Which one of the following is used for storing biological tissues?
- A.Liquid nitrogen
- B.Liquid helium
- C.Liquid argon
- D.Liquid bromine
Show answer
It is very cold, chemically inert and cheap, which makes it the standard coolant for preserving cells and tissues. Liquid nitrogen boils at about −196 °C. At such low temperatures the chemical and enzyme activity inside cells almost stops, so tissues can be kept unchanged for years.
Read the full explanation →