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 contain nitrogen and phosphorus atoms. carbon atoms are arranged in two long chains in phospholipids. phospholipids are energy storage molecules. which three elements are found in every lipid? some lipids contain additional elements. sulfur oxygen carbon phosphorus nitrogen hydrogen

Explanation:

1. For "Phospholipids contain nitrogen and phosphorus atoms": Looking at the chemical structure, there is a $-N^+$ (from the choline group) and a $P$ (phosphorus) in the phosphate group, so this is true.
2. For "Carbon atoms are arranged in two long chains in phospholipids": The structure shows two long hydrocarbon chains (fatty acid tails) made of carbon atoms, so this is true.
3. For "Phospholipids are energy storage molecules": Triglycerides (another lipid) are main energy storage lipids; phospholipids are mainly for cell membranes, so this is false (the original check here is incorrect, but we analyze based on knowledge).
4. For the elements in every lipid: Lipids are made of carbon, hydrogen, and oxygen (e.g., triglycerides: $C$, $H$, $O$). Sulfur, phosphorus, nitrogen are not in all lipids (e.g., simple fats have only $C$, $H$, $O$). So correct elements are carbon, hydrogen, oxygen.

Answer:

• True statements (correct ones):
• Phospholipids contain nitrogen and phosphorus atoms.
• Carbon atoms are arranged in two long chains in phospholipids.
• Elements in every lipid: Carbon, Hydrogen, Oxygen.