1. Chapter 7 Section 3 Cell Boundaries
Biology pgs

2. Objectives Identify Describe Explain
_____________________the main functions of the cell membrane and the cell wall
________________ what happens during diffusion
_____________________ the processes of osmosis, facilitated diffusion, and active transport.
Describe
Explain

3. Membranes Cell membrane Cell wall
All cells are surrounded by a _____________________.
Many cells also produce a strong supporting layer around the membrane known as a __________________
Cell walls are found in plants, algae, fungi, and many prokaryotes.
Cell membrane
Cell wall

4. Cell Membrane Outside of cell Carbohydrate chains Proteins
The cell membrane regulates what enters and leaves the cell.
Inside of cell (cytoplasm)
Protein channel
Lipid bilayer
Copyright Pearson Prentice Hall

5. Cell Membrane Lipid bilayer
The composition of nearly all cell membranes is a double-layered sheet called a _________________.
Lipid bilayer
The cell membrane regulates what enters and leaves the cell.
Lipid bilayer
Copyright Pearson Prentice Hall

6. Diffusion Through Cell Boundaries
Particles in a solution tend to move from an area where they are more concentrated to an area where they are less concentrated.
This process is called _________________.
diffusion

7. Osmosis is the diffusion of water.
When concentrations of solutions are the same on both sides it is _______________.
Isotonic

8. hypertonic
A _________________ environment means a higher concentration of solutes outside the cell. Water will move out of the cell.
A ___________________ environment has a lower concentration of solutes. Water will move into the cell.
hypotonic

9. Facilitated diffusion
The movement of specific molecules across cell membranes through protein channels is known as _________________________.
Facilitated diffusion

10. Active transport energy Active Transport
Sometimes cells move materials in the opposite direction. This process is known as _______________________.
Active transport requires _____________or ATP.
Active transport
energy

11. endocytosis exocystosis
_________________________ is the process of taking material into the cell by means of infoldings, or pockets, of the cell membrane.
During _______________________, the membrane of the vacuole surrounding the material fuses with the cell membrane, forcing the contents out of the cell.
exocystosis