Paper 3 9 mark questions

Question 1

Explain the role of proteins in humans

Answer 1

• Proteins are made up of amino acids joined by polypeptide chains
• Proteins are vital in the immune system
  such as antibodies:
  Antibodies bind to specific foreign particles such as viruses and bacteria to help protect the body.
• ## Proteins are also found in muscle contraction such as myosin, tropsin.