Flashcards in Biological Molcules - Fats Deck (25)
What are lipids made of?
What type of molecule is a triglyceride?
A long polymer held together by many bonds
What is a key property of lipids and why?
Insoluble - doesn't cause the cell to swell by osmosis
How are triglycerides found in the body?
They form insoluble droplets in cells with hydrophobic tails on outside - micelles
What is a triglyceride made up of?
- 1x glycerol
- 3x fatty acid tails
What bonds hold triglycerides together?
Draw a triglyceride
Are the fatty acid tails hydrophobic/hydrophilic?
Are the glycerol molecules hydrophobic/hydrophilic?
Where are saturated lipids found?
Where are unsaturated lipids found?
What does saturated lipids mean?
No carbon-carbon double bond between carbon atoms
What does unsaturated lipids mean?
Carbon-carbon double bond between carbon atoms
What do the chains of unsaturated lipids contain?
Do unsaturated/saturated lipids have a higher melting point?
Type of lipid needed in small amounts for normal body functions
What is cholesterol needed for?
Maintaining cell membranes
How is cholesterol transported in the blood?
Attaches to proteins to form lipoproteins
What are the two types of lipoprotein?
- LDL : low density lipoprotein
- HDL: high density lipoprotein
What are HDLs mainly made of?
What do HDLs do? 4
- Lower blood cholesterol
- Carry cholesterol from blood to liver where it is destroyed
- Reduce fat deposits
- Reduce formation of atheroma
What are LDLs mainly made of?
What do LDLs do? 5
- Increase blood cholesterol
- Carry cholesterol from liver to the blood
- Increase fat deposits
- Increase formation of atheroma
What is the best ratio of HDL:LDL to minimise CVD risk?
High HDL:LDL ratio