Question

while the lipid bilayer makes up the majority of the cell membrane, the cell membrane is not made of only phospholipids. a variety of molecules are embedded in the lipid bilayer. these molecules can move around among the phospholipids. for this reason, scientists often describe the cell membrane as a fluid mosaic. this diagram shows a fluid mosaic model of the cell membrane. what types of molecules make up the cell membrane? select all that apply. lipids proteins carbohydrates nucleic acids

Explanation:

1. From the text and diagram: The cell membrane has a lipid bilayer (so lipids are present), integral/peripheral proteins (so proteins are present), and carbohydrate groups (so carbohydrates are present).
2. Nucleic acids (like DNA/RNA) are not part of the cell membrane structure as per the given info and cell biology knowledge. So the incorrect selection here is "nucleic acids", and the correct ones are lipids, proteins, carbohydrates. But since the question is about identifying the correct molecules (and the checkmarks in the image might have an error for nucleic acids), we analyze: Lipids (phospholipids, cholesterol) are in the membrane. Proteins (integral, peripheral) are embedded. Carbohydrates (as groups) are attached. Nucleic acids are not components of the cell membrane. So the correct molecules are lipids, proteins, carbohydrates (nucleic acids is incorrect). But if we correct the checkmarks:

• Lipids: Correct (phospholipid bilayer, cholesterol).
• Proteins: Correct (integral, peripheral).
• Carbohydrates: Correct (carbohydrate groups).
• Nucleic acids: Incorrect (not part of cell membrane structure).

Answer:

The correct options (molecules making up the cell membrane) are:

• lipids (A. lipids)
• proteins (B. proteins)
• carbohydrates (C. carbohydrates)

(Note: "nucleic acids" is incorrect as they are not part of the cell membrane structure.)