1. Cells Section 1 – Cell Structure A. Common cell structures – outer covering called cell membrane and internal gelatin like cytoplasm. A. Comparing cells – size and shape relate to function B. Two cell types A. Prokaryotic cells lack membrane – bound internal structures A. Only found in one-celled organisms such as bacteria B. Eukaryotic cells contain membrane – bound internal structures.

2. Cell organization B. Cell organization A. Composes of cellulose, a cell wall grows, gives shape to, and protects the cells of plants, algae, fungi, and most bacteria. B. Cell membrane – protective layer around the cells A. For cells with cell walls, the cell membrane is inside the cell wall. B. A cell membrane allows food and oxygen into the cell and waste products out of the cell

4. Cytoplasm – gelatin like substance inside cell membrane Cytoplasm – gelatin like substance inside cell membrane Cytoskeleton – scaffolding – like structure in cytoplasm which helps cell keep its shape Cytoskeleton – scaffolding – like structure in cytoplasm which helps cell keep its shape In the cytoplasm, eukaryotic cells have organelles which help cell life processes. In the cytoplasm, eukaryotic cells have organelles which help cell life processes. Nucleus – contains instructions for everything cell does; includes DNA Nucleus – contains instructions for everything cell does; includes DNA