The Nucleus

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The Nucleus
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• Spherical or Oval Structure
• Usually most predominant structure in a cell
• Most cells have a single nucleus
• Mature RBCs no nuclesu
• Skeletal Muscle multinucleated

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Nuclear Envelope

• Double Membrane
• Lipid Bilayers
• Separates the Nucleus from the Cytoplasm
• Outer membrane is continuous with the Rough ER

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Nuclear Pores

• Openings in the nuclear envelope
• Control movement of substances between the
  nucleus and cytoplasm

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Nucleoli

• Cluster of protein, DNA and RNA
• Found within the nucleus
• Site of ribosome production
• Cells that produce large amounts of protein have
  very predominant nucleoli

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Genes

• Heredity Units
• Control cell structure and direct cell activity
• Arranged in single file on chromosomes
• Humans cells have 46 chromosomes
• Appear as thin threads called chromatin when the
  cell isnt dividing

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Genome

• The total genetic information carried in a cell
  or organism
• Genomics the study of the genome and the
  biological functions of the organism

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Human Genome Project

• Began in 1990 in an effort to sequence all 3.2
  billion (BILLION!) nucleotides of the human
  genome.

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Checkpoint

• Describe the function of the nucleus
• What are the structures that compose the nucleus?
• Do all cells have a single nucleus?