Question

a phospholipid molecule has two fatty acid molecules, one glycerol molecule, and a molecule called a phosphate group. the phosphate group is referred to as the \head,\ and the fatty acid chains are the \tails.\ the model shows the chemical structure of a phospholipid. select the true statements. unlike triglycerides, phospholipids have nitrogen and phosphorus atoms. fatty acids in a phospholipid are called tails. phospholipids are used to build cell membranes. a phospholipid is made when one glycerol molecule combines with three fatty acids.

Explanation:

1. Statement 1: Triglycerides have glycerol and three fatty acids (elements C, H, O). Phospholipids have a phosphate group (with P) and often a nitrogen - containing group (like choline), so they have N and P unlike triglycerides. This is true.
2. Statement 2: From the given description, the fatty acid chains are referred to as the "tails" of the phospholipid. This matches the statement, so it is true.
3. Statement 3: Phospholipids are the main component of cell membranes, forming the lipid bilayer. So this statement is true.
4. Statement 4: A phospholipid has one glycerol, two fatty acids, and a phosphate - containing group. Triglycerides have one glycerol and three fatty acids. So this statement is false (the checked option here is incorrect, but we are identifying true statements among the given ones with their checks; however, based on knowledge, this statement is false, but in the context of the provided checked options, we analyze each):

• For the first three statements (the first three checked ones), based on biological (Biology, a subfield of Natural Science) knowledge about phospholipids:
• The first statement is true as phospholipids have N (in groups like choline) and P (in phosphate) while triglycerides (C, H, O only).
• The second statement is true as per the given description ("the fatty acid chains are the 'tails'").
• The third statement is true as phospholipids are the major component of cell membranes.
• The fourth statement is false (a phospholipid has two fatty acids, not three; three fatty acids with glycerol make a triglyceride). But among the given checked statements, the first three are true (assuming the fourth is a mistake in the check, but based on the question to select true statements):

Answer:

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