Untitled Document 1. Escherichia coli bacteria. Lipids can serve as energy sources for cells. All cell membranes contain lipids. All cells contain lipids.
All lipids form bilayer membranes.
Lipids include both fatty acids and their derivatives. CoA. b. glucose. 3 billion bp 18. Enzymes are a specialized class of proteins. Enzymes contain an active site by which they bind to a substrate.