Protein & Protein Metabolism (Biochemistry) BSc MCQs Set-2

Biochemistry Mcqs

1.Which of the following is a tripeptide? 

(A) Anserine 
(B) Oxytocin 
(C) Glutathione
(D) Kallidin

Answer:(C) Glutathione

2. A peptide which acts as potent smooth muscle hypotensive agent is 

(A) Glutathione 
(B) Bradykinin
(C) Tryocidine 
(D) Gramicidin-s 

Answer:(C) Glutathione

3. A tripeptide functioning as an important reducing agent in the tissues is 

(A) Bradykinin 
(B) Kallidin 
(C) Tyrocidine
(D) Glutathione 

Answer:(D) Glutathione

4. An example of metalloprotein is 

(A) Casein 
(B) Ceruloplasmin 
(C) Gelatin 
(D) Salmine

Answer: (B) Ceruloplasmin

5. Carbonic anhydrase is an example of 

(A) Lipoprotein 
(B) Phosphoprotein
(C) Metalloprotein 
(D) Chromoprotein

Answer: (C) Metalloprotein

6. An example of chromoprotein is 

(A) Hemoglobin 
(B) Sturine 
(C) Nuclein 
(D) Gliadin

Answer: (A) Hemoglobin

7. An example of scleroprotein is 

(A) Zein 
(B) Keratin 
(C) Glutenin 
(D) Ovoglobulin

Answer: (B) Keratin

8. Casein, the milk protein is 

(A) Nucleoprotein
(B) Chromoprotein 
(C) Phosphoprotein 
(D) Glycoprotein

Answer: (C) Phosphoprotein

9. An example of phosphoprotein present in egg yolk is 

(A) Ovoalbumina 
(B) Ovoglobulin 
(C) Ovovitellin 
(D) Avidin

Answer: (C) Ovovitellin

10. A simple protein found in the nucleoproteins of the sperm is 

(A) Prolamine 
(B) Protamine 
(C) Glutelin
(D) Globulin

Answer: (B) Protamine

11. Histones are 

(A) Identical to protamine 
(B) Proteins rich in lysine and arginine
(C) Proteins with high molecular weight 
(D) Insoluble in water and very dilute acids

Answer: (B) Proteins rich in lysine and arginine

12. The protein present in hair is 

(A) Keratin 
(B) Elastin 
(C) Myosin 
(D) Tropocollagen 

Answer:(A) Keratin

13. The amino acid from which synthesis of the protein of hair keratin takes place is 

(A) Alanine 
(B) Methionine
(C) Proline 
(D) Hydroxyproline

Answer: (B) Methionine

14. In one molecule of albumin the number of amino acids is 

(A) 510 
(B) 590 
(C) 610 
(D) 650 

Answer:(C) 610

15. Plasma proteins which contain more than 4% hexosamine are 

(A) Microglobulins
(B) Glycoproteins 
(C) Mucoproteins 
(D) Orosomucoids 

Answer:(C) Mucoproteins

16. After releasing O2 at the tissues, hemoglobin transports 

(A) CO2 and protons to the lungs 
(B) O2 to the lungs 
(C) CO2 and protons to the tissue 
(D) Nutrients 

Answer:(A) CO2 and protons to the lungs

17. Ehlers-Danlos syndrome characterized by hypermobile joints and skin abnormalities is due to 

(A) Abnormality in gene for procollagen 
(B) Deficiency of lysyl oxidase 
(C) Deficiency of prolyl hydroxylase 
(D) Deficiency of lysyl hydroxylase

Answer: (A) Abnormality in gene for procollagen

18. Proteins are soluble in 

(A) Anhydrous acetone
(B) Aqueous alcohol 
(C) Anhydrous alcohol 
(D) Benzene 

Answer:(B) Aqueous alcohol 

19. A cereal protein soluble in 70% alcohol but insoluble in water or salt solution is

(A) Glutelin
(B) Protamine 
(C) Albumin 
(D) Gliadin

Answer: (D) Gliadin

20. Many globular proteins are stable in solution in spite they lack in 

(A) Disulphide bonds 
(B) Hydrogen bonds 
(C) Salt bonds 
(D) Non polar bonds

Answer: (A) Disulphide bonds

21. The hydrogen bonds between peptide linkages of a protein molecules are interfered by 

(A) Guanidine 
(B) Uric acid 
(C) Oxalic acid 
(D) Salicylic acid

Answer:(A) Guanidine

22. Globular proteins have completely folded, coiled polypeptide chain and the axial ratio (ratio of length to breadth) is 

(A) Less than 10 and generally not greater than 3–4 
(B) Generally 10 
(C) Greater than 10 and generally 20 
(D) Greater than 10 

Answer:(A) Less than 10 and generally not greater than 3–4

23. Fibrous proteins have axial ratio 

(A) Less than 10 
(B) Less than 10 and generally not greater than 3–4 
(C) Generally 10 
(D) Greater than 10 

Answer:(D) Greater than 10

24. Each turn of α-helix contains the amino acid residues (number): 

(A) 3.6 
(B) 3.0 
(C) 4.2 
(D) 4.5

 Answer:(A) 3.6

25. Distance traveled per turn of α−helix in nm is 

(A) 0.53 
(B) 0.54 
(C) 0.44 
(D) 0.48 

Answer:(B) 0.54

26. Along the α-helix each amino acid residue advances in nm by 

(A) 0.15 
(B) 0.10 
(C) 0.12 
(D) 0.20 

Answer:(A) 0.15

27. The number of helices present in a collagen molecule is 

(A) 1 
(B) 2 
(C) 3 
(D) 4 

Answer:(C) 3

28. In proteins the α-helix and β-pleated sheet are examples of 

(A) Primary structure 
(B) Secondary structure 
(C) Tertiary structure 
(D) Quaternary structure 

Answer:(B) Secondary structure

29. The a-helix of proteins is 

(A) A pleated structure 
(B) Made periodic by disulphide bridges 
(C) A non-periodic structure 
(D) Stabilised by hydrogen bonds between NH and CO groups of the main chain

Answer:(C) A non-periodic structure

30. At the lowest energy level α-helix of polypeptide chain is stabilised 

(A) By hydrogen bonds formed between the H of peptide N and the carbonyl O of the residue
(B) Disulphide bonds 
(C) Non polar bonds 
(D) Ester bonds

Answer:(A) By hydrogen bonds formed between the H of peptide N and the carbonyl O of the residue