Answer: Phospholipids.
- A Cellulose
- B Phospholipids
- C Proteins only
- D Starch
Correct answer: B. Phospholipids
Explanation: The cell membrane is a phospholipid bilayer with embedded proteins (fluid mosaic model).
Animal cell structure with major organelles labeled. Image: LadyofHats (Mariana Ruiz), Public Domain, via Wikimedia Commons.
Concept context
Cell theory, prokaryotic vs eukaryotic cells, organelles and their functions. Foundation of all biology.