GCSE Biology, Unit 3, Lesson 5 of 7
Brainlag Plus

Monoclonal antibodies

GCSE Biology, Infection and response, 20 minutes

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How hybridoma cells make one antibody in bulk, and how monoclonal antibodies are used in tests and treatment.

Making them

Monoclonal antibodies are identical antibodies, all made by a clone of one cell, so they all bind to one antigen.

  • inject a mouse with the antigen
  • take lymphocytes that make the matching antibody
  • fuse them with tumour cells to make hybridoma cells: the lymphocyte gives the antibody, the tumour cell the fast division
  • clone a single hybridoma cell, then collect and purify the antibody
  1. One hybridoma cell divides every 24 hours for 10 days
  2. 10 × 24 ÷ 24 = 10 divisions
  3. 1 × 2¹⁰ = 1024 = 1.02 × 10³ cells

The rest of this lesson and its 11 practice questions are in Plus.

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  • 11 exam-style questions, marked as you go, each with a worked solution
  • Anything you get wrong is saved to your flashcards