Cell Division Occurs in All Organisms

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Cell Division Occurs in All Organisms

• Science
• Miss Curds Class

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Cell Division is involved in many functions

• Unicellular organisms reproduce through cell
  division
• Multicellular organisms cell division is
  involved in growth, development repair,
  reproduction
• How does cell division differ for unicellular and
  multicellular organisms?

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The genetic material of eukaryotic cells is
organized in chromosomes

• When a cell divides into two new cells, each cell
  receives a full set of genetic material.
• The genetic material in cells is contained in DNA
  molecules.
• DNA deoxyribonucleic acid
• DNA is a chemical that contains information for
  an organisms growth and function
• What is DNA and what purpose does it serve?

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DNAs Discovery

• Watson and Crick built a DNA model in 1953
• They showed that DNA is
• made of two strands of
• molecules joined in a structure
• that resembles a twisted
• ladder or double helix.
• How was DNA discovered?

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Eukaryotic Cells

• In Eukaryotic cells, the cells DNA is found in
  the nucleus
• DNA is wrapped around a protein core and
  compacted into structures called chromosomes.
• Chromatids two identical structures in a
  chromosome
• Centromere connect chromatids
• Humans have 46 chromosomes
• Describe how DNA is organized inside the Nucleus

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Cell division is involved in growth, development,
repair

• Through cell division, a single cell becomes two
  cells, two cells become four, and so on.
• Cell division is always occurring.
• As the cells divide what happens to some of them?
• They specializethis is what makes organisms
  different
• Cells have different life spans Throat cells
  last 2-3 days (about 60 hours)
• You lose about 40,000 skin cells every minute
• At adulthood, you will have about 100 trillion
  cells
• Describe the purpose of cell division

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