23.  Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport? 

35. For the process of diffusion to occur, molecules must  

15. Plants, fungi and bacterial all have:  

11. When an atom or molecule gains one or more electrons, it is said to be:  

36. Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include  

22.  Osmosis is the diffusion of water across a membrane in response to the concentration of one or more of the ______. 

37. What is the main component of an animal cell membrane?  

44. THINK:  Matt is studying how the protein transferrin enters cells. He examines cells that have taken up transferrin, and finds clathrin-coated vesicles. What mechanism was used to take transferrin into the cell?  

28. A type of transport of a solute across a membrane, up its concentration gradient, using protein carriers driven by the expenditure of chemical energy (ATP) is known as  

24. Osmosis occurs as water can cross the lipid bilayer through specialized channels for water movement called ________________.