Enzyme production is central to pharmaceutical biotechnology; this set focuses on Production of Amylase, Catalase, Peroxidase, Lipase, Protease, Penicillinase MCQs to build practical competence for B. Pharm students. You will review microbial sources, fermentation strategies, optimization parameters (pH, temperature, aeration), downstream purification, immobilization, and stability considerations. Topics also include enzyme assays, activity units, kinetics (Km/Vmax), inhibitors, industrial and therapeutic applications, and genetic expression systems used for overproduction. Emphasis is placed on analytical methods, quality control and regulatory aspects relevant to enzyme-containing formulations. Clear conceptual understanding will aid formulation, process design and troubleshooting in industrial settings. Now let’s test your knowledge with 30 MCQs on this topic.
Q1. Which assay is commonly used to measure amylase activity by quantifying reducing sugars?
- Dinitrosalicylic acid (DNS) method
- Bradford assay
- Lowry method
- Kjeldahl assay
Correct Answer: Dinitrosalicylic acid (DNS) method
Q2. Which microorganism is a classical industrial producer of extracellular amylase?
- Escherichia coli
- Bacillus subtilis
- Saccharomyces cerevisiae
- Aspergillus niger
Correct Answer: Bacillus subtilis
Q3. Catalase activity is typically assayed by measuring the rate of:
- Glucose oxidation
- H2O2 decomposition to O2
- Protein hydrolysis
- Lipid emulsification
Correct Answer: H2O2 decomposition to O2
Q4. Which factor most strongly affects enzyme stability during downstream processing?
- Ambient light intensity
- pH and temperature
- Color of reaction vessel
- Operator height
Correct Answer: pH and temperature
Q5. A typical unit definition for enzyme activity (U) is:
- Amount of enzyme required to hydrolyze 1 g substrate per hour
- Amount of enzyme that catalyzes the conversion of 1 μmol substrate per minute
- Amount of enzyme in 1 mL of culture
- Mass of enzyme that weighs 1 μg
Correct Answer: Amount of enzyme that catalyzes the conversion of 1 μmol substrate per minute
Q6. Which downstream step is commonly used first to concentrate extracellular enzymes from fermentation broth?
- Gel filtration chromatography
- Ammonium sulfate precipitation
- Affinity chromatography
- Isoelectric focusing
Correct Answer: Ammonium sulfate precipitation
Q7. Peroxidase commonly uses which co-substrate in its typical assay with guaiacol?
- NADH
- Hydrogen peroxide
- ATP
- Oxygen only
Correct Answer: Hydrogen peroxide
Q8. Which ion often stabilizes alpha-amylase structure and activity?
- Mg2+
- Ca2+
- Fe3+
- Cu2+
Correct Answer: Ca2+
Q9. Protease activity can be measured using casein as substrate; the assay detects:
- Released amino acids / peptides
- Decrease in viscosity only
- CO2 evolution
- Substrate precipitation
Correct Answer: Released amino acids / peptides
Q10. Lipase specifically catalyzes:
- Peptide bond hydrolysis
- Hydrolysis of triglycerides to free fatty acids and glycerol
- Cellulose cleavage
- Phosphate transfer reactions
Correct Answer: Hydrolysis of triglycerides to free fatty acids and glycerol
Q11. Penicillinase (beta-lactamase) confers resistance by:
- Inhibiting ribosomes
- Hydrolyzing the beta-lactam ring of penicillins
- Blocking DNA replication
- Altering cell membrane permeability
Correct Answer: Hydrolyzing the beta-lactam ring of penicillins
Q12. Immobilization of enzymes is advantageous because it:
- Always increases enzyme Km
- Allows enzyme reuse and improves operational stability
- Makes the enzyme completely immune to inhibitors
- Eliminates the need for buffers
Correct Answer: Allows enzyme reuse and improves operational stability
Q13. Which chromatographic method exploits specific binding between enzyme and ligand for purification?
- Ion-exchange chromatography
- Affinity chromatography
- Size-exclusion chromatography
- Hydrophobic interaction chromatography
Correct Answer: Affinity chromatography
Q14. A decrease in Vmax with no change in Km in presence of an inhibitor indicates:
- Competitive inhibition
- Noncompetitive inhibition
- Uncompetitive inhibition
- Substrate depletion
Correct Answer: Noncompetitive inhibition
Q15. Zymography is used to analyze:
- Enzyme molecular weight and activity simultaneously
- Only DNA purity
- Lipid composition of membranes
- Buffer ionic strength
Correct Answer: Enzyme molecular weight and activity simultaneously
Q16. Which fermentation mode is typically most suitable for continuous high-volume enzyme production?
- Batch fermentation
- Fed-batch fermentation
- Continuous (chemostat) fermentation
- Solid-state fermentation only
Correct Answer: Continuous (chemostat) fermentation
Q17. Which protease inhibitor specifically targets serine proteases?
- PMSF (phenylmethylsulfonyl fluoride)
- EDTA
- β-Mercaptoethanol
- Dicoumarol
Correct Answer: PMSF (phenylmethylsulfonyl fluoride)
Q18. Immobilized enzyme reactors commonly use which support property to minimize enzyme leaching?
- High solubility of support
- Covalent binding to support
- Very small pore size incompatible with substrate
- Neutral pH materials only
Correct Answer: Covalent binding to support
Q19. In production of industrial amylase, solid-state fermentation (SSF) is often preferred for:
- Liquid product formation only
- Processing on inert carrier with low moisture and cost-effectiveness
- High shear mixing requirements
- Production of oxygen-sensitive vitamins
Correct Answer: Processing on inert carrier with low moisture and cost-effectiveness
Q20. Specific activity of an enzyme preparation is defined as:
- Total protein mass per liter
- Enzyme activity per mg of total protein
- Total activity per mL of buffer
- Ratio of Km to Vmax
Correct Answer: Enzyme activity per mg of total protein
Q21. Which reagent is commonly used to detect liberated fatty acids in a lipase assay titrimetrically?
- Sodium hydroxide titration
- Dinitrosalicylic acid
- Biuret reagent
- Folin–Ciocalteu reagent
Correct Answer: Sodium hydroxide titration
Q22. Peroxidase enzymes are widely used in pharmaceutical analysis because they:
- Act as strong reducing agents only
- Can couple oxidation of substrates to colorimetric detection
- Hydrolyze proteins rapidly
- Are unaffected by H2O2 concentration
Correct Answer: Can couple oxidation of substrates to colorimetric detection
Q23. Recombinant expression of a bacterial enzyme in E. coli often requires which element for secreted extracellular enzyme production?
- Endogenous yeast signal peptide
- Bacterial signal peptide for secretion pathway
- Heavy metals in media
- Glucose-free medium only
Correct Answer: Bacterial signal peptide for secretion pathway
Q24. Amylase hydrolyzes which bond in starch?
- Peptide bonds
- α-1,4-glycosidic bonds
- β-1,4-glycosidic bonds only
- Phosphodiester bonds
Correct Answer: α-1,4-glycosidic bonds
Q25. An increase in enzyme specific activity after purification indicates:
- Successful removal of non-enzymatic proteins
- Loss of enzyme purity
- Increased total protein concentration
- Contamination with nucleic acids
Correct Answer: Successful removal of non-enzymatic proteins
Q26. Which method is most appropriate to determine kinetic parameters Km and Vmax?
- Spectral scanning only
- Michaelis–Menten curve fitting using varying substrate concentrations
- Single substrate concentration measurement
- Qualitative spot test
Correct Answer: Michaelis–Menten curve fitting using varying substrate concentrations
Q27. Penicillinase genes are frequently located on:
- Mitochondrial DNA
- Plasmids in bacteria
- Human chromosomes
- Ribosomal RNA genes
Correct Answer: Plasmids in bacteria
Q28. Which property is most critical when choosing a buffer for enzyme activity assays?
- Buffer color
- Appropriate pH and buffering capacity at assay temperature
- High ionic detergents
- Buffer crystallization point
Correct Answer: Appropriate pH and buffering capacity at assay temperature
Q29. A protease used in detergent formulations must typically be:
- Active only at pH 3
- Stable and active at alkaline pH and elevated temperatures
- Susceptible to oxidizing agents
- Ineffective on protein stains
Correct Answer: Stable and active at alkaline pH and elevated temperatures
Q30. In enzyme purification, fold purification is calculated by dividing:
- Total activity by final volume
- Specific activity after purification by specific activity of crude extract
- Total protein by total activity
- Yield percentage by initial protein
Correct Answer: Specific activity after purification by specific activity of crude extract
