 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?

 Answers to bellringer 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

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

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

 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

 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

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

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