Nails, horns, and hooves contain:
Correct answer: B. Keratin
- A. Chitin
- B. Keratin
- C. Both
- D. None
Explanation
The correct answer is keratin. Keratin is a tough, fibrous protein that forms the structural framework of nails, horns, and hooves. It provides these structures with their strength and resilience. Chitin, on the other hand, is a component of the exoskeletons of arthropods and is not found in nails, horns, or hooves. Therefore, options mentioning chitin or both are incorrect.
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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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