Biochemistry MCQ Quiz Hub

1. Which of the following makes water a liquid at room temperature?
Noncovalent interactions
Hydrogen bonds between water molecules
Van der Waals forces of attraction
Covalent bonding

2. The heat of vaporization of water is ________
2260 J/g
2060 kJ/g
1060 J/g
1260 kJ/g

3. The degree of ionization does not depend on which of the following parameter?
Nature of solvent
Temperature
Concentration
Current

4. The degree of ionization does not depend on which of the following parameter?
Nature of solvent
Temperature
Concentration
Current

5. Which of the following mixture in aqueous solution of equimolar concentration acts as a buffer solution?
NH4 OH(excess) + HCl
HNO3 + NaOH
CH3 COOH + NaOH(excess)
H2 SO4 + KOH

6. Which of the following is an imino acid?
Serine
Alanine
Glycine
Proline

7. Which of the following is a 39-residue hormone of the anterior pituitary gland?
Glucagon
Bradykinin
Corticotropin
Insulin

8. Which of the following is a 39-residue hormone of the anterior pituitary gland?
Glucagon
Bradykinin
Corticotropin
Insulin

9. Which of the following is a 39-residue hormone of the anterior pituitary gland?
Glucagon
Bradykinin
Corticotropin
Insulin

10. Which of the following statements is correct about column chromatography?
Resolution improves as column length increases
Mobile phase is a porous solid material kept in the column with appropriate chemical characteristics
Stationary phase is a buffered solution that percolates through the mobile phase
Large proteins exit the column faster than tiny proteins

11. Who deduced the double-helical structure of DNA?
Watson and Francis Crick
Frederick Sanger
Anton van Leeuwenhoek
Mendel

12. The amino acid sequences of thousands of different proteins from many species have been determined using principles first developed by?
Watson and Crick
Edman
Sanger
Mendel

13. The stability of an α-helix is not affected by which of the following?
Bulkiness
Occurrence of alanine and glycine residues
Electrostatic repulsion
Interaction between R groups spaced three residues apart

14. Which of the following is abundantly found in collagen?
Tryptophan
Alanine
Glycine
Serine

15. Which of the following is a function of chaperone protein?
It provides a template for how the proteins should fold
It degrades proteins that have folded properly
It degrades proteins that have folded improperly
It rescues proteins that have folded improperly and allowed them to refold properly

16. The relationship between oxygen concentration and the fraction of binding sites occupied in myoglobin can best be described as ________
Linear with a positive slope
Hyperbolic
Parabolic
Linear with a negative slope

17. When compared to the first immune response to the same antigen, which of the following is not a hallmark of the secondary immune response?
Antibody is generated fast
Many antibodies is produced
Antibody is generated without T-cell help
Antibody produced has a greater affinity for the antigen

18. Which of the following is an invagination of the muscle cell’s sarcolemma?
T tubules
Sarcoplasmic reticula
Microtubules
Cisternae

19. When the velocity of enzyme activity is plotted against substrate concentration, which of the following is obtained?
Straight line with negative slope
Straight line with positive slope
Parabola
Hyperbolic curve

20. Which of the following catalyzes the reversible degradation of 2-phosphoglycerate to phosphoenolpyruvate?
Trypsin
Enolase
Chymotrypsin
Hexokinase

21. Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism?
Bacterial dinitrogenase reductase
Phosphatase
Bacterial glutamine synthase
Bacterial dinitrogenase oxidase

22. Which of the following is an example of epimers?
Mannose & Glucose
Glucose & Ribose
Galactose & Mannose
Glucose & Galactose

23. In which of the following, glucose residues are linked by β1 &arr; 4 glycosidic bonds?
Starch
Cellulose
Glycogen
Amylose