Question

select the true statements.
a phospholipid is made when one glycerol molecule combines with three fatty acids.
unlike triglycerides, phospholipids have nitrogen and phosphorus atoms.
phospholipids are used to build cell membranes.
fatty acids in a phospholipid are called tails.

Explanation:

• A phospholipid is made when one glycerol molecule combines with two fatty acids and a phosphate - containing group, not three fatty acids. So the first statement is false.
• Triglycerides have no nitrogen or phosphorus atoms. Phospholipids have a phosphate group (which has phosphorus) and may have nitrogen - containing groups (e.g., choline in phosphatidylcholine). So the second statement is true.
• Phospholipids are the main components of cell membranes, forming a bilayer. So the third statement is true.
• In a phospholipid, the fatty acid chains are non - polar and are called tails, while the phosphate - containing head is polar. So the fourth statement is true.

Answer:

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