2. Membrane Transport Passive transport doesn’t require cell input of energy (ATP)

3. Active Transport Molecules transport from lower to higher transportation with the use of cellular energy (uses ATP) Special proteins transport molecules help transport

4. How can you determine which is passive or active transport? Diffusion may use special proteins moves from high to low

5. Receptor molecules are important for cell communication The receptors are specific in shape and to the individual organism Receptor

6. Large and Small Organic Molecules Small molecular units that are the building block of a larger molecules Polymer: long chain of small molecular units (monomers) Living things must both synthesize (build) large molecules and break them down. Can you think of examples when this is done?