Download The Domains - Denton ISD

Classification of Life
Part 1: The Domains
Classification
• the process of
grouping things
according to
similarities.
Living vs. Non-Living
Living (Biotic)
Non-Living (Abiotic)
• Contain one or more cells
• Are able to:
• Not made of cells
• Unable to grow,
reproduce, or respond to
stimuli.
– Respond to stimuli from its
surroundings
– Use chemicals to
• Grow
• Reproduce
– Maintain stable internal
living conditions
“Need to Know” Vocab Review
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Eukaryotic
Prokaryotic
Unicellular
Multicellular
Autotrophic
Heterotrophic
Extremophile
Decomposer
NEW: Write these down in your notes!
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Sexual Reproduction – The union of two parent cells to
form an offspring
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Asexual Reproduction – Formation of an offspring from a
single parent cell (exact copy).
Classification of Life
– Living things are split into many different
categories called Domains.
– A domain is the largest
group in which living things
are classified. i.e. There are
more organisms grouped in
a domain than a kingdom,
phylum, etc.
– There are 3 Domains of Life
• Archaea
• Bacteria
• Eukarya
Domain Archaea
– The oldest of all life (“archaea” means ancient)
– Prokaryotic cell structure (no nucleus)
– Unicellular and Microscopic
– Reproduce asexually
– No cell parts (organelles)
– Genetic material free-floats in the cell
– Found in extreme environments ( named “extremophiles”) including in
animal digestive systems (methanogens). No other living thing can live in
these environments.
Where to Find Extremophiles…
Extremophiles live in extreme (places where most life
could not exist) conditions.
– These locations include:
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Highly acidic regions
Extreme cold/hot temperature
Hot springs
High radiation
High salt regions
Sulfur vents at the bottom of the oceans
Domain Bacteria
Rod Shaped Bacteria
– Prokaryotic cell structure (no nucleus)
– Microscopic
– Reproduce asexually
– No cell parts (organelles)
Sphere Shaped Bacteria
– Genetic material free-floats in the cell
– Three basic shapes
• Rods
• Spheres (Coccus)
• Spirals
Spiral Shaped Bacteria
What is the difference between
Archea and Bacteria?
• 15 seconds to think…
• 30 seconds to discuss with your neighbor the difference
between archea and bacteria.
• 30 seconds to write the difference in your notebook.
Domain Eukarya
– The word eukaryote (eu- “true”/ karyo“nucleus” /ote- “having to do with”)
describes organisms that have a nucleus
Platypus
– These organisms have a nucleus inside of
their cells
– Some unicellular, some multicellular
Protozoa
Domain Eukarya
– The nucleus of a cell controls the function of a cell and holds all
the genetic material for the cell (similar to what the brain does for a
body)
– You have seen nuclei when we observed plant cells and protists
under the microscope. That’s because plants and protists are
classified in domain Eukarya.
– Organisms in the Domain Eukarya are more complex than the
organisms in the Domain Bacteria and Domain Archaea
– Organisms in the Domain Eukarya include:
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plants
animals
fungi
protists
Agree or Disagree? Amoeba proteus and
Justin Bieber are both classified into domain
Eukarya.
Agree – Go to one side of the room
Disagree – Go to opposite side of the room
Debate!