Presentation is loading. Please wait.

Presentation is loading. Please wait.

Cell Membrane Function: Allow certain molecule in and out of the cell

Published byDeirdre Todd Modified over 5 years ago

Similar presentations

Presentation on theme: "Cell Membrane Function: Allow certain molecule in and out of the cell"— Presentation transcript:

1 Cell Membrane Function: Allow certain molecule in and out of the cell
Structure: Lipids Phospholipids Cholesterol Proteins Integral proteins Channel proteins Receptor proteins Peripheral proteins Enzyme proteins Carbohydrates glycoprotein

2 Animal Cell surface Extracellular matrix (Outside Cell)
Collagen fibers in network of glycoproteins Support Adhesion Movement Regulation Cytoskeleton (Inside Cell) Protein fibers

3 Lipids of cell membrane
Membrane is made of phospholipids phospholipid bilayer phosphate hydrophilic inside cell outside cell lipid hydrophobic

4 Phospholipids

5 Cholesterol Lipid with in the membrane
Decrease fluidity of cell membrane

6 Semi-permeable membrane
Need to allow passage through the membrane But need to control what gets in or out membrane needs to be semi-permeable sugar aa lipid H2O salt NH3 So how do you build a semi-permeable membrane?

7 Phospholipid bilayer What molecules can get through directly?
fats & other lipids can slip directly through the phospholipid cell membrane, but… what about other stuff? lipid inside cell outside cell salt NH3 sugar aa H2O

8 Simple diffusion across membrane
Which way will lipid move? lipid lipid lipid inside cell lipid lipid lipid low high lipid outside cell lipid lipid lipid lipid lipid lipid lipid

9 Permeable cell membrane
Need to allow more material through membrane needs to be permeable to… all materials a cell needs to bring in all waste a cell needs excrete out all products a cell needs to export out inside cell aa H2O sugar lipid “holes”, or channels, in cell membrane allow material in & out salt NH3 outside cell

10 Diffusion through a channel
Movement from high to low sugar sugar Which way will sugar move? sugar inside cell sugar sugar low high outside cell sugar sugar sugar sugar sugar sugar sugar

11 Semi-permeable cell membrane
But the cell still needs control membrane needs to be semi-permeable specific channels allow specific material in & out inside cell H2O aa sugar salt outside cell NH3

12 How do you build a semi-permeable cell membrane?
What molecule will sit “comfortably” in a phospholipid bilayer forming channels bi-lipid membrane protein channels in bi-lipid membrane what properties does it need?

13 Why proteins? Proteins are mixed molecules hydrophobic amino acids
stick in the lipid membrane anchors the protein in membrane hydrophilic amino acids stick out in the watery fluid in & around cell specialized “receptor” for specific molecules

14 Receptor Proteins Integral Membrane Protein
Allows for messenger to bind to cell Recognition Cell Response

15 Peripheral Enzyme Proteins
Found on one side of cell, usually inside Sends messages inside cell Initiates cell response

Download ppt "Cell Membrane Function: Allow certain molecule in and out of the cell"

Similar presentations

Cell Membranes & Movement Across Them

Cell Membranes & Movement Across Them
AP Biology 2007-2008 Ch. 5.1 Plasma Membrane Structure and Function.

AP Biology Ch. 5.1 Plasma Membrane Structure and Function.
The Cell Membrane.

The Cell Membrane.
I. The Cell (aka Plasma) Membrane Overview  Cell membrane separates living cell from nonliving surroundings  Controls traffic in & out of the cell.

I. The Cell (aka Plasma) Membrane Overview  Cell membrane separates living cell from nonliving surroundings  Controls traffic in & out of the cell.
The Cell Membrane (Ch. 7) Phospholipids Fatty acid Phosphate Amphipathic – Phosphate head hydrophilic – Fatty acid tails hydrophobic Arranged as a bilayer.

The Cell Membrane (Ch. 7) Phospholipids Fatty acid Phosphate Amphipathic – Phosphate head hydrophilic – Fatty acid tails hydrophobic Arranged as a bilayer.
The Cell Membrane. Overview Cell membrane separates living cell from nonliving surroundings – thin barrier = 8nm thick Controls traffic in & out of the.

The Cell Membrane. Overview Cell membrane separates living cell from nonliving surroundings – thin barrier = 8nm thick Controls traffic in & out of the.
 What is the cytoplasm? ◦ Cyto = “cell” ◦ Plasma= “liquid substance of the cell”  Cytoplasm? ◦ Clear, gelatinous fluid inside the cell.

 What is the cytoplasm? ◦ Cyto = “cell” ◦ Plasma= “liquid substance of the cell”  Cytoplasm? ◦ Clear, gelatinous fluid inside the cell.
Lipids & Cell Membranes

Lipids & Cell Membranes
AP Biology 2005-2006 Cell Membrane and the Movement across it!

AP Biology Cell Membrane and the Movement across it!
AP Biology 2005-2006 Chapter 7. Movement across the Cell Membrane.

AP Biology Chapter 7. Movement across the Cell Membrane.
Functions of the plasma membrane 1.Holds the cell together 2.Controls what goes in and out (diffusion, osmosis, active transport) 3.Protects the cell.

Functions of the plasma membrane 1.Holds the cell together 2.Controls what goes in and out (diffusion, osmosis, active transport) 3.Protects the cell.
Regents Biology 2006-2007 Cell Membranes & Movement Across Them.

Regents Biology Cell Membranes & Movement Across Them.
2007-2008 The Cell Membrane What does the cell membrane do? Separates living cell from aqueous environment Controls traffic in & out of the cell –allows.

The Cell Membrane What does the cell membrane do? Separates living cell from aqueous environment Controls traffic in & out of the cell –allows.
Membrane Structure and Function. What is the Function of The Plasma Membrane? Boundary Must be selectively permeable.

Membrane Structure and Function. What is the Function of The Plasma Membrane? Boundary Must be selectively permeable.
AP Biology The Cell Membrane AP Biology Overview  The cell membrane separates the inside of a living cell from its surroundings  Function to maintain.

AP Biology The Cell Membrane AP Biology Overview  The cell membrane separates the inside of a living cell from its surroundings  Function to maintain.
Cell Membranes.

Cell Membranes.
The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer “repelled by water” “attracted to water”

The Cell Membrane Phospholipids Phosphate head hydrophilic Fatty acid tails hydrophobic Arranged as a bilayer “repelled by water” “attracted to water”
3.3 Cell Membrane TEKS 3E, 4B, 9A KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.

3.3 Cell Membrane TEKS 3E, 4B, 9A KEY CONCEPT The cell membrane is a barrier that separates a cell from the external environment.
Cell Membrane. Basic Membrane Structure  Selective permeability  Amphipathic~ hydrophobic & hydrophilic regions  1930’s-50’s- Davison- Danielli “sandwich”

Cell Membrane. Basic Membrane Structure  Selective permeability  Amphipathic~ hydrophobic & hydrophilic regions  1930’s-50’s- Davison- Danielli “sandwich”
Biology Warm-Up 1. What is the function of the cell membrane? 2. What is the cell membrane composed of? Learning Goal  Understand the relationship between.

Biology Warm-Up 1. What is the function of the cell membrane? 2. What is the cell membrane composed of? Learning Goal  Understand the relationship between.

Similar presentations

Ads by Google