Cell Biology - Questions and Answers for Competitive Exams | GkSeries

37. A substance that forms an insoluble complex with stain and serves to fix the color to bacterial cell is called as ________.

• [A] mordant
• [B] intensifier
• [C] fixative
• [D] dyes

Answer: Option [A]

38. A stain which on ionization gives positively charged molecules is referred as ________.

• [A] acidic stain
• [B] Basic stain
• [C] anionic stain
• [D] basic mordant

Answer: Option [A]

39. The charged group of bacterial cell surface produces attraction between basic stain ________.

• [A] negative
• [B] positive
• [C] neutral
• [D] all of the above

Answer: Option [B]

40. The differential staining technique refers as ________ staining.

• [A] monochrome
• [B] Gram
• [C] negative
• [D] endospore

Answer: Option [B]

41. The Petroff-Hausser counting chamber consist of ________.

• [A] 25 squares
• [B] 100 squares
• [C] 50 squares
• [D] none of the above

Answer: Option [A]

42. The process that reduces the bacterial count to safe levels as may judged by the public health is referred as ________.

• [A] sterilization
• [B] sanitization
• [C] disinfection
• [D] antisepsis

Answer: Option [B]

43. Slide culture technique is used for ________ cultivation

• [A] bacterial
• [B] fungi
• [C] virus
• [D] algae

Answer: Option [B]

44. Maintenance of sterile condition is referred as ________.

• [A] aseptic technique
• [B] septic technique
• [C] disinfection
• [D] fumigation

Answer: Option [A]

45. ___________ is referred as biological indicator of autoclave.

• [A] Bacillus stearothermophilus
• [B] Bacillus subtilis
• [C] Bacillus megatorium
• [D] Bacillus cereus

Answer: Option [A]

46. Colorimeter is applied only in relation to _______.

• [A] uv light
• [B] X rays
• [C] visible light
• [D] IR rays

Answer: Option [A]

47. Separation of small molecule can be done by ______

• [A] viscometer
• [B] centrifugation
• [C] flow cytometry
• [D] spectrophotometer

Answer: Option [B]

48. The pH meter standardized with pH ________

• [A] 7
• [B] 8
• [C] 14
• [D] 4

Answer: Option [A]