Question

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Explanation:

1. Phospholipids and cell membranes: Cell membranes are mainly composed of a phospholipid bilayer, so this statement is true.
2. Structure of phospholipid: A phospholipid has one glycerol, two fatty acids, and a phosphate - containing group. The statement "A phospholipid is made when one glycerol molecule combines with three fatty acids" is incorrect (it should be two fatty acids), but if we assume there is a mis - understanding in the question's options or a typo, and we are to check the given options as per the problem's context, we analyze each:

• The first option is correct as phospholipids are a major component of cell membranes.
• The second option: Actually, phospholipids have two fatty acids (triglycerides have three). But if we consider the given option, maybe there is an error, but if we go by the model (the model shows two fatty acid tails? Wait, no, the model's structure: looking at the diagram, the glycerol is connected to two fatty acids and a phosphate - containing group. Wait, maybe the option is wrong, but let's check the other options.
• Third option: Triglycerides are made of glycerol and three fatty acids (no N or P). Phospholipids have a phosphate group (with P) and in the given structure, there is a nitrogen - containing group ($\text{CH}_3 - \text{N}^+ - (\text{CH}_3)$), so this statement is true.
• Fourth option: In the phospholipid structure, the fatty acid chains are non - polar and are called tails (the phosphate - containing group is the head), so this statement is true.
• Wait, but the second option is incorrect because phospholipids have two fatty acids (triglycerides have three). Maybe there is a mistake in the option, but if we are to select the true statements from the given options:
• "Phospholipids are used to build cell membranes." - True.
• "A phospholipid is made when one glycerol molecule combines with three fatty acids." - False (should be two).
• "Unlike triglycerides, phospholipids have nitrogen and phosphorus atoms." - True (triglycerides: C, H, O; phospholipids: C, H, O, N, P).
• "Fatty acids in a phospholipid are called tails." - True (the phosphate - containing part is the head, fatty acid chains are tails).
• But the user's checkmarks might be wrong, but we have to select the true ones.
• Correct true statements:
• Phospholipids are used to build cell membranes.
• Unlike triglycerides, phospholipids have nitrogen and phosphorus atoms.
• Fatty acids in a phospholipid are called tails.
• The statement "A phospholipid is made when one glycerol molecule combines with three fatty acids" is false (phospholipids have two fatty acids, triglycerides have three).

Answer:

• Phospholipids are used to build cell membranes.
• Unlike triglycerides, phospholipids have nitrogen and phosphorus atoms.
• Fatty acids in a phospholipid are called tails.