Lipids

Question 1

Triglyceride

structure

Answer 1

-glycerol
-3 fatty acid molecules
(ester bonds)

Question 2

Phospholipid

structure

Answer 2

-glycerol
-2 fatty acid molecules
(ester bonds)
-phosphate group

Question 3

Triglyceride

Function

Answer 3

Insoluble
=water potential not affected= water doesn’t diffuse into/out of cells by osmosis

Low mass to energy ratio
=much energy stored in small volume#

High ratio of C-H bonds to C atoms
=good energy source

Question 4

Phospholipid

Function

Answer 4

Phospholipid bilayer in membranes
(controls substances passing in and out of cell)
-hydrophilic+ heads, hydrophobic tails

Can form glycolipids for cell recognition

Question 5

Saturated fatty acid definition

Answer 5

A fatty acid with no C=C bonds
(is fully saturated with hydrogen)

Fats

Question 6

Unsaturated fatty acid definition

Answer 6

A fatty acid with C=C bonds
(is not fully saturated with hydrogen)

Oils

Question 7

Ester bond

Answer 7

• the bond between glycerol and a fatty acid
• found in triglycerides and phospholipids

-formed in condensation reaction
(involving elimination of water)

Question 8

Emulsion test for lipids

Answer 8

-add ethanol and shake
-THEN add water
(+) cloudy white emulsion