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Karnataka Board PUCPUC Science 2nd PUC Class 12

Biomolecules in the Cell > Proteins

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Estimated time: 5 minutes
Maharashtra State Board: Class 12

Definition: Amino Acid

Bifunctional organic compounds containing a carboxylic and an amino group either at the same carbon atom or at nearby carbon atoms are called amino acids.

Maharashtra State Board: Class 12

Definition: a-Amino Acids

Chemically, proteins are polyamides, which are high molecular weight polymers of the monomer units called \[\alpha\]-amino acids.

Maharashtra State Board: Class 12

Key Points: Biomolecules in the Cell > Proteins

  • Origin of the name: The word "protein" is derived from the Greek word 'proteios', meaning "primary" or "of prime importance", reflecting proteins' essential role in living organisms.
  • Chemical nature: Proteins are polyamides — high molecular weight polymers made up of monomer units called α-amino acids (general formula: RCH(NH₂)COOH).
  • Nutritional sources: Key dietary sources of protein include milk, pulses, nuts, fish, and meat.
  • Fibrous proteins have thread-like structures where polypeptide chains run parallel, held by hydrogen and disulphide bonds; they are insoluble in water — e.g., Keratin (hair, skin, nails) and Myosin (muscles).
  • Globular proteins have a spherical shape where polypeptide chains coil around; they are soluble in water — e.g., Insulin, Egg albumin, and Legumelin.

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Biomolecules part 20 (Vitamins) [00:05:52]
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