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.
Before you use your refrigerator for the first time place a small bubble level on a refrigerator shelf. Adjust the the level of your RV until the refrigerator is level. Then find a countertop or some other place on the RV that also reads level. This will be your reference from now on. If you keep the level in the frig and you open the door several times to check for level the refrigerator can take an hour or more to recover. Here's some tips for getting the most from your RV refrigerator. Pre-cool the refrigerator for several hours before use. Put only cold things in the refrigerator... buy cold sodas and beer or pre-cool them in your home refrigerator. Keep the refrigerator well stocked with items that hold the cold well.