In living organisms, the lubricant that provides protection against damage resulting from friction is?
Correct answer: C. Lipid
- A. Water
- B. Carbohydrate
- C. Lipid
- D. Protein
Explanation
Lipids, such as oils and fats, act as natural lubricants in the body. They reduce friction between tissues, protect organs, and help in smooth movement of joints and membranes. Water, carbohydrates, and proteins play other vital roles but do not serve as primary lubricants.
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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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