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2. 1. Proteins and complex carbs 2. Complex carbs and lipids 3. Lipids and proteins 4. Proteins and nucleic acids Countdown 30

3. 1. Ions 2. Small polar molecules 3. Gases 4. Large non-polar molecules Countdown 30

4. 1. Phospholipid bilayer 2. Channel proteins 3. Receptor proteins 4. Thin portions of the membrane Countdown 30

5. 1. The opposite of diffusion. 2. A synonym for diffusion. 3. The diffusion of water through a membrane. 4. Absorption of any substance. Countdown 30

6. 1. Hypertonic 2. Hypotonic 3. Isotonic when compared with the interior of the cell. Countdown 30

7. 1. Hypertonic 2. Hypotonic 3. Isotonic Countdown 30