Honors Biology Chapter 7Section 3 Cell Boundaries

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Cell membranes are composed of two phospholipid layers.
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Presentation transcript:

Honors Biology Chapter 7Section 3 Cell Boundaries SC B- 2.5: Explain how active, passive, and facilitated transport serve to maintain the homeostasis of the cell.

Cell Membrane surround all cells is a thin, flexible barrier that acts like the cell’s “gate keeper” made of lipid-bilayer provides protection & support

Cell Membrane: Lipid-Bilayer Fluid Mosaic Model phospholipids

Plasma Membrane Fluid Mosaic Model resembles an ever-moving sea of fluid lipids that has large proteins bobbing along throughout the lipids

Membrane Lipids Phospholipids (~70% of membrane) Cholesterol: changes fluidity of membrane Glycolipids sugar molecule on lipid

Membrane Proteins Integral Proteins Peripheral Proteins go all the way thru the membrane channel proteins receptor proteins Peripheral Proteins on inside or outside of membrane +/- attached to integral proteins

Cell Membrane

Cell Walls found in: secreted by cell membrane plant cells fungi cells algae bacteria secreted by cell membrane allow O2, CO2, glucose, & H2O to pass through

Cell Wall

Cell Wall

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