Keratin is an example of a fibrous protein present in:
Correct answer: D. Nails and hair
- A. Blood
- B. Muscles
- C. Bones
- D. Nails and hair
Explanation
Keratin is a type of fibrous protein that is key to the structure of hair, nails, and the outer layer of skin. It provides strength and resilience to these tissues. In contrast, blood contains proteins like hemoglobin and albumin, muscles primarily contain actin and myosin, and bones are made up of collagen and minerals. Therefore, the correct answer is that keratin is found in nails and hair.
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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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