Chapter 5 Sec 3

Summary

• In this section, they talk about lipids which also includes fats and steroids.


• Lipids are water-avoiding compounds that found in oil and prevents oil from mixing together with water based liquids. Lipids are also fats that store energy in your body.


• Fat molecules contain three-carbon backbones known as glycerol, they are attached to 3 fatty acids that contain long hydrocarbon chains. They are also used as fatty tissues to cushion your organs from impact provide insulation to your body.


• Saturated fats are fats that contain the maximum amount of hydrogen atoms in their three fatty acid chains. Unsaturated fats are the fats that contain less than the maximum amount of hydrogen atoms.


• Steroids are lipid molecules that their carbon skeletons forms four fused rings. They are also hydrophobic but are different from fats in their structure. Steroids have two common forms; testosterone and estrogen. Testosterone are found in men and estrogen are found in women. Cholesterol are the best steroids because you need it for covering membranes but too much is bad.

Concept Check

1. What property do lipids share?

Lipids cannot mix well with water based liquids and they can be solids or liquids.

2. What are the parts of a fat molecules?

They have three carbon backbones known as glycerol that are attached to three different kinds of fatty acids. The acids are long hydrocarbon chains.

3. Describe two ways that steroid differ from fats.

Steroids have can change a person's characteristics by two well known steroids known as testosterone and estrogen. Their carbon skeletons forms four fused rings and are different when one atoms is located differently than the other.

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

It means that the fat can be found in fruits, vegetable and fish. Such as corn oil, olive oil and fish oil.

Example of unsaturated fat