Chapter 5.3 Summary

• hydrophobic means "water-fearing"
• the function of hydro phobic is really important in starch
• lipids act as boundary and contains watery contents of human cells
• some fat are solid at room temperature
• most animal fats are saturated fats
• the fats in fruits, vegetables, fish are unsaturated fats
• saturated fats are unhealty (large amount)
• steroids are classified a lipid
• cholesterol, a steroid, is found in membranes
• cholesterol has a bad reputation because high level of particular cholesterol-containing substances in the blood increases the risk of getting heart and blood vessel disease

Concept Check 5.3

1. What property do lipids share?

All lipids share the property of hydrophobic. Hydrophpbic means a water-avoiding molecules.

2. What are the parts of a fat molecule?

The parts of a fat molecule are the three-carbon backbone called glycerol attached to three fatty acids, which contain long hydrocarbon chains.

3. Descrive two ways that steroids differ from fats.

The steroids are different from fats in two way. Those two ways are structure and function. The steroids circulate body as chemical signals when fats stores the energy. Also, the steroids are formed from four rings.

4. What does the term unsaturated fat on a food label mean?

The term unsaturated fat on a food label means that the food contains less than the maximum number of hydrogen atoms in one or more of its fatty acid chains because some of its carbon atoms are double-bonded to each other.