Final answer:
When working with bacterial stock cultures in the lab, it is important to disinfect the work area, sterilize equipment and supplies, and properly discard the cultures.
Step-by-step explanation:
When dealing with bacterial stock cultures in the lab, certain precautions and procedures need to be followed. Firstly, prior to working with the cultures, it is important to disinfect the work area both before and after working with them. Secondly, all equipment and supplies used in experiments with bacterial cultures should be sterilized. Finally, when the cultures are no longer needed, they should be discarded properly, either by throwing them away in a garbage container marked with a biohazard sign or by allowing the agar to dehydrate in the incubator and then disposing of it.