Lipids Review Worksheet
Name: ___________________
1. What elements do lipids contain?
C, H, O
2. How can you tell a lipid from a carbohydrate from its molecular formula?
carbohydrates have twice as many hydrogens as oxygen (hydrate for water), lipids have very few oxygens
3. Draw a molecule of glycerol and circle the –OH (hydroxyl) groups. Give the molecular formula for glycerol.
C3H8O3
4. List three differences between saturated fatty acids and unsaturated fatty acids.
Saturated - solid at room temp, found in animal fat, only single carbon to carbon bonds
Unsaturated - liquid at room temp, found in plant fat, some double carbon to carbon bonds
5. How are triglycerides and phospholipids similar? Different?
triglyrcerides have three fatty acids "tails" while phospolipids only have 2 fatty acid "tails" (one fatty acid
replaced by a phosphate group
6. Name two examples of steroids.
testosterone and estrogen
3 fatty acids + ____
1 glycerol  1 ____________
triglyceride
7. Complete the equations: ____
+ 3 H20
waxes,
8. Three examples of lipids are triglycerides, phospholipids and ________________________.
9.
glycerol
Triglycerides are three fatty acid chains attach to a _______________.
single
10. Saturated fatty acids have _________
bonds between the carbon atoms. These fatty acids originate
solid
animals
from _____________
and are __________
at room temperature.
double
11. Unsaturated fatty acids have _________
bonds between the carbon atoms. These fatty acids originate
plants
liquid
from _____________
and are __________
at room temperature.
phosphate
12. Phospholipids are modified triglycerides that have one fatty acid chain replaced by a ________________.
4
13. Cholesterol molecules have ______________________
interconnected carbon rings