lipids! but first… do now: in our pectinase experiment: what is the independent variable? what is...
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Lipids! But first…Do Now:
In our pectinase experiment:
What is the independent variable?
What is the dependent variable?
What is the control group?
What variables were constant for both samples?
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Lipids: What’s a Lipid anyhow?
• Lipids come in a variety of shapes and sizes.
• The one thing all lipids have in common is the fact that they can’t dissolve in water. They’re hydrophobic.
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What do Lipids do?
Honeybee hives are made out of a type of lipids called waxes
Structure
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What do Lipids do?
Earwax helps prevent bacterial infections
Defense
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What do Lipids do?
Estrogen is the female sex hormone in humans.
Hormones
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What do Lipids do?
Fats can store lots of energy
Energy Storage
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But most Importantly, a lipid bilayer surrounds EVERY LIVING CELL
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Cell membranes are made of phospholipids
Hydrophilic “head”
Hydrophobic “tail”
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A Cell Membrane has lots of phospholipids
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Cell Membrane = Phospholipid Bilayer
Hydrophobic
Hydrophilic
Hydrophilic
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Aren’t Fats bad for you?
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Yes and No…
Trans-fatty acids common in processed foods have been linked to heart disease
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But some are healthy
Omega-3 fatty acids common in fish have been shown to HELP cardiovascular health!
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Careful – They store a lot of energy!
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The bottom line on lipids• Lipids are NOT soluble in water.
• Lipids are not made of monomers like the other macromolecules.
• Lipids have many functions, from earwax to hormones.
• Lipids are used for LONG-TERM energy storage, since they can’t be used directly by cells
• Cell membranes are made of a lipid bilayer.