Whereas bacteria only have a single chromosome, eukaryotic species have at least one pair of chromosomes. Most have more than one pair. Another relevant point is that eukaryotic chromosomes are detected only occur during cell division and not during all stages of the cell cycle.
How does it work? In very basic terms, your absorption RV refrigerator works like this. It uses heat, and a combination of ammonia, hydrogen gas, and water. These chemicals react and go through various tubes, and the evaporation and condensation process of these chemicals are what cools the refrigerator. These are basic laws of physics.
How Temperature Controls Work. Many people mistakenly believe that the two adjustment dials found within the fridge are set up to control refrigerator and freezer temperatures independently. While this is true of some high-end models, it's not true for most standard refrigerators. In fact, all the cold air generated in the average unit is produced within the fridge. One of the dials on the fridge is responsible for directing the unit to create more or less cold air. The other simply operates a baffle to control how much cold air from the freezer is released into the fridge.