laboursonline – MCQs, Mock Tests | Biochemistry Biochemistry MCQ Set 1

Which of the following makes water a liquid at room temperature?

1. Noncovalent interactions
2. Hydrogen bonds between water molecules
3. Van der Waals forces of attraction
4. Covalent bonding

✅ Correct Answer: 2

The heat of vaporization of water is ________

1. 2260 J/g
2. 2060 kJ/g
3. 1060 J/g
4. 1260 kJ/g

✅ Correct Answer: 2

The degree of ionization does not depend on which of the following parameter?

1. Nature of solvent
2. Temperature
3. Concentration
4. Current

✅ Correct Answer: 4

The degree of ionization does not depend on which of the following parameter?

1. Nature of solvent
2. Temperature
3. Concentration
4. Current

✅ Correct Answer: 4

Which of the following mixture in aqueous solution of equimolar concentration acts as a buffer solution?

1. NH4 OH(excess) + HCl
2. HNO3 + NaOH
3. CH3 COOH + NaOH(excess)
4. H2 SO4 + KOH

✅ Correct Answer: 1

Which of the following is an imino acid?

1. Serine
2. Alanine
3. Glycine
4. Proline

✅ Correct Answer: 4

Which of the following is a 39-residue hormone of the anterior pituitary gland?

1. Glucagon
2. Bradykinin
3. Corticotropin
4. Insulin

✅ Correct Answer: 3

Which of the following is a 39-residue hormone of the anterior pituitary gland?

1. Glucagon
2. Bradykinin
3. Corticotropin
4. Insulin

✅ Correct Answer: 3

Which of the following is a 39-residue hormone of the anterior pituitary gland?

1. Glucagon
2. Bradykinin
3. Corticotropin
4. Insulin

✅ Correct Answer: 3

Which of the following statements is correct about column chromatography?

1. Resolution improves as column length increases
2. Mobile phase is a porous solid material kept in the column with appropriate chemical characteristics
3. Stationary phase is a buffered solution that percolates through the mobile phase
4. Large proteins exit the column faster than tiny proteins

✅ Correct Answer: 1

Who deduced the double-helical structure of DNA?

1. Watson and Francis Crick
2. Frederick Sanger
3. Anton van Leeuwenhoek
4. Mendel

✅ Correct Answer: 1

The amino acid sequences of thousands of different proteins from many species have been determined using principles first developed by?

1. Watson and Crick
2. Edman
3. Sanger
4. Mendel

✅ Correct Answer: 3

The stability of an α-helix is not affected by which of the following?

1. Bulkiness
2. Occurrence of alanine and glycine residues
3. Electrostatic repulsion
4. Interaction between R groups spaced three residues apart

✅ Correct Answer: 2

Which of the following is abundantly found in collagen?

1. Tryptophan
2. Alanine
3. Glycine
4. Serine

✅ Correct Answer: 3

Which of the following is a function of chaperone protein?

1. It provides a template for how the proteins should fold
2. It degrades proteins that have folded properly
3. It degrades proteins that have folded improperly
4. It rescues proteins that have folded improperly and allowed them to refold properly

✅ Correct Answer: 4

The relationship between oxygen concentration and the fraction of binding sites occupied in myoglobin can best be described as ________

1. Linear with a positive slope
2. Hyperbolic
3. Parabolic
4. Linear with a negative slope

✅ Correct Answer: 2

When compared to the first immune response to the same antigen, which of the following is not a hallmark of the secondary immune response?

1. Antibody is generated fast
2. Many antibodies is produced
3. Antibody is generated without T-cell help
4. Antibody produced has a greater affinity for the antigen

✅ Correct Answer: 3

Which of the following is an invagination of the muscle cell’s sarcolemma?

1. T tubules
2. Sarcoplasmic reticula
3. Microtubules
4. Cisternae

✅ Correct Answer: 1

When the velocity of enzyme activity is plotted against substrate concentration, which of the following is obtained?

1. Straight line with negative slope
2. Straight line with positive slope
3. Parabola
4. Hyperbolic curve

✅ Correct Answer: 4

Which of the following catalyzes the reversible degradation of 2-phosphoglycerate to phosphoenolpyruvate?

1. Trypsin
2. Enolase
3. Chymotrypsin
4. Hexokinase

✅ Correct Answer: 2

Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism?

1. Bacterial dinitrogenase reductase
2. Phosphatase
3. Bacterial glutamine synthase
4. Bacterial dinitrogenase oxidase

✅ Correct Answer: 3

Which of the following is an example of epimers?

1. Mannose & Glucose
2. Glucose & Ribose
3. Galactose & Mannose
4. Glucose & Galactose

✅ Correct Answer: 4

In which of the following, glucose residues are linked by β1 &arr; 4 glycosidic bonds?

1. Starch
2. Cellulose
3. Glycogen
4. Amylose

✅ Correct Answer: 2