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Which of the following is best used for long term storage of microbial samples when carried out properly? | |
A. | Storage in a freezer at -10°C [Wrong Answer] |
B. | Storage in a freezer at ultra low temperatures (-70°C) [Correct Answer] |
C. | Storage in a refrigerator on an agar slant [Wrong Answer] |
D. | Storage on a petri plate at room temperature [Wrong Answer] |