Steroids

Definition

Steroids are a class of lipids characterized by a carbon skeleton with four fused rings. They play various roles in biological processes, including acting as hormones and structural components of cell membranes.

5 Must Know Facts For Your Next Test

1. Steroids include important biological molecules such as cholesterol, testosterone, and estrogen.
2. Cholesterol is a precursor for the synthesis of other steroids.
3. Steroids are hydrophobic and can pass through cell membranes easily.
4. They function as signaling molecules that regulate metabolism, immune response, and other vital functions.
5. Plants also produce steroids known as phytosterols.

Review Questions

• What is the basic structure of steroids?
• Name three important steroids found in the human body.
• How do steroids interact with cell membranes?

Related terms

Lipids:

Organic compounds that are fatty acids or their derivatives and are insoluble in water but soluble in organic solvents.

Cholesterol: A type of steroid found in cell membranes that serves as a precursor for other steroid hormones.

Hormones:

Chemical messengers produced by glands that regulate various physiological processes in the body.