The freezing of biotechnology products like vaccines require ............ freezing systems.
A
Helium
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B
Nitrogen
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C
Ammonia
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D
Chlorine
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Solution
The correct option is B Nitrogen Liquid nitrogen provides the temperature of -196o C. Nitrogen is commonly used for freezing and storage of certain tissue, cells, embryo, cultures, vaccines and other biological products in freezing systems. The low temperature prevents degradation of the materials.