Biophysics - Questions and Answers for Competitive Exams | GkSeries

37. In reversed phase HPLC, there is a

• [A] non polar solvent and polar column
• [B] polar solvent and non-polar column
• [C] non polar solvent and non-polar column
• [D] all the above

Answer: Option [B]

38. In gas chromatography, the basis for separation of the components of the volatile material is the difference in

• [A] partition coefficients
• [B] conductivity
• [C] molecular weight
• [D] molarity

Answer: Option [A]

39. Ion exchange chromatography is based on the

• [A] electrical mobility of ionic species
• [B] adsorption chromatography
• [C] electrostatic attraction
• [D] partition chromatography

Answer: Option [C]

40. Molar absorbtivities of compounds exhibiting charge transfer absorption are

• [A] small
• [B] moderate
• [C] large
• [D] depends on compounds

Answer: Option [C]

41. Which of the following will oscillate the fastest

• [A] A large mass on a weak spring
• [B] A large mass on a stiff spring
• [C] A small mass on a stiff spring
• [D] A small mass on a weak spring

Answer: Option [C]

42. Which of the following components of a monochromator is the dispersing element

• [A] The collimating lens
• [B] The entrance slit
• [C] The diffraction grating
• [D] Convex lens

Answer: Option [C]

43. Which of the following is the basis of first dimension of separation for two-dimensional electrophoresis

• [A] Molecular mass
• [B] Solubility
• [C] Isoelectric point
• [D] Folding

Answer: Option [C]

44. An FT-IR instrument record a signal in the

• [A] frequency domain
• [B] size domain
• [C] time domain
• [D] core domain

Answer: Option [C]

45. What is used to cool the superconducting coil

• [A] Hydrogen
• [B] Ice
• [C] Dry ice
• [D] Liquid helium

Answer: Option [D]

46. All hydrogen atoms

• [A] have the same resonance frequency
• [B] resonate at different frequencies depending on their environment
• [C] are attached to carbon
• [D] resonate at about the same frequency as carbon

Answer: Option [B]

47. Hydrogen bonds in a-helices are

• [A] more numerous than Vander Waals interactions
• [B] not present at Phe residues
• [C] analogous to the steps in a spiral staircase
• [D] roughly parallel to the helix axis

Answer: Option [D]

48. What is the effect of a decrease in pH on hemoglobin oxygen affinity

• [A] Decrease in oxygen affinity
• [B] Increase in oxygen affinity
• [C] No effect on oxygen affinity
• [D] Increase affinity in muscle cell otherwise decrease

Answer: Option [A]