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.
If the temperature goes lower, the food inside the refrigerator will freeze and ruin. The refrigerator will not work well in an unheated garage. There is no kit for your refrigerator to make it work in an unheated garage. You can buy refrigerators that will operate inside an unheated garage. Whirlpool makes a refrigerator called the Gladiator that will operate inside an unheated garage. Sears sells the Gladiator refrigerator.