A-LevelBiologyThe mitotic cell cycleMay/June 2025Paper 2 Q57 Marks
There is a global shortage of blood for transfusions. Researchers can culture bone marrow stem cells in the laboratory to manufacture red blood cells for potential use as an artificial blood product. The researchers collect bone marrow stem cells that are present in small quantities in blood, rather than extracting them from bone marrow. • Antibodies, specific to bone marrow stem cells, are attached to tiny magnetic beads. • The beads are added to a sample of blood. • An electric field is applied to immobilise the beads so that the bone marrow stem cells can be collected.
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