The plant dye Henna imparts orangered colour to skin and hairs due to its reaction with which of the following?
Correct answer: D. Protein and amino acids
- A. Lipids
- B. Carbohydrates
- C. Amino acids
- D. Protein and amino acids
Explanation
Henna contains lawsone, which reacts with proteins and amino groups in keratin of the skin and hair to produce an orange-red stain. Students may choose carbohydrates because henna is a plant product, but the colour-forming interaction is mainly with keratin proteins and their amino acids.
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Proteins are polymers of amino acids joined by peptide bonds, and their function depends on primary, secondary, tertiary and quaternary structure. The topic covers fibrous and globular proteins, enzymes, antibodies, hormones and transport proteins, as well as denaturation by heat or extreme pH.
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