Cell Transport Intro Questions Directions: Using your book, answer the following questions. 1. If a substance is able to move across a membrane, the membrane is said to be _______________. 2. ____________________________ moves substances within the cell and moves substances out of the cell. 3. Substances moving constantly in random motion is _________________________. 4. What is diffusion? ___________________________________________________________________ 5. In which direction does diffusion occur? _________ to __________ 6. What supplies the energy for diffusion? __________________________________ 7. Molecules are constantly _____________________. 8. When the concentrations are the same throughout, the system has reached _________________________. 9. What 3 factors affect the rate of diffusion? ______________, ____________, & ______________. 10. ___________ can diffuse across the plasma membrane but most other substances ____________. 11. What is facilitated diffusion? ________________________________________________________ 12. What is the difference in channel proteins and carrier proteins? __________________________________________________________________ 13. Define osmosis. ___________________________________________________________________ _ 14. The 2 parts of a solution are the ________________ and _________________. 15. The concentration of solution _______________ when the amount of _____________ increases. 16. When dynamic equilibrium is reached, do water molecules stop moving? ________ 17. When a cell is in a solution that has the same concentration of water and solute, the cell is said to be in an ____________________________. 18. The cell is at ____________________ with the solution, and there is no net _________________of water. 19. When a cell is in a solution that has a lower concentration of solute, the cell is said be to in a ___________________________. 20. Hypotonic means there is more water ______________ the cell. 21. Water moves ___________ the cell; this causes the cell to _____________. 22. When a cell is placed in a ________________solution, the concentration of solute outside the cell is higher than inside. 23. Hypertonic means there is more water _____________ the cell. 24. Water moves __________ the cell; this causes the cell to ____________. 25. Define active transport. __________________________________________________________ 26. Active transport helps maintain ________________. 27. What is the best-known carrier protein pump in animal cells? _______________________________ 28. ___________________ ions are pumped out, while ______________ ions are pumped into the cell.