Do Now….. Review for your Test Can you label the photosynthesis and cellular respiration diagrams???? Any questions????

A Cell’s role in creating an organism

Uni-cellular organism Organism is composed of a singe cell Single cell performs all life functions Examples: yeast, bacteria

Multicellular Organisms Organism composed of more than one cell Examples: plants, animals Cells develop special jobs and group together in an organized way . . .

Mutlicellular Organism Levels of organization 1) cells --> 2) tissues --> 3) organs --> 4) organ systems --> 5) organisms

1) Cells Are the basic unit of structure and function in living things Examples- blood cells, nerve cells, bone cells, etc

2) Tissues Made up of groups of similar cells that perform a particular function Examples— connective, epithelial, muscle, and nerve

3) Organs Made up of tissues that work together to perform a specific activity Examples - heart, brain, skin, etc.

4) Organ systems Groups of two or more organs that work together to perform a specific function for the organism. --Examples - digestive system, nervous system, skeletal system, etc.

5) Organism Entire living thing that can carry out all basic life processes

Essential Question How do organisms get to be MULTI-cellular?

Cell growth and Division Why can’t cells get infinitely large? Because the info stored in DNA can only meet the needs of a limited sized cell . . . Too big of a cell leads to an “information crisis” library example

Why can’t cells get infinitely large? 2. Because a cell that is too big can not efficiently have nutrients delivered and wastes removed Stadium example