Lipids! But first

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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 Whats 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 cant dissolve in water. Theyre
  hydrophobic.

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What do Lipids do?
Structure
Honeybee hives are made out of a type of lipids
called waxes
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What do Lipids do?
Defense
Earwax helps prevent bacterial infections
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What do Lipids do?
Hormones
Estrogen is the female sex hormone in humans.
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What do Lipids do?
Energy Storage
Fats can store lots of energy
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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
Hydrophilic
Hydrophobic
Hydrophilic
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Arent 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 cant be used directly by cells
• Cell membranes are made of a lipid bilayer.