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GATE 2020 BT – Question 23

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 medium component is used to maintain pH in mammalian cell culture?

  1. $CaCl_2$
  2. $MgSO_4$
  3. $NaCl$
  4. $NaHCO_3$

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Correct answer: (D) $NaHCO_3$

Explanation

Sodium bicarbonate participates in the $CO_2/HCO_3^-$ buffer system. With a controlled carbon-dioxide atmosphere it helps stabilize culture-medium pH. Calcium chloride and magnesium sulfate provide ions, and sodium chloride supports ionic strength and osmotic balance; none is the listed bicarbonate buffer. Select D.

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