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.
Refrigerators work to remove moisture that is naturally present in the air inside of the unit. If there is too much moisture (condensation) present for the refrigerator to remove, the moisture will build up on the interior of the refrigerator. Moisture (in the form of frost or ice) can also build up in the freezer compartment.