Question

Which one of the following is not a protein?

• A. wool
• B. nail
• C. hair
• D. DNA

Answer 1

The correct option is D

DNA

The correct option is D.

Explanation for correct option:

1. DNA is made up of sugar, phosphate, and nitrogenous bases linked together.
2. DNA is a nucleic acid, not a protein, however, it aids in the production of proteins through transcription and translation.
3. On the other hand, keratin, is a fibrous structural protein of hair, nails, horn, hoofs, wool, feathers, and the epithelial cells in the outermost layers of the skin.

Explanation for Incorrect option:

Option A:

1. Wool is a protein as complex quaternary proteins make up the proteins present in wool, hair, and nails.

Option B:

1. Nail is a protein as exoskeletons made composed of complex proteins including wool, hair, and nails.

Option C:

Similarly, hair is a protein.

Final answer: DNA is not a protein.