Lecture 15 - Lipids Intro Flashcards Preview

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Flashcards in Lecture 15 - Lipids Intro Deck (14):
0

Role of lipids?

Energy storage
Structure
Signaling
Cofactors and pigments

1

Name the energy storage lipids

Fatty acids
Triglycerides
Waxes

2

Memorize these about fatty acids...

1. Carboxylic acids with hydrocarbon chains (4–36 carbons)
2. Oxidation is highly exergonic (energy store)
3. Even number of carbons (synthesized from C_2 units)
4. Number of carbons and degree of unsaturation determine physical properties
5. Name specifies chain length and with # and location of double bonds relative to carbonyl carbon

3

True or false? Saturated fatty acid chains freely rotate

True

4

The difference in melting points of fatty acids is due to what?

Due to the difference in packing

5

Memorize these about triglycerides (triacylglycerols)

1. Three fatty acid in ester linkage to glycerol
2. Nonpolar, hydrophobic molecules
3. Major source of metabolic fuel stored in adipose tissue and lipid vacuoles in plants

6

Memorize these about waxes...

1. Ester of saturated and unsaturated long – chain fatty acid with long – chain alcohols
2. Useful as metabolic fuel
3. High melting point and water repellant

7

Memorize these about glycerophospholipids

1. Glycerol 3-phosphate with ester linked fatty acids at C1 and C2 positions (hydrophobic "tails")
2. Phosphodiester-linked highly polar, charged head group at C3 (hydrophilic)

8

Memorize these about ether-linked lipids

1. Glycerol 3-phosphate with ether linked fatty acid at C1 and ester linked fatty acid at C2 positions
2. Common in heart tissue (plasmalogen)
3. Molecular signal (platelet-activating factor)

9

1. Glycerol with ester linked fatty acids at C1 and C2 positions (hydrophobic "tails")
2. A head group at C3 of glycerol with a glycosidic linkage to a mono or disaccharide of galactose (phosphate free)
3. These are located in internal membranes of chloroplasts so probably most abundant lipid in nature

Plant lipids: Galactolipids

10

1. Membrane lipids with long-chain (32 carbon) branched hydrocarbons ether linked to glycerols at each end
2. Stable under extreme conditions

Archaea Lipids

11

1. Long – chain fatty acid amide linked at C2 to long – chain alcohol, sphingosine
2. Polar head group joined by a glycosidic linkage or phosphodiester bond

Sphingolipids

12

True or false? Glycosphingolipids have diverse sugar groups important for cell recognition (e.g. determining blood group)

True

13

1. Fused rings of 6-carbons and 5-carbon
2. Metabolic precursor for steroid hormones and bile acids
3. Cholesterol is major component of animal plasma membranes
4. Very important to physical properties and organization of membranes

Sterol