Introduction to Cells - PowerPoint PPT Presentation

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Introduction to Cells

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Introduction to Cells The Cell Theory All living things are composed of cells. Cells are the basic units of structure and function in living things. – PowerPoint PPT presentation

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Title: Introduction to Cells


1
Introduction to Cells
2
The Cell Theory
  • All living things are composed of cells.
  • Cells are the basic units of structure and
    function in living things.
  • New cells are produced from existing cells.

3
Levels of Organization
  • Put these terms in order from smallest to
    largest

Organism
Molecule
Cell
Organ
Organ System
Tissue
4
Give an example of each level
  • Molecule
  • Cell
  • Tissue
  • Organ
  • Organ System
  • Organism

5
What do you notice?
6
Types of Cells
  • Two kinds of cells depending on whether they have
    a nucleus

Eukaryote
Prokaryote
Genetic material
7
Prokaryotes
  • Usually small and simple
  • Genetic material (DNA) is not contained in a
    nucleus
  • The ONLY prokaryotes in the world are BACTERIA.

8
Prokaryotic Cells
9
Eukaryotes
  • Larger and more complex than prokaryotes.
  • May be unicellular like an amoeba or
    multicellular like a plant
  • Contain dozens of specialized structures called
    organelles.
  • Examples protists, fungi, plants and animals.

10
Eukaryotic cells
11
Eukaryotic cell structure
  • Two major parts
  • Nucleus
  • Cytoplasm-portion of the cell outside the nucleus
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