cell membrane structure
DESCRIPTION
TRANSCRIPT
![Page 1: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/1.jpg)
![Page 2: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/2.jpg)
• Gatekeeper• Regulates what comes in and out
of the cell• Main components: proteins and
phospholipids• The cell membrane is selectively
permeable• Allows some things through without energy,
but not everything
![Page 3: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/3.jpg)
1.All cells have a cell membrane
2.Functions: a.Controls what enters and exits the cell to maintain an internal balance called homeostasis
b.Provides protection and support for the cell
TEM picture of a real cell
membrane.
![Page 4: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/4.jpg)
• Found only in plant cells and bacteria cells
• Main function is support
![Page 5: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/5.jpg)
• phosopholipids• made of two sides: head and tail• the head is hydrophillic (able to
interact with water)• the tail is hydrophobic (not able to
interact with water)
![Page 6: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/6.jpg)
3.Structure of cell membrane
Lipid Bilayer -2 layers of phospholipidsa.Phosphate head is polar (water loving)
b.Fatty acid tails non-polar (water fearing)
c.Proteins embedded in membrane
Phospholipid
Lipid Bilayer
![Page 7: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/7.jpg)
• carrier proteins• allow larger or difficult molecules to get
through the membrane• sometimes they require energy to
open/close like a door• other times they simply act as a tunnel
![Page 8: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/8.jpg)
Proteins
Membrane movement animation
Polar heads love water & dissolve.
Non-polar tails hide from water.
Carbohydrate cell markers
Fluid Mosaic Model of the cell
membrane
![Page 9: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/9.jpg)
4. Cell membranes have pores (holes) in ita.Selectively permeable: Allows some molecules in and keeps other molecules out
b.The structure helps it be selective!
Pores
![Page 10: Cell membrane structure](https://reader033.vdocuments.us/reader033/viewer/2022061118/54699f30af795925028b46bc/html5/thumbnails/10.jpg)
Outside of cell
Inside of cell (cytoplasm)
Lipid Bilayer
Proteins
Transport Protein Phospholipids
Carbohydratechains
Structure of the Cell Membrane
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Animations of membrane
structure