1. Cells

2. Vocabulary Cells – building blocks of life. Tissues – a group of cells that work together as a team. Organs – a group of tissues working together to perform a specific job Organ system – a group of organs that work together to perform particular jobs. An example is the digestive system.

3. Vocabulary  Organism – anything that can live on its own.  Unicellular – single cell living on its own.  Multi-cellular – group of cells that can only exist when they are together.

4. Vocabulary  Population – a group of organisms that are of the same kind and that live in the same area.  Communities – 2 or more different populations that live in the same area.  Ecosystems – the community and all non- living that affect it, such as water, soil, rocks, temperature, and light.

5. Vocabulary  Cell membrane – acts as a barrier between inside of the cell and the cell’s environment. It also controls the passage of materials into and out of the cell.  Organelles – chemicals and structures that enable the cell to live, grow and reproduce.  Cytoplasm – cellular fluid surrounding a cell’s organelles.  Nucleus – the membrane covered organelle found in eukaryotic cells; contains the DNA and serves as a control center for the cell.

6. Eukaryotic vs. Prokaryotic cells  Eukaryotic – a cells contains a nucleus and a complicated internal structure.  Has a nucleus  Membrane-covered organelles  Linear DNA  Complex cell  All other cells  Prokaryotic – world smallest cells and they do not have a nucleus. DNA is one long, circular molecule shaped like rubber band.  No nucleus  No membrane –covered organelles  Circular DNA  Simple cell  Bacteria