Question

lipids include fats, waxes, oils, phospholipids, and steroids. what characteristic do all lipids share?
○ are polymers
○ mix poorly with water
○ have affinity for water
○ are all made of cholesterol

Explanation:

1. Analyze "are polymers": Lipids are not polymers (polymers are made of repeating monomers; lipids don't have a repeating monomer structure like carbohydrates or proteins), so this is incorrect.
2. Analyze "mix poorly with water": Lipids are hydrophobic (water - fearing) or amphipathic (with hydrophobic parts), so they mix poorly with water. This is a key characteristic of all lipids.
3. Analyze "have affinity for water": Lipids are hydrophobic, so they do not have an affinity for water. This is incorrect.
4. Analyze "are all made of cholesterol": Only steroids (a type of lipid) have cholesterol - related structures; fats, waxes, oils, and phospholipids are not made of cholesterol. This is incorrect.

Answer:

B. mix poorly with water