Cell division, diversity and organisation

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  • Created by: Nicole
  • Created on: 18-02-13 09:46
What is the cell cycle
Process that all body cells from multicellular organisms use to grow and divide.
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What stage takes up the majority of the cell cycle
Interphase
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What happens in interphase?
Growth stage where organelles and DNA are replicated. Production of ATP and protein synthesis. Most importantly where DNA is checked for errors.
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What happens in propase?
Chromosomes condense and coil. Centrioles move outwards and spindle forms. Nuclear envelope breaks down.
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What happens in metaphase?
Chromosomes line up along middle of cell. Spindle attached to centromere
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What happens in anaphase?
Centromere divides seperation sister chromatids. Pulled by spindle contracting. Goes to opposite poles of the cell.
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Telophase
Chromatid reach opposite poles. Uncoil and become chromosomes. Nuclear envelope reforms around two nuclei. Cytoplasm divides for animal cell where for plant cell cell wall plate forms.
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Staining chromsomes.
Use acetic orcene to identify what point of cell division particular cells are in.
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Product and use of mitosis.
Asexual reproduction (diploid), growth of tissue/cell, repair of tissue/cell.
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Product and use of meiosis.
Sexual reproduction (haploid), growth of cell/tissue, repair of tissue/cell.
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What happens during budding.
A bud forms at surface of cell, cell goes through interphase. Organelles and DNA material travels into bud. Bud separates and is genertically identical.
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What are stem cell?
Unspecialised cells which can differentiate into any type of cell. Found in early embryo.
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Where are stem cells found in humans?
Bone marrow. Contain stem cells for blood vessels.
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Where are stem cells found in plants?
Cambium which can differentiate into xylem or phloem.
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How are neutrophils specialised?
Flexible shape to engulf foreign particles. Lysosomes to break down engulfed particle.
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How are erythocytes specialised?
Biconcave shape for large surface area. No nucleus to pack haemoglobin in.
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How are Epithelial cell specialised?
Large surface area. Thin (squamous) . Move particles by tiny hair-like cilia.
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How are sperm cells specialised?
Flagellum so can swim. Mitochondria for energy. Acrosome to penetrate egg surface.
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Card 2

Front

What stage takes up the majority of the cell cycle

Back

Interphase

Card 3

Front

What happens in interphase?

Back

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Card 4

Front

What happens in propase?

Back

Preview of the front of card 4

Card 5

Front

What happens in metaphase?

Back

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