Lipids Flashcards

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1
Q

What are the 2 groups of lipids?

A

triglyceride & phospholipids

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2
Q

What is the structure of a fatty acid?

A
  • R-group attached to hydrocarbon chain (saturated or unsaturated)
  • carboxyl group (COOH)
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3
Q

What is the difference between saturated & unsaturated fatty acids?

A

saturated has no double carbon-carbon bond whilst unsaturated has at least one in the hydrocarbon chain which creates a kink in the chain

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4
Q

How do triglycerides form?

A

one glycerol molecule joined to 3 fatty acids forming 3 ester bonds by a condensation reaction which produces 3 molecules of water

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5
Q

How are the properties of triglycerides related to its structure?

A

function: energy storage
- high ratio of C-H bonds to C atoms - used in respiration to release more energy than same mass of carbohydrates
- hydrophobic/non-polar - clumps together as droplets which don’t affect water potential & can be used for water proofing

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6
Q

What is the structural difference between triglycerides & phospholipids?

A

phospholipids have a phosphate group instead of one of the fatty acid tails

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7
Q

How are the properties if phospholipids related to its structure?

A

function: form a bilayer in plasma membrane allowing diffusion of non-polar substances and restricting polar substances
- phosphate heads are hydrophilic to point outwards
- fatty acid tails are hydrophobic to point inwards

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8
Q

What is the test for lipids?

A
  1. Add ethanol, shake & then add water
  2. Milky white emulsion produced from positive test
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