Which of the following statements about lipids are not true? Steroids are a class of lipids which do not contain any fatty acids. Yes. That's true. Remember, the first branching off of lipids are our fatty acids and our steroids. If steroids contain fatty acids, they wouldn't be different from fatty acids themselves.

All lipids are insoluble in nonpolar solvents, but soluble in polar solvents. So remember, these lipids, many of the lipids contain fatty acids, which are long carbon chains. Those long carbon chains make them nonpolar, which would mean that they are soluble in nonpolar solvents and insoluble in polar solvents. This statement here is false, so this is our answer.

If we look at our other options, certain lipids play an important role as components of biological membranes. That is one of the primary lipid functions that do exist, so this is true.

Lipids contain large numbers of nonpolar Carbon-Hydrogen bonds making them overall nonpolar. This is true. A lot of these lipids contain fatty acid chains which are just carbon-hydrogen bonds which are nonpolar. So overall they're nonpolar.

Steroids themselves also contain fused carbon rings. Those are also sites of being nonpolar. So here the only statement that's false will be option B.