3.8

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What are lipids?

they are diverse compounds that are grouped together because of one trait, they mix poorly with water
Are lipids hydrophilic or phobic?

phobic
What are in feathers that helps birds stay afloat?

oil
What are oils?

liquid fat
what is a fat

a large lipid made from two smaller kinds of smaller molecules: glycerol and fatty acids
What is a glycerol?

a glycerol is an alcohol with three carbons, each bearing a hydroxyl group
What is a fatty acid?

consists of a carboxyl group and a hydro carbon chain
How are the carbons in the fatty acid chain linked together and hydrogen atoms?

By non polar covalent bonds, making the hydrocarbon chain hydrophobic
what is the main function of fat?

energy storage
A gram of fat is equivalent to ?

a gram of polysaccharide such as starch
Why is it better for an animal to store fat as a polysaccharide such as starch?

other forms of carbohydrates are bulkier
What other functions do fats have?

to insulate the body, and cushions vital organs
How can a fatty acid molecule link to a glycerol molecule?

dehydration synthesis
What is a synonym for fat?

tryglyceride
Why is fat also called a tryglyceride?

the 3 fatty acides
Are fatty acids only able to form 1 bond?

no, they can do 2
What causes kinks or bends in the carbon chain?

fatty acids containing double bonds
What does it mean to be unsaturated?

Fatty acids and fats with double bonds in the carbon chain
What does it mean to have less than the maximum number of hydrogens?

unsaturated
What do the kinks in unsaturated fats do?

prevent the molecules from packing tightly together and solidifying at room temp
what does hydrogenation do?

also creates transfat that associates with heart disease.

Author

see.jerald

77931

Card Set

3.8

Description

Fats are lipids that are mostly energy-storage molecules

Updated

2011-04-07T01:44:41Z

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