Question

phospholipids are another type of lipid. they are the building blocks of cell membrane model shows the chemical structure of a phospholipid. select the true statements. cell membranes contain phospholipids. phospholipids have carbon atoms arranged in two long chains. phospholipids contain only carbon and hydrogen atoms.

Explanation:

• For statement A: The text states "Phospholipids... are the building blocks of cell membranes", so this is true.
• For statement B: The chemical structure shows two long carbon - hydrogen chains (the fatty acid tails), so this is true.
• For the third statement: The structure includes oxygen, phosphorus, and nitrogen (e.g., in the phosphate - head group with $\ce{N}$ in the choline - like part), so phospholipids do not contain only carbon and hydrogen. Thus, this statement is false.

Answer:

A. Cell membranes contain phospholipids.
B. Phospholipids have carbon atoms arranged in two long chains.