Lipids

Lipids are a diverse group of organic compounds that are insoluble in water but soluble in nonpolar solvents. They play important roles in the human body, including energy storage, insulation, and protection of vital organs. The main types of lipids include triglycerides, phospholipids, and steroids.

Triglycerides

Triglycerides are the most common type of lipid found in the human body. They are composed of a glycerol molecule and three fatty acid chains. Triglycerides serve as a concentrated source of energy, as well as insulation and protection for organs.

Phospholipids

Phospholipids are a major component of cell membranes. They have a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails, which help create the structure of the cell membrane and regulate the passage of molecules in and out of the cell.

Steroids

Steroids are a class of lipids characterized by a carbon skeleton consisting of four fused rings. Examples of steroids include cholesterol, which is a structural component of cell membranes, and hormones such as estrogen and testosterone.

Functions of Lipids

Study Guide Questions

What are the main types of lipids?
What is the structure of triglycerides?
How do phospholipids contribute to the structure of cell membranes?
Give examples of steroids and their functions in the body.
What are the functions of lipids in the human body?

◂Science Worksheets and Study Guides Eighth Grade. Earthquakes

Vocabulary/Answer key

Earthquakes

Vocabulary/Answer key

Earthquakes

Vocabulary/Answer key

Earthquakes

Vocabulary/Answer key

Earthquakes

The resources above cover the following skills:

Earth/Space Science: Students will use scientific skills and processes to explain the chemical and physical interactions (i.e., natural forces and cycles, transfer of energy) of the environment, Earth, and the universe that occur over time.

Earth History: Explain how sedimentary rock is formed periodically, embedding plant and animal remains and leaving a record of the sequence in which the plants and animals appeared and disappeared.

Explain how sedimentary rock buried deep enough may be reformed by pressure and heat and these reformed rock layers may be forced up again to become land surface and even mountains.

Explain why some fossils found in the top layers of sedimentary rock are older then those found beneath in lower layers: Folding; Breaking; Uplift; Faulting; Tilting.