1.  Bellringer 12/7/15 1. What is the smallest unit that can perform all the processes necessary for life? 2. A group of cells with the same function makes up a __________. 3. What are the four levels of organization?

2.  Answers to bellringer.... 1. A cell is the smallest unit that can perform all life processes. 2. A group of cells with the same function makes up a tissue. 3. The four levels of organization of living things are cell tissue organ organ system

3. Cellular processes…. Diffusion  the movement of particles from regions of higher density to regions of lower density Osmosis  the diffusion of water through a semipermeable membrane

4. Cellular processes continued… endocytosis  process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell  INSIDE exocytosis  process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane  OUTSIDE

5.  Four levels of organization  cell - the smallest unit that can carry out life processes  tissue - group of similar cells that perform a common function  organ - collection of tissues that carry out a specialized function of the body  organ system - group of organs that work together to perform body functions

6.  Chromosome - one of the structures in the nucleus that are made up of DNA and protein  Mitosis - process of cell division that forms two new nuclei  Cell Cycle - the life cycle of a cell

7. Mitosis and the Cell Cycle Cytokinesis - division of the cytoplasm of a cell

8.  How does mitosis ensure that a new cell is just like its parent cell?  HOMEWORK: (answers only) Due 12/9/15  pages 70-71 #s 1-17 & 23-25  pages 92-93 #s 3-14 & #s 19-21