OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

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Where can stem cells be found in adults?

In the brain
In bone marrow
In the liver
In skin tissue

The correct answer is: In bone marrow

Stem cells in adults can be primarily found in bone marrow. These adult stem cells, often referred to as hematopoietic stem cells, are crucial for the production of blood cells, including red blood cells, white blood cells, and platelets. The bone marrow serves as a rich reservoir for these stem cells, allowing for the ongoing renewal and repair of blood and immune system components throughout a person's life. While it is true that other types of stem cells can be found in various adult tissues, such as neural stem cells in the brain or mesenchymal stem cells in other tissues, the most well-known and extensively studied location of adult stem cells is indeed the bone marrow. Other tissues like the liver and skin contain progenitor cells that have some regenerative capabilities, yet they do not have the same broad differentiation potential characteristic of stem cells found in bone marrow.