Question

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

Explanation:

1. For "Phospholipids have carbon atoms arranged in two long chains": By observing the chemical structure diagram, we can see two long chains of carbon atoms (the fatty acid tails), so this statement is true.
2. For "Phospholipids contain only carbon and hydrogen atoms": Looking at the structure, we can see atoms like oxygen (O), phosphorus (P), and nitrogen (N) (e.g., in the phosphate - head group with $-N^+$ and $-P - O -$ groups), so this statement is false.
3. For "Cell membranes contain phospholipids": The text at the beginning states "They are the building blocks of cell membranes", so this statement is true.

Answer:

• True: Phospholipids have carbon atoms arranged in two long chains.
• False: Phospholipids contain only carbon and hydrogen atoms.
• True: Cell membranes contain phospholipids.