Bbc Bitesize Higher Biology Osmosis Coursework

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March 4, 2018 - Uncategorized - 0 Comments

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When cells express specific genes that characterise a certain type of cell we say that a cell has become differentiated.

Once a cell becomes differentiated it only expresses the genes that produce the proteins characteristic for that type of cell.

Differentiated cells are important in a multi-cellular organism because they are able to perform a specialised function in the body. However, specialisation comes at a cost.

The cost is that the differentiated cells often lose the ability to make new copies of themselves.

Multi-cellular organisms must therefore retain some unspecialised cells that can replenish cells when needed. These unspecialised cells are called stem cells.

Stem cells

Stem cells are cells in animals that can continuously undergo cell division. There are two types of stem cell:

  • Embryonic stem cells: These are found in an early embryo. These cells are able to divide continuously and give rise to all types of cell. They are important for growth. Some people find the use of embryonic stem cells ethically unacceptable because it involves the destruction of an early embryo.
  • Tissue (adult) stem cells: These are found in a mature organism. Their function is to replenish differentiated cells that need to be replaced. Tissue stem cells can only give rise to a more limited range of cell types, eg red bone marrow stem cells produce various blood cell types.

Stem cells have already been used therapeutically to repair damaged or diseased organs, for example bone marrow transplants, corneal transplants, and skin grafts for burns.

Stem cells have also been used as model cells to study how diseases develop or for drug testing.


Meristems are regions of unspecialised cells in plants that are capable of cell division. They are only found is certain parts of the plant such as the tip of roots and shoots and in between the xylem and phloem.

Meristems make unspecialised cells that have the potential to become any type of specialised cell.

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