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GATE 2019 BT – Question 12

Plant, Animal and Microbial Biotechnology · Animals: Culture media and growth conditions, preservation, anchorage dependent and independent culture, growth kinetics, carrier culture · 1 mark · Multiple choice

Which is used as a pH indicator in animal-cell culture medium?

  1. Acridine orange
  2. Phenol red
  3. Bromophenol blue
  4. Coomassie blue

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Correct answer: (B) Phenol red

Explanation

Phenol red changes colour over the pH range useful for monitoring many animal-cell culture media and indicates acidification or alkalinization. Thus B. Acridine orange is principally a fluorescent nucleic-acid stain, Coomassie blue a protein stain, and bromophenol blue commonly a tracking dye.

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