Silk is a natural protein fiber produced by the larvae of certain specific insects like caterpillars of moths. "This finding could lead to the development of processing methods resulting in new high-strength and high-performance materials used for biomedical … Which of the following makes silk fibres – (a) Larva (b) Adult silk moth (c) Pupa (d) None of the above iii. secrete fibres made of protein (fibrin) with their special silk glands. About 550 AD Byzantine Emperor Justinian sent two monks on a mission of industrial espionage. Fill in the blanks in the following statements. The most commonly used silk is mulberry silk as silk moth feed on mulberry leaves. This liquid is mostly made up of a type of protein called fibroin. The answer lies in how they control the silk protein solubility and structural organization in their glands. However, the secret of silk production did not reach the west (Europe) until 552 AD. These silk-producing glands secrete a clear liquid that hardens into a thin silk thread when it comes into contact with air. It is mainly composed of fibroin. i. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon ii. Fibroin consists of the sequence of long-chain amino acids Gly-Ser-Gly-Ala-Gly-Ala. The silk fiber protein is synthesized by silk . The correct option is C. Silkworms secrete fibre made of GC Fibres Polymers Silkworms secrete fibre made of. There are … liquid silk during the spinning, it ... made up of two brins. Subsequently, it is converted into . After this, the caterpillar completely covers itself by the fibre and turns into pupa. Fat and cellulose are not present in silk. The silkworm has two modified salivary glands near its lower jaw called sericteries. The silk thread is obtained from the cocoons of silk moth. The silkworms secrete an excellent filament made of fibroin protein from 2 glands on its head, hardening after exposure to air, and becoming silk fibers. The most common variety of silk is – (a) Tussar silk (b) Kota silk (c) Mulberry silk (d) Mooga silk iv. India was growing the silkworm also shortly after 300 AD. Solution: (c) Salivary gland of the silkworm secretes fibre made up of protein sericin and fibroin. The chief wife of the first Emperor of China is credited with accidentally discovering how to reel silk when a silkworm cocoon dropped from a tree into her cup of hot tea. During all these times they secrete fibre made up of protein which when comes in contact of air and it hardens to become a silk fibre. Through the head’s transition from side to side in the cycle of a figure of eight, the silkworm totally covers itself, forming the cocoon. Soon, the caterpillar covers itself with silk and forms a cocoon. The secret to silk production may have reached Korea around 200 BC. These silk fibres are obtained from cocoon stage. Furthermore, it forms beta-keratin. Bioengineers have discovered how spiders and silkworms are able to spin webs and cocoons made of incredibly strong fibers. Fibroin is … The mulberry silkworms produce these two proteins in its cocoon. This covering is known as the cocoon. (a) _____ and _____ fibres are obtained from animals. Very Short Answer Type Questions. Silk protein consists of sericin and fibroin mainly. Sericulture, the practice of making silk and raising silkworms (and your vocab word for the day) began in China around 3000 BCE. Nylon is a synthetic fibre. Silkworms secrete fibre made of (a) fat (b) cellulose (c) protein (d) nylon. silk fibres. Silk is made up of protein fibre, namely, 70% of fibroin (the filament) and 30% of sericin. Question 11. fat; cellulose; protein; nylon; Answer. When the silkworms secrete t he . 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silkworm secrete fibre made of protein

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