Bio Lesson 4 - Cell Theory and Structure

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Last updated 9:24 AM on 7/26/26
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11 Terms

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Cell Theory

  1. All living things are made of cells

  2. The cell is the fundamental unit of all life

  3. Cells must come from the pre-existing cells

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Matthias Schleiden

Concluded that all plants are made up of cells

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Theodor Schwann

Concluded that all animals are made up of cells

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Rudolf Virchow

Stated that all cells must come from other cells

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Cell membrane

  • PRIMARY FUNCTION: Separates the inside from the outside

  • Semi-permeable membrane

  • Composed of a phospholipid bilayer

<ul><li><p>PRIMARY FUNCTION: Separates the inside from the outside</p></li><li><p>Semi-permeable membrane</p></li><li><p>Composed of a <strong>phospholipid bilayer</strong></p></li></ul><p></p>
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<p>Nucleus</p>

Nucleus

  • Oversees functions through DNA

  • Three main parts:

    • Nucleolus

    • Nuclear Envelope

    • Nuclear Pores

<ul><li><p>Oversees functions through DNA</p></li><li><p>Three main parts:</p><ul><li><p><strong>Nucleolus</strong></p></li><li><p><strong>Nuclear Envelope</strong></p></li><li><p><strong>Nuclear Pores</strong></p></li></ul></li></ul><p></p>
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Nucleolus

Area of densely packed DNA

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Nuclear Envelope

Double membrane that protects the DNA

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Nuclear Pores

Pores or holes that allow passage of specific molecules

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Endosymbiotic Theory

Proposed by Lynn Margulis

States that the mitochondria and chloroplasts developed from free-living cells that were engulfed by early eukaryotes

<p>Proposed by Lynn Margulis</p><p>States that the <strong>mitochondria </strong>and <strong>chloroplasts </strong>developed from <strong>free-living cells </strong>that were engulfed by early eukaryotes</p>