amino acids
d) Arginine
Q.20- Which of the following proteins does not possess a quaternary structure?
a) Myoglobin
b) Lactate dehydrogenase
c) Immunoglobulin M
d) Creatine Phospho Kinase
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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