Unicellular and Multicellular Organisms

Unicellular Organisms

• Definition: Organisms with only one cell.
• Types: Can be both eukaryotic and prokaryotic.
  • Prokaryotic Examples:
    • Bacteria: Lack a nucleus and membrane-bound organelles.
  • Eukaryotic Examples:
    • Euglena: Have a nucleus and membrane-bound organelles.
    • Paramecium: Have a nucleus and membrane-bound organelles.
• Environments: Some live in extreme environments (e.g., hot springs, stomach of a cow).

Multicellular Organisms

• Definition: Organisms with two or more cells.
• Characteristics: All are eukaryotic.
• Examples: Frogs, dogs, humans.
• Development: Start as a single cell, then cells specialize into different types.
  • Process:
    • Cells become tissues
    • Tissues form organs
    • Organs are organized into organ systems
    • Organ systems create organisms

Summary

• Unicellular: One cell.
• Multicellular: Two or more cells.

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