5.3 lipids include fats and steroids.

characteristics of lipids

*lipids are compounds that water trys to ignore. The water avoiding molecules are said to be hydrophobic, whcih also meant water fearing.

Lipids act likea boundary that surrounds and contains the aqueous contents of your cell.

*Some lipids are signals to cells or fats store energy.

Fats

* fat consist of a three carbon backcone called glycerol attched to three fatty acids, which includes long hydrocarbon chains.

*saturated fat is a fat in which all the three fatty acids chains contain the maximum possible number of hydrogen atoms.

*unsaturated fat contains less than the maximum number of hydrogen atoms in one or moreof its fatty acid chains because some of its carbon atoms are doubled bonded to each other.

Steriods

steriods are lipid molecules in which the carbon skeleton forms four fused rongs is called a steriod.

* steriods are classified as lipids because they are hydrophobic, but they are veru different from fats in structure and function. Soem circu;ate your body as a chemical signal.

cholestrol is an essential molecule found in menbranes that surround your cell.

concept check

1. What property do lipids share?

-they share hydrophobic.

2. What are the parts of a fat molecule?

-It contains three glycerol and three fatty acids.

3. Descrive two ways that steroids deffer from fat.

- Steroids are different from fat in structure and function

4. What does the term unsaturated fat mean?

-It means that that the acid chain contains less than the maximum number of hydrogen atoms in one or more of its fatty acid chains.