Cells

Cells. Cells are the smallest unit that can perform all all the processes necessary for life. There are two main cell types eukaryotes and prokaryotes they are both very different. Eukaryotic cells are the largest type of cell and many parts that keeps the cell alive. Prokaryotic cells are single celled organisms that do not have a nucleus or membrane bound organelles. There are three parts to the cell theory.”All organisms are made of one or more cells. The cell is the basic unit of all living things. All cells come from existing cells. The cell membrane is a protective layer that covers the cells surface and acts as a barrier. It separates the contents of the cell from its environment. All cells have organelles that carry out various life processes. Organelles are structures that perform specific functions within the cell. All cells contain DNA at some point in their life. In some cells, the DNA is enclosed inside an organelle called the nucleus. You are a multicultural organism. That means you are made of many small cells. A tissue is a group of cells that work together to perform a specific job. A structure  that is made up of two or more tissues working together to perform a specific function is called an organ. A group of organs working together to perform a particular function is called an organ system. Anything that can perform a function by itself is called an organism. Structure is the arrangement of the parts in an organism. Function is the job the part does.