All of the following are common molecules in membranes of all type of cells except:
Correct answer: B. Cholesterol
- A. Globular proteins
- B. Cholesterol
- C. Traces of carbohydrates
- D. Phospholipid
Explanation
Cholesterol is a type of lipid that is a major component of eukaryotic cell membranes. It helps maintain membrane fluidity and stability by interacting with phospholipids. Cholesterol is present in large amounts (around 20-40 mol%) in eukaryotic plasma membranes, but it is universally absent in the membranes of prokaryotes. Therefore, the correct option is cholesterol as it is not present in all types of cell membranes.
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Animal, plant, prokaryotic and eukaryotic cells are compared through their membranes, cell walls, nuclei and cytoplasmic organelles. The work includes the structures and functions of mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, Golgi apparatus and lysosomes, as well as chromosome organization and the distinction between chromatin and chromosomes.
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