Biophysics MCQ

Q1. What is the primary focus of biophysics?

Correct Answer: B

Biophysics applies physical principles to biological systems.

Q2. In biophysics, DNA stands for:

Correct Answer: B

DNA is Deoxyribonucleic Acid.

Q3. What is the unit of force commonly used in biophysics?

Correct Answer: A

Force is measured in Newtons.

Q4. The term "diffusion" is best described as:

Correct Answer: C

Diffusion is movement from high to low concentration.

Q5. A protein molecule like albumin can freely diffuse through a biological membrane:

Correct Answer: B

Large molecules like albumin cannot diffuse freely.

Q6. Which of the following is NOT an example of facilitated transport?

Correct Answer: D

Passive diffusion is not facilitated transport.

Q7. Simple diffusion across a biological membrane requires:

Correct Answer: C

Simple diffusion is energy-independent.

Q8. Which ions can easily pass through the biological membrane?

Correct Answer: B

Water molecules can cross easily.

Q9. Valinomycin facilitates diffusion of:

Correct Answer: B

Valinomycin is a K+ ionophore.

Q10. Which process is fastest among these?

Correct Answer: C

Active transport is fastest.

Q11. Which process does NOT require a carrier molecule?

Correct Answer: B

Simple diffusion is carrier-independent.

Q12. According to Fick’s law, diffusion rate is:

Correct Answer: A

Diffusion depends on concentration gradient.

Q13. The pH of gastric juice of infants is approximately:

Correct Answer: B

Infant gastric pH is around 2.5.

Q14. The pH of blood is approximately:

Correct Answer: B

Blood pH is maintained at ~7.4.

Q15. Which radioactive isotope is used to determine thyroid function?

Correct Answer: B

Iodine-131 is used.

Q16. The protein biosynthesis process can be studied using:

Correct Answer: D

Various methods study protein biosynthesis.

Q17. What is the main function of the plasma membrane?

Correct Answer: B

Membrane regulates transport.

Q18. The term β€œosmosis” is:

Correct Answer: A

Osmosis: water flow to higher solute.

Q19. The term β€œelectrophoresis” refers to:

Correct Answer: A

Electrophoresis separates molecules by charge.

Q20. NMR spectroscopy is used to study:

Correct Answer: A

NMR reveals molecular structures.

Q21. Which electron microscopy technique offers 3D surface imaging?

Correct Answer: B

SEM provides 3D surface images.

Q22. Radioimmunoassay is used to measure:

Correct Answer: A

RIA measures hormones quantitatively.

Q23. Which biological macromolecule is primarily studied in biophysics?

Correct Answer: C

Protein structure and function are key focus.

Q24. Which law governs diffusion?

Correct Answer: C

Fick’s law describes diffusion processes.

Q25. Which property distinguishes living matter in biophysics?

Correct Answer: B

Living matter is complex and organized.

Q26. Which biophysical method measures atomic environment?

Correct Answer: A

NMR studies atomic environments in molecules.

Q27. Which type of microscopy is widely used to study biomolecules?

Correct Answer: B

Electron microscopy provides high resolution.

Q28. Fluorescence spectroscopy studies:

Correct Answer: A

Fluorescence is emission after excitation.

Q29. Which forces contribute significantly in protein folding?

Correct Answer: D

All listed forces are important.

Q30. Biophysical modeling helps in:

Correct Answer: A

Modeling assists understanding molecular functions.

Q31. The refractive index of water is approximately:

Correct Answer: B

Water has refractive index ~1.33.

Q32. The principle of X-ray crystallography is based on:

Correct Answer: B

X-rays diffract to reveal atomic structure.

Q33. Which property can be studied by circular dichroism spectroscopy?

Correct Answer: A

CD gives info on protein conformation.

Q34. Diffusion constant depends on:

Correct Answer: D

All listed factors affect diffusion.

Q35. Electron spin resonance (ESR) is used for:

Correct Answer: A

ESR detects free radicals.

Q36. Which device measures light absorption?

Correct Answer: A

Spectrophotometer measures absorbance.

Q37. The phenomenon of resonance energy transfer is significant in:

Correct Answer: A

Used to study interactions between proteins.

Q38. In biophysics, Raman spectroscopy is used for:

Correct Answer: B

Raman analyses molecular vibrations.

Q39. Which method analyzes protein-protein interactions?

Correct Answer: B

FRET probes proximity of proteins.

Q40. Biophysics integrates which disciplines?

Correct Answer: A

Biophysics blends physics with biology.

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