 Cells PowerPoint By Chet Krajewski

 The Cell Theory The Cell Theory has 3 parts: All Living Organisms are Composed of Cells Cells are the Basic Units of Life Cells Come from other Cells

 Cell Shape and Cell Function Cells are longer and tighter to form a solid or stronger tissue. Cells are strung out and loose to form structures like blood.

 Factors That Limit Cell Size Cell surface area determines how well the cell will function. If cells get to big in areas where there is no room for large cells, the cells will move slower and won’t do their job as well.

 Prokaryote and Eukaryote Cells

Prokaryotic Cells  Prokaryotic Cells are cells without a nucleus. DNA is in the cytoplasm instead of the Nucleus. These cells are found in single-celled organisms, usually bacteria. Prokaryotic Organisms or called prokaryotes. Prokaryotes were the first organisms to evolve and are still the most common organisms today.

Eukaryotic Cells  Eukaryotic Cells have a nucleus. DNA is in the nucleus in Eukaryotic Cells. Multi-cellular organisms have Eukaryotic Cells in them. Organisms with these cells are called Eukaryotes. Eukaryotic Cells contain organelles. Organelles are structures within a cytoplasm that performs a specific job. For example the mitochondria provides energy to the cell.

 Levels of Cell Organization 1. Cells 2. Tissues 3. Organ 4. Organ System 5. Organism

Cell Organization  Cells are the basic structure for organisms. They can do specific functions. Tissues are made up of similar cells that work together. Organs are made up of tissues. Organs perform specific activities. Organ Systems are two or more tissues that work together to perform a function. Organisms are all of the cells working together to allow for a living life.

Citations  CK 12 Biology Lesson 3.1: Critical Reading.  ls/sciber/levelorg.htm ls/sciber/levelorg.htm