Question

Choose the correct answer from the four alternatives given in the brackets.
The freezing of biotechnology products like vaccines requires ........... freezing system.
(Helium, Nitrogen, Ammonia, Chlorine)

Answer 1

The answer is nitrogen. Liquid nitrogen provides the temperature of -196${}^o$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.