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Lipids & Cell Membranes

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Presentation on theme: "Lipids & Cell Membranes"— Presentation transcript:

1 Lipids & Cell Membranes
Honors Biology

2 Objectives Construct and revise an explanation based on evidence for how carbon, hydrogen, and oxygen from sugar molecules may combine with other elements to form amino acids and/or other large carbon-based molecules. Plan and conduct an investigation to provide evidence how feedback mechanisms maintain homeostasis.

3 Lipids

4 Recall: Macromolecules
BIG biological molecules Made of smaller parts Monomers Carbon-based (organic) Carbohydrates Nucleic acids Proteins Lipids

5 Lipids Monomer? Used for: Examples: Found in: Glycerol head
Fatty acid tail Used for: Long term energy storage Insulation Major component of membranes Signaling molecules and hormones Examples: Fats, oils, waxes Found in: All the good tasting foods 

6 Cell Membranes

7 Cellular Biology Review
All cells have cell membranes Some cells (eukaryotes) have membranes surrounding organelles Example: nucleus All cells need to import and export molecules in order to function properly and maintain homeostasis

8 Cell Membrane Function: Homeostasis!
Regulate passage of nutrients, wastes, gases, and water into and out of cell Selectively permeable – “picky” about what passes Separate cell from the environment Allow cells to communicate with other cells via receptors on the surface

9 Cell membranes are fluid mosaics of lipids and proteins

10 Structure of the Cell Membrane
Made of phospholipid bilayer Phosphate (hydrophilic) “head” Lipid (hydrophobic) “tail” Phospholipid bilayer

11 Structure of the Cell Membrane
Protein channels Allow large molecules to pass through Protein channels

12 Structure of the Cell Membrane
Receptor Protein Receives messages from outside the cell Cell communication is key for homeostasis! Receptor Protein

13 Structure of the Cell Membrane
Cholesterol Lipids that prevent freezing Helps membrane remain fluid (flexible) Cholesterol

14 Structure of the Cell Membrane
Integral proteins Help with cell signaling Act in cell recognition (“name tags”) Integral Protein

15 Structure of the Cell Membrane
Peripheral proteins Give structure to cell Cytoskeleton can anchor Peripheral Protein

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