lipids - 1 Flashcards

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1
Q

what do lipids all contain

A

hydrocarbons

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2
Q

2 types of lipids we need to know

A

phospholipids
triglycerides

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3
Q

what are triglycerides made up of

A

one molecule of glycerol
three fatty acid tails

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4
Q

are the fatty acid tails hydrophobic or hydrophilic and what does this mean

A

hydrophobic - make the lipids insoluble in water

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5
Q

2 types of fatty acids

A

saturated and unsaturated

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6
Q

structure of saturated fatty acids

A

dont have double bonds between carbon atoms

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7
Q

structure of unsaturated fatty acids

A

have double bonds between carbon atoms - cause chain to kink

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8
Q

are triglycerides formed by condensation or hydrolysis

A

condensation

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9
Q

which bond forms between the glycerol and fatty acid in the triglyceride

A

ester bond

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10
Q

difference between phospholipids and triglycerides

A

one of the fatty acid tails has been replaced with a phosphate group

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11
Q

in phospholipids, are the tails hydrophobic or hydrophilic

A

hydrophobic - repel water

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12
Q

whats the test for lipids

A

emulsion

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13
Q

3 steps for emulsion test

A
  1. shake test substance with ethanol for a min, pour solution into water
  2. any lipid will show up as a milky emulsion
  3. the more lipids, more noticeable the milky colour
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