GCSE Biology Revision — Stem Cells
Revise Stem Cells for GCSE Biology with a topic explanation, worked example and common mistakes. Check the board notes for specification differences.
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What is Stem Cells?
Stem cells are undifferentiated cells with the potential to develop into various specialised cell types. Embryonic stem cells are found in early human embryos and can differentiate into any type of cell. Adult stem cells are found in certain tissues like bone marrow and can only differentiate into a limited range of cell types.
Board notes: Covered by all major boards (AQA, Edexcel, OCR). The potential uses and ethical considerations of embryonic and adult stem cells are key areas of assessment.
Step-by-step explanationWorked examples
Worked example
A patient has a faulty pancreas and cannot produce insulin. Scientists could potentially use stem cells, treat them with specific growth factors to differentiate them into insulin-producing pancreatic cells, and then transplant these new cells into the patient to treat their diabetes. This is an example of therapeutic cloning.
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Common mistakes
- 1Thinking all stem cells are the same. Embryonic stem cells are pluripotent (can become any cell type), while adult stem cells are multipotent (can become a limited range of cell types).
- 2Ignoring the ethical issues. The use of embryonic stem cells is controversial because it involves the destruction of an embryo, which some people consider to be a potential life.
- 3Confusing stem cells with specialised cells. Stem cells are unspecialised; their value lies in their potential to become specialised cells for therapeutic use.
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Frequently asked questions
What are the benefits of using stem cells in medicine?
Stem cells have the potential to treat a wide range of conditions, including paralysis, diabetes, and heart disease, by replacing damaged or diseased cells with healthy new ones.
Where are adult stem cells found?
Adult stem cells are found in various tissues in the body, such as bone marrow, skin, and the brain. They are involved in the body's natural repair and replacement processes.