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Cells
Living Environment
Objectives…I can…
• Explain the contributions that led to the
development of the cell theory.
• Describe the levels of organization within
organisms.
• Describe the structure and function of cell
organelles.
• Understand the distinguishing
characteristics between animal and plant
cells.
Two Types of Cells
• A. prokaryotic cells – very small, no
nucleus, have few organelles
– Ex: bacteria
• B. eukaryotic cells – have a nucleus and
organelles that carry out specific functions
in the cell
• Ex: plant, animal, fungi cells
CFU
• What are two differences between
prokaryotic and eukaryotic cells?
• Give an example of each type of cell.
Cell History
• A. 1665 – Robert Hooke observes cork
and uses the term “cell”
• 1674 – Anton van Leeuwenhoek – makes
a single lens microscope
• 1838 – Matthias Schleiden – all plants are
made of cells
• 1839 – Theodor Schwann – all living
things are made of cells
Cell Theory
• A. Cells are the basic unit of life.
• B. All organisms are made of one or more
cells.
• C. All cells come from existing cells.
Levels of Organization
Multicellular Organisms
Organism
Organ System
Organ
Tissue
Cell
• Tissue-group of similar cells that perform a
particular function.
• Organ-groups of tissues working together.
Plant Cells vs. Animal Cells
Plant Cells
Animal Cells
Animal and Plant Cells
CFU
• Place the following terms in order from
simplest to most complex:
organ, cell, organism, organ system, tissue