Kingdoms and Domains

Structural Diversity

  • based on morphology

The Three Domains

  • Archaea
    • prokaryotic, unicellular
  • Bacteria
    • prokaryotic, unicellular
  • Eukarya
    • eukaryotic, uni or multicellular
  • three-domain system introduced by Carl Woese in 1990

Types of Nutrition

  • Autotroph
    • auto=by itself
    • obtains energy by producing its own food
    • includes phototrophs
    • uses light energy to manufacture food (photosynthesis)
  • Heterotroph
    • obtains energy by intaking nutrients from different sources

Two Major Cell Types

  • unicellular
    • made up of one cell
  • multicellular
    • made up of more than one cell
  • two major cell types are prokaryotic or eukaryotic
Prokaryotic Cells
  • smaller, relatively simple compared to eukaryotic
  • lack membrane bound nucleus
    • DNA is not contained
  • circular DNA
  • no membrane bound organelles
  • prokaryotic cell
Eukaryotic Cells
  • more complex and 1000x larger than prokaryotic
  • membrane bound nucleus
    • DNA is contained inside nucleus
  • linear DNA
  • membrane bound organelles
    • mitochondria
    • eukaryotic cell

Dichotomous Keys

  • identification system
    • uses many two part choices to narrow down a species