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Question Bank [2022] — Chemistry STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceChemistryQuestion Bank [2022]2 Marks
Question
Explain globular and fibrous proteins with example.
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Answer

Globular proteins:

  1. Molecules of globular proteins have a spherical shape. This shape results from coiling around the polypeptide chain of the protein.
  2. Globular proteins are usually soluble in water.
    For example: Insulin, egg albumin, serum albumin, legumelin (protein in pulses)

Fibrous proteins:

  1. Molecules of fibrous proteins have elongated rod-like shape. This shape is the result of holding the polypeptide chains of protein parallel to each other.
  2. Hydrogen bonds and disulfide bonds are responsible for this shape.
  3. Fibrous proteins are insoluble in water.
    For example: Keratin (present in hair, nail, wool), myosin (protein of muscles).

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