Answer: Cellulose.
- A Cholesterol
- B Proteins
- C Phospholipids
- D Cellulose
Correct answer: D. Cellulose
Explanation: Cellulose is found in plant cell walls, not in the cell membrane. Membranes contain phospholipids, proteins, and cholesterol.
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.