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Biomolecules in the Cell > Proteins

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Estimated time: 6 minutes
CBSE: Class 12
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.

CBSE: Class 12
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.

CBSE: Class 12

Definition: Proteins

Proteins are complex polyamides formed from amino acids. They are essential for the proper growth and maintenance of the body. They have many peptide (-CO–NH )bonds.

CBSE: Class 12
Maharashtra State Board: Class 12

Key Points: Biomolecules in the Cell > Proteins

  • Proteins are polymers of amino acids (polypeptides) in which amino acids are linked by peptide bonds.
  • There are 20 types of amino acids, so proteins are heteropolymers (not homopolymers).
  • Amino acids are of two types: essential (must be obtained from diet) and non-essential (can be synthesised in the body).
  • Proteins are high molecular weight biomolecules (polyamides) made of α-amino acids with a general structure R-CH(NH₂)-COOH.
  • Proteins perform various functions such as enzymatic activity, transport, hormonal regulation, immunity, and sensory reception.
  • Proteins are of two main types: fibrous proteins (insoluble, structural, e.g., keratin) and globular proteins (soluble, functional, e.g., enzymes, insulin).
  • Collagen is the most abundant protein in animals, while RuBisCO is the most abundant enzyme in the biosphere.

Video Tutorials

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Shaalaa.com | Biomolecules part 20 (Vitamins)

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