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Proteins can be used
A. As food
B. In textiles
C. An enzymes
D. All of these

Answer
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Hint: Protein is a naturally occurring and extremely complex substance that consists of amino acid residues. Proteins are present in all living organisms. Protein is the most important essential constituent of diet because protein is the main food for body building.

Complete Step by Step Solution:
Proteins do most of the work in cells and they are required for the function, structure, and regulation of the tissues and organs of the body. Protein present in muscles of the body.

Protein is the essential constituent of many foods. Protein is present in milk, meat, fish, poultry, eggs etc animal based foods. Protein again present in vegetables, fruit, beans, nuts, grains, seeds etc plant based foods. We consumed protein which is essential for our body from these plant and animal based foods.

Two main types of protein fibres are used in the textile industry mostly are wool and silk. The major protein fibres are wool, silk, mohair, cashmere, llama, alpaca, and vicuna. These protein fibres are widely used in textile industries.

Enzymes are the type of proteins that consist of amino acids linked together in one or more polypeptide chains. These protein based enzymes are used in various biological functions of our body.
Thus the correct option is D.

Note: Protein is present in hormones, enzymes etc. Again it is the main constituent of nails, skin, hair and other body tissues. It is the essential constituent of our diet. It performs many biological functions of our body.