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Structure and function of cell components (i)Carbohydrates (ii)Lipids (iii)Proteins (iv)Nucleic Acids (v)Membranes (vi)Cytoskeleton.

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Presentation on theme: "Structure and function of cell components (i)Carbohydrates (ii)Lipids (iii)Proteins (iv)Nucleic Acids (v)Membranes (vi)Cytoskeleton."— Presentation transcript:

1 Structure and function of cell components (i)Carbohydrates (ii)Lipids (iii)Proteins (iv)Nucleic Acids (v)Membranes (vi)Cytoskeleton

2 Cell membranes Many organelles contain or are enclosed by membranes, including Plasma membrane Plasma membrane Mitochondria Mitochondria Chloroplasts Chloroplasts Nuclear envelope Nuclear envelope Endoplasmic reticulum Endoplasmic reticulum Golgi apparatus Golgi apparatus Lysosomes Lysosomes Microbodies (aka perioxisomes) Microbodies (aka perioxisomes)

3 Role of Cell Membranes Based on the functions of the above organelles / membranes write down some of the roles of the membranes in the cells (Leave some space as we will be adding to this list)

4 Structure of Cell membranes Fluid Mosaic Model

5 Electron micrograph of cell membrane

6 Structure of Cell membranes Lipids Remember lipids have hydrophilic head and hydrophobic tails Remember lipids have hydrophilic head and hydrophobic tails To avoid the hydrophobic tails coming in contact with water a continuous bilayer sphere is formed. To avoid the hydrophobic tails coming in contact with water a continuous bilayer sphere is formed. Therefore hydrophobic interactions hold membranes together Therefore hydrophobic interactions hold membranes together

7 Structure of Cell Membranes Proteins Integral proteins (intrinsic) Integral proteins (intrinsic) Proteins that are embedded in the membrane They are held in place by hydrophobic interactions (integral proteins have hydrophobic groups on their outer surface) Peripheral proteins (extrinsic) Peripheral proteins (extrinsic) Proteins attached to the surface of the membrane (often forming non-covalent bonds with integral proteins)

8 Proteins cont…

9 Function of Membrane Proteins Attachment Cytoskeleton Cytoskeleton Extracellular matrix Extracellular matrix Intercellular Junctions Plasmodesmata Plasmodesmata Tight Junctions Tight Junctions Gap Junctions Gap Junctions Desmosomes Desmosomes

10 Function of Membrane Proteins Transport Carrier Proteins Carrier Proteins Channel Proteins Channel ProteinsReceptorsEnzymes Cell to Cell recognition

11 Learning Activities Use all resources to find out more about the functions of membrane proteins. Based on the functions of proteins, add to your list on the role of membranes in cells Read DART pgs 54 – 56 Scholar 5.1 (of interest, but you arent required to know it, may be the history of understanding the cell membrane structure) The Structure of Membranes worksheet The Role of Membranes worksheet Advanced Higher Questions


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