Question

multiple choice question
a ______ is a common signaling molecule derived from a fatty acid.
phospholipid
prostaglandin
steroid
hormone

Explanation:

Prostaglandins are signaling molecules derived from fatty - acids. Phospholipids are a class of lipids but not mainly known as signaling molecules derived from fatty - acids. Steroids are derived from cholesterol. Hormones are a broad category and not all are derived from fatty - acids.

Answer:

B. prostaglandin