Transformation is the process in which unicellular organisms that protect themselves from extinction. A unicellular organism takes in DNA from outside and tries it on for size.
NO NYCgirl_1 edit: Unicellular organisms reproduce asexually but creating an exact replica of their nucleus and split in half. A very famous example of this is Ameobas. They split directly down the middle creating a clone of themselves, and therefore reproducing asexually
Budding is one method unicellular organisms use to reproduce. Essentially, a daughter organism begins to grow attached to the parent and eventually separates. Both parent and daughter have identical DNA. Yeasts use this method.
Well you see unicellular organisms are very unique in the fact that they live all on their own and move around with a flagellum or little motor, but to the point unicellular organisms carry out esscentally every function in life and they must in order to simply survive. One function is reproduction and they reproduce asexually
unicellular
Sexual reproduction allows for organisms to reproduce and pass on their traits.
transformation
phagocytosis is the process of aquiring nutrition in unicellular organisms
Mitosis
NO NYCgirl_1 edit: Unicellular organisms reproduce asexually but creating an exact replica of their nucleus and split in half. A very famous example of this is Ameobas. They split directly down the middle creating a clone of themselves, and therefore reproducing asexually
Extinction, maybe?
There will be two unicellular organisms and the cycle continues.
The first life on earth was unicellular organisms. These organisms reproduced asexually, meaning that they reproduced by copying themselves. Because they did not interbreed, a slight mutation in the DNA caused a new species to exist. If one of the mutant cells failed to divide, that was a species becoming extinct. Humans cannot even begin to fathom the number of these species there must have been or when they started to become extinct. Extinction is a natural process and cannot be stopped; when we talk about being concerned about extinction we generally mean extinctions caused by modifications made to the environment by humans.
The process of drinking by unicellular organisms is called pinocytosis. Cells take in drops of liquid outside the cell. They take in meager drops of extra-cellular fluids.
reproduction
They go through a process called mitosis in which they make copies of their DNA and then divide into two separate organisms. And this just keeps repeating.
Budding is one method unicellular organisms use to reproduce. Essentially, a daughter organism begins to grow attached to the parent and eventually separates. Both parent and daughter have identical DNA. Yeasts use this method.
If they're not using their cell, I'm not sure what else they would be using. There's only one cell to be used. If you're asking whether there is a "breathing mechanism" within the cell, then the answer is no. Unicellular organisms don't need an extensive respiratory system like multicellular organisms. Moreover, unicellular organisms couldn't "breathe" because no organelle supports such a thing. Instead, unicellular organisms get oxygen just through diffusion. Because unicellular organisms are small, the diffusion of oxygen into the cell is sufficient for cell respiration. In contrast, larger multicellular organisms can't obtain oxygen through diffusion alone because the oxygen couldn't "get" to every cell.