Which of the following are the most prominent part of cell membranes in living organisms?
Correct answer: C. Phospholipids
- A. Terpenoids
- B. Waxes
- C. Phospholipids
- D. Acylglycerols
Explanation
Option C is correct. Phospholipids are the most prominent part of cell membranes in living organisms. They make up about 50% of the mass of most cell membranes, and they are essential for the structure and function of the membrane. Phospholipids are amphipathic molecules, which means that they have both hydrophilic (water-loving) and hydrophobic (water-fearing) parts. The hydrophilic head of the phospholipid is made up of a phosphate group and a small group of other atoms. The hydrophobic tails of the phospholipid are made up of two fatty acids. The hydrophilic heads of the phospholipids are attracted to water, while the hydrophobic tails are repelled by water. This causes the phospholipids to spontaneously form bilayers in water. The hydrophilic heads of the phospholipids line up on the outside of the bilayer, where they are exposed to water. The hydrophobic tails of the phospholipids line up on the inside of the bilayer, where they are protected from water.
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