Which of the following is not an example of fibrous protein?

Solution

Chemistry ma’am · 3 steps

Ask what shape the protein takes: long parallel threads, or chains folded up into a ball?

1. Fibrous proteins. The polypeptide chains run side by side and are held together by hydrogen bonds and disulphide bonds. This gives long, fibre-like structures that are usually insoluble in water and do structural work.
2. Globular proteins. The chains coil around and fold into a compact, roughly spherical shape. These are usually soluble in water. Insulin, haemoglobin and albumins are common examples.

   Protein	Where you find it	Shape
   Keratin	hair, wool, nails, silk	fibrous
   Albumin	egg white, blood plasma	globular, water-soluble
   Collagen	tendons, skin, bone	fibrous
   Myosin	muscle fibres	fibrous

3. So. Keratin, collagen and myosin are all fibrous. Albumin is globular, so the answer is (b).

The idea to keep. Structural jobs like hair, tendon and muscle need fibrous proteins, which do not dissolve in water. Proteins dissolved in blood or egg white, like albumin and haemoglobin, are globular.

Answer from the NTA final answer key. Solution by PrepWiser.