Biophysical Chemistry – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. Biophysical chemistry is primarily concerned with: (A) Motion of planets (B) Physical principles applied to biological molecules (C) Geological processes (D) Electrical circuits 2. The study of molecular interactions and thermodynamics in biological systems falls under: (A) Biophysical chemistry (B) Pure mathematics (C) Astronomy (D) Metallurgy 3. The Gibbs free energy change (ΔG) for a spontaneous reaction is: (A) Positive (B) Negative (C) Zero (D) Infinite 4. The van’t Hoff equation relates: (A) Enzyme activity and temperature (B) Equilibrium constant and temperature (C) Pressure and volume (D) Wavelength and frequency 5. Entropy (ΔS) is a measure of: (A) Heat content (B) Disorder or randomness (C) Mass of a system (D) Molecular shape 6. The Boltzmann constant (kB) relates: (A) Energy and temperature at molecular scale (B) Force and acceleration (C) Mass and velocity (D) Pressure and radius 7. The Arrhenius equation describes the effect of: (A) pH on solubility (B) Temperature on reaction rate (C) Pressure on molarity (D) Radiation on molecules 8. A protein’s denaturation is often caused by: (A) Extreme temperature or pH (B) Normal physiological temperature (C) Equilibrium constants (D) Gibbs free energy increase 9. Calorimetry in biophysical chemistry measures: (A) Energy changes during biochemical reactions (B) Mass of proteins (C) Electrical resistance (D) DNA base pairing 10. Isothermal titration calorimetry (ITC) is used for: (A) DNA sequencing (B) Measuring biomolecular binding affinities (C) Protein crystallization (D) MRI imaging 11. Differential scanning calorimetry (DSC) measures: (A) Heat flow with temperature change (B) Radiation dose (C) Sound velocity (D) Mass defect 12. The Michaelis constant (Km) in enzyme kinetics represents: (A) Maximum velocity of enzyme (B) Substrate concentration at half Vmax (C) Enzyme turnover number (D) Heat capacity 13. Lineweaver–Burk plot is used in: (A) Protein folding (B) Enzyme kinetics analysis (C) DNA sequencing (D) Electrochemistry 14. Protein-ligand interactions can be studied by: (A) Spectroscopy and calorimetry (B) Astrology (C) Geophysics (D) Seismology 15. Fluorescence quenching is commonly used to study: (A) Binding interactions (B) Heat capacity (C) Radiation therapy (D) Electrical current 16. FRET is useful in: (A) Measuring distances between biomolecules (B) Radiation shielding (C) Thermodynamic cycles (D) Sound propagation 17. Chemical potential (μ) represents: (A) Energy per mole associated with particle number change (B) Radiation energy (C) Gravitational energy (D) Electric potential only 18. Osmotic pressure is directly proportional to: (A) Solute concentration (B) Temperature squared (C) Solvent polarity (D) Radiation dose 19. Raoult’s law relates: (A) Vapor pressure lowering to solute mole fraction (B) Heat flow to mass (C) Reaction rate to temperature (D) Volume to entropy 20. Colligative properties depend on: (A) Type of solute (B) Number of solute particles (C) Shape of molecules (D) Enzyme activity 21. Hydrogen bonds are important in: (A) Protein folding and DNA stability (B) Electrical resistance (C) Pressure-volume work (D) Nuclear fission 22. Hydrophobic interactions play a major role in: (A) Protein tertiary structure (B) Gas diffusion (C) Nuclear decay (D) Electrical conduction 23. Quantum mechanics is applied in biophysical chemistry to study: (A) Electron distribution in biomolecules (B) Thermodynamics of gases (C) Seismic waves (D) Sound in air 24. The Beer–Lambert law relates absorbance to: (A) Concentration and path length (B) Temperature and entropy (C) Pressure and volume (D) Wavelength and velocity 25. Absorbance spectra can be used to study: (A) Protein and nucleic acid concentration (B) Earth’s magnetic field (C) Seismic activity (D) Gas pressure 26. Circular dichroism spectroscopy is useful in: (A) Secondary structure determination of proteins (B) Measuring osmotic pressure (C) Chemical potential (D) Sound wave detection 27. Electrophoresis separates molecules based on: (A) Size and charge (B) Temperature (C) Pressure (D) Volume 28. The Nernst equation relates: (A) Electrode potential to ion concentration (B) Pressure to volume (C) Heat to entropy (D) DNA to RNA 29. In biological membranes, lipid bilayers form due to: (A) Hydrophobic effect (B) Ionic bonds (C) Covalent crosslinks (D) Crystallization 30. Ultracentrifugation separates biomolecules by: (A) Mass and shape (B) Electrical charge only (C) Heat flow (D) Radiation 31. Fluorescence anisotropy can measure: (A) Molecular rotation and binding events (B) DNA replication speed (C) Osmotic pressure (D) Crystal defects 32. Quantum yield in fluorescence is defined as: (A) Ratio of photons emitted to photons absorbed (B) Ratio of energy to mass (C) Heat to work (D) Velocity to frequency 33. In enzyme kinetics, turnover number (kcat) represents: (A) Number of substrate molecules converted per enzyme per unit time (B) Heat per mole (C) Binding affinity (D) Osmotic pressure 34. Free energy of binding is related to: (A) Equilibrium constant (B) Heat capacity (C) Pressure-volume work (D) Kinetic energy 35. Protein-ligand binding affinity is expressed as: (A) Dissociation constant (Kd) (B) Gibbs entropy (C) Van’t Hoff factor (D) Osmotic coefficient 36. In spectrophotometry, λmax refers to: (A) Wavelength of maximum absorbance (B) Pressure maximum (C) Voltage peak (D) Maximum entropy 37. Förster radius in FRET is defined as: (A) Distance at which energy transfer efficiency is 50% (B) Maximum absorbance wavelength (C) Radius of gyration (D) Crystal lattice spacing 38. pKa of an amino acid group indicates: (A) pH at which half of the group is ionized (B) Energy of activation (C) Melting temperature (D) Binding constant 39. Buffers resist changes in: (A) pH (B) Pressure (C) Temperature (D) Concentration 40. Henderson–Hasselbalch equation relates: (A) pH, pKa, and ratio of acid/base (B) Pressure and entropy (C) Free energy and volume (D) Wavelength and frequency 41. Electrophoretic mobility depends on: (A) Charge-to-mass ratio of a molecule (B) Heat capacity (C) Radiation dose (D) Solvent density only 42. The principle of chromatography relies on: (A) Differential partitioning between stationary and mobile phases (B) Electrical resistance (C) Heat transfer (D) Osmotic pressure 43. Fluorescence lifetime measurements provide: (A) Information on molecular environment and dynamics (B) Atomic weights (C) Osmotic pressure (D) Crystal lattice energy 44. Protein unfolding transitions can be monitored by: (A) DSC and CD spectroscopy (B) MRI (C) Electrocardiography (D) Osmotic pressure 45. A high Kd value indicates: (A) Weak binding affinity (B) Strong binding affinity (C) No binding (D) Covalent interaction 46. In enzyme kinetics, Vmax represents: (A) Maximum rate achieved by the enzyme (B) Heat capacity (C) Osmotic pressure (D) Turnover number 47. Diffusion of solutes across membranes follows: (A) Fick’s laws (B) Newton’s laws (C) Maxwell’s equations (D) Ohm’s law 48. The Debye–Hückel theory describes: (A) Ionic strength effects on activity coefficients (B) Gas compressibility (C) Enzyme kinetics (D) Protein folding 49. Surface plasmon resonance (SPR) is used for: (A) Real-time biomolecular interaction analysis (B) Gas pressure measurement (C) Heat flow (D) Crystal defects 50. Biophysical chemistry combines principles of: (A) Physics, chemistry, and biology (B) Astronomy and geology (C) Seismology and meteorology (D) Electronics and mechanics only Molecular Biophysics – MCQsCellular Biophysics – MCQsMembrane Biophysics – MCQsNeurobiophysics – MCQsRadiation Biophysics – MCQsMedical Biophysics – MCQsComputational Biophysics – MCQsStructural Biophysics – MCQsBiophysical Chemistry – MCQsBioenergetics – MCQsBiomechanics – MCQsSystems Biophysics – MCQsBiomolecular Interactions – MCQsBiophysical Methods & Instrumentation – MCQsQuantum Biophysics – MCQsThermodynamics & Statistical Mechanics in Biology – MCQsBiophysics of Macromolecules – MCQs Electrophysiology – MCQsPhotobiophysics – MCQsNanobiophysics – MCQs