Biophysics - Questions and Answers for Competitive Exams | GkSeries

49. What is the proportion of glycine residues in collagenous regions

• [A] One-fourth
• [B] One-third
• [C] Half
• [D] One-tenth

Answer: Option [B]

50. Which of the three subunits of the G proteins binds GDP and GTP

• [A] Alpha
• [B] Beta
• [C] Gamma
• [D] Delta

Answer: Option [A]

51. O2 binding to hemoglobin results in

• [A] 100-fold higher affinity for the last O2 bound than for the first
• [B] extensive protein conformational change
• [C] both (A) and (B)
• [D] 100-fold lower affinity for the last O2 bound than for the first

Answer: Option [C]

52. Sulphydryl oxidase is used for

• [A] discoloration
• [B] clarification of images
• [C] UHT milk off flavour removal
• [D] all of these

Answer: Option [C]

53. A mixed fermentation is one, which produces

• [A] both alcohol and carbon dioxide
• [B] both acid and carbon dioxide
• [C] both acid and alcohol
• [D] several different kinds of acid

Answer: Option [C]

54. Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have

• [A] low molecular weight
• [B] high molecular weight
• [C] high equivalent weigh
• [D] low reactivity

Answer: Option [A]

55. A fluid in which the viscosity decreases with increasing stirrer speed and mixing time, can be represented as

• [A] newtonian fluid
• [B] pseudoplastic, thixotropic fluid
• [C] dilatant, rheopectic fluid
• [D] dilatant, pseudoplastic fluid

Answer: Option [B]

56. In animal cell bioreactor, bubble damage can be minimized by

• [A] the addition of a shear protectorant
• [B] using a bubble free oxygen delivery system
• [C] headspace aeration
• [D] all of the above

Answer: Option [D]

57. The torque required to move an impeller at a set speed

• [A] newtonian fluid
• [B] pseudoplastic
• [C] dilatant
• [D] rheopectic

Answer: Option [A]

58. Water insoluble enzymes can be prepared by using multifunctional agents that are bifunctional in nature and have

• [A] low molecular weight
• [B] high molecular weight
• [C] high equivalent weight
• [D] low reactivity

Answer: Option [A]

59. For glucose isomerization by immobilized enzyme, the reactor generally used is

• [A] CSTR
• [B] plug flow
• [C] packed bed
• [D] fluidized bed

Answer: Option [C]

60. Which of the following is an example of tertiary structure in a protein

• [A] A multimeric protein
• [B] An a-helix
• [C] A P-pleated sheet
• [D] A globular domain

Answer: Option [A]