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Levels of Organization

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Chapter 3 Lesson 2 How do unicellular and multicellular organisms differ? How does cell differentiation lead to the organization within a multicellular organism? – PowerPoint PPT presentation

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Title: Levels of Organization


1
Levels of Organization
  • Chapter 3 Lesson 2

2
Key Concepts
  • How do unicellular and multicellular organisms
    differ?
  • How does cell differentiation lead to the
    organization within a multicellular organism?

3
Unicellular Organisms
  • Unicellular organisms carry out all life
    processes, including responding to the
    environment, getting rid of waste, growing, and
    reproducing, within one cell.

4
Unicellular Organisms
  • A unicellular organism made of one prokaryotic
    cell is called a prokaryote.

A unicellular organism made of one eukaryotic
cell is called a eukaryote.
5
Unicellular Organisms
  • A cell without a membrane-bound nucleus is a
    prokaryotic cell.
  • A eukaryotic cell has a membrane-bound nucleus
    and many other specialized organelles.

6
Multicellular Organisms
  • Multicellular organisms are made of many types of
    eukaryotic cells working together, each with a
    specialized function.

7
Multicellular Organisms
  • All cells in a multicellular organism come from
    one cell a fertilized ovum (egg) a zygote

8
Multicellular Organisms
  • The process by which cells become different types
    of cells is called cell differentiation.

9
Multicellular Organisms
10
Multicellular Organisms
  • Stem cells are unspecialized animal cells that
    are able to develop into many different cell
    types.

11
Multicellular Organisms
  • Plants have unspecialized cells similar to
    animal stem cells.
  • These cells are grouped in areas of a plant
    called meristems.

12
Multicellular Organisms
  • Tissues are groups of similar types of cells in
    multicellular organisms that work together to
    carry out specific tasks.

13
Multicellular Organisms
  • Humans, like most other animals, have four main
    types of tissue
  • Muscle
  • Connective
  • Nervous
  • epithelial

14
Multicellular Organisms
  • The three main types of plant tissue are
  • Dermal
  • Vascular
  • Ground

15
Multicellular Organisms
  • Organs are groups of different tissues working
    together to perform a particular job.

16
Multicellular Organisms
  • Organ systems are groups of different organs that
    work together to complete a series of tasks.

17
Multicellular Organisms
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