Question

Silk fibres are made up of ________.

• A. Fibroin
• B. Carbohydrates
• C. Proteins
• D. Fats

Answer 1

The correct option is A

Fibroin

The correct option is A.

Explanation of the correct option:

1. Fibroin is an insoluble protein present in silk produced by numerous insects.
2. Silk in its raw state consists of two main proteins, sericin, and fibroin.
3. Silk fibroin is a β-keratin related to proteins that form hair, skin, nails, and connective tissues.
4. The silkworm produces fibroin with three chains, light, heavy, and the glycoprotein P25.
5. Silk fibroin has been known to induce wound healing by increasing cell proliferation and growth and migrating various types of cells which are involved in different stages of the wound healing process.
6. Hence, silk fibers are made up of Fibroin.

Explanation of the incorrect option:

Option B:

1. Carbohydrates, or carbs, are sugar molecules. Along with proteins and fats, carbohydrates are one of the three main nutrients found in foods and drinks.
2. Silk fiber obtained from silkmoth is not Carbohydrate. Silk fibers are not made up of carbohydrates.

Option C:

1. Silk fiber obtained from insects like the silkworm is a natural protein i.e., fibroin.
2. Hence, fibroin fits best than protein. Silk fibers are made up of a protein that is called fibroin.

Option D:

1. Fats are a type of nutrient that we get from our diet. It is essential to eat some fats, though it is also harmful to eat too much.
2. Silk fiber obtained from silk moths is not Fat. Silk fibers are not made up of fats.

Final answer: Silk fibers are made up of fibroin.