hollahollaholla
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Please can you explain what the cell cycle is and why it does not occur in some cells from multicellular organisms?
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beyknowles2
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(Original post by hollahollaholla)
Please can you explain what the cell cycle is and why it does not occur in some cells from multicellular organisms?
The cell cycle is the process by which cells multiply. It is split into 3 stages: interphase (including g1, s phase and g2), mitosis (including prophase, metaphase, anaphase and telophase) and cytokenesis.
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FHL
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The cell cycle is a complete cycle of events in the life of an individual diploid cell. It consists of mitosis and interphase.

Interphase — cell carries out normal functions, interval between cell division
· Longest stage of cell cycle
· A cell starts interphase as soon as it is created from cell division
· Period of intense chemical activity

· G1 — first growth phase
o Cell has full size nucleus but there is little cytoplasm
o Protein synthesis starts
o Volume of cytoplasm and № of organelles increases

· S phase
o Cell in restriction point —locked into a sequence of events leading to cell division
o DNA synthesis — cell replicates its DNA

· G2— second growth phase
o Proteins necessary for cell division are synthesised
o Centrioles replicate and energy stores increase


Mitosis—diploid cell divides to form two further diploid cells
Continuous process which is broken into phases for ease of understanding:
· Prophase (pro — early)
· Metaphase (meta — middle)
· Anaphase (ana — apart)
· Telophase — (telo — final)

·Cytokynesis — division of cytoplasm, organelles equally distributed between daughter cells

·Some cells are always in interphase as division ceases once they are mature, e.g. muscle and nerve cells. In these cells the DNA is spread out in the nucleus and genes are being read to produce proteins.
·Some cells undergo mitosis almost straight away like skin cells and the cells of the gut lining.
·Some undergo meiosis to produce gametes.
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hollahollaholla
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(Original post by FHL)
The cell cycle is a complete cycle of events in the life of an individual diploid cell. It consists of mitosis and interphase.

Interphase — cell carries out normal functions, interval between cell division
· Longest stage of cell cycle
· A cell starts interphase as soon as it is created from cell division
· Period of intense chemical activity

· G1 — first growth phase
o Cell has full size nucleus but there is little cytoplasm
o Protein synthesis starts
o Volume of cytoplasm and № of organelles increases

· S phase
o Cell in restriction point —locked into a sequence of events leading to cell division
o DNA synthesis — cell replicates its DNA

· G2— second growth phase
o Proteins necessary for cell division are synthesised
o Centrioles replicate and energy stores increase


Mitosis—diploid cell divides to form two further diploid cells
Continuous process which is broken into phases for ease of understanding:
· Prophase (pro — early)
· Metaphase (meta — middle)
· Anaphase (ana — apart)
· Telophase — (telo — final)

·Cytokynesis — division of cytoplasm, organelles equally distributed between daughter cells

·Some cells are always in interphase as division ceases once they are mature, e.g. muscle and nerve cells. In these cells the DNA is spread out in the nucleus and genes are being read to produce proteins.
·Some cells undergo mitosis almost straight away like skin cells and the cells of the gut lining.
·Some undergo meiosis to produce gametes.
Thank you, but why does it only occur in diploid cells
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