What is the property of the part of a cell membrane that is in contact with the external and internal environment?
Correct answer: B. Hydrophilic
- A. Hydrophobic
- B. Hydrophilic
- C. Neutral
- D. Both Options A and B are correct
Explanation
The plasma membrane consists of a lipid bilayer associated with proteins. The polar phospholipid heads are hydrophilic and are directed outward, while the non-polar tails are hydrophobic and are directed inward, facing each other. Therefore, the hydrophilic ends are in contact with both the external extracellular environment and the internal environment of the cell.
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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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