In living organisms, the lubricant which provides protection against damage resulting from friction is?
Correct answer: A. Water
- A. Water
- B. Carbohydrates
- C. Lipids
- D. Proteins
Explanation
Water is essential for life and participates in numerous biological processes, including digestion, circulation, and chemical reactions. Beyond these roles, it primarily acts as a lubricant in the body, cushioning joints, facilitating smooth movement of tissues, and reducing friction between organs. In structures such as the eyes, mouth, and joints, water ensures proper function and prevents wear or damage. Its lubricating property is therefore crucial for maintaining tissue integrity and overall physiological efficiency.
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About Biological Molecules
The chapter covers water's polarity and biological roles, carbohydrates, lipids, proteins and nucleic acids, including their monomers, bonds, structures and functions. It also distinguishes RNA from DNA and explains conjugated molecules such as glycoproteins, glycolipids and nucleoproteins, which combine organic molecules with a non-protein component.
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