Biological molecules- Proteins

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The specific function of a protein is determined by its shape. The shape of a protein is basically the specific sequence of amino acid. Enzymes are very important biological molecules as they perform a variety of functions

  • Catalysing chemical reaction as enzymes
  • Transporting materials around the cell membrane as carrier proteins.
  • They help in defending the body from diseases.
  • Structural proteins support cells and tissues.
  • Hormones transmit information.
  • Haemoglobin carries oxygen which is a protein with a quaternary structure.

They are made up of carbon, hydrogen and oxygen. However, they are identified with their nitrogen and maybe sulphur and phosphorus chemical constituents.

Amino acids

Most amino acids have similar structure. They have a -NH2 group on one end and a -COOH group on the other. The R group is different for different amino acids. 

Peptide bond

Amino acids are sub units that join together to form a polypeptide chain. In a condensation reaction the amine group of one amino acid joins with the carboxyl group of another amino acid. During the reaction…


Bethany Cunningham


Awesome pictures!

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