chapter 7.1
TRANSCRIPT
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Cell Structure Section 1
Section 1: Introduction to Cells
Preview• Bellringer• Key Ideas• The Discovery of Cells• Looking at Cells• Cell Features• Summary
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Cell Structure Section 1
Bellringer
After viewing the list of items on the board, work with a partner and make two new lists: those items on the list comprised of cells and those items not comprised of cells.
Give a rationale for each answer.
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Cell Structure Section 1
Key Ideas
• How were cells discovered?
• Why does cell shape vary?
• What enables eukaryotes to perform more specialized functions than prokaryotes?
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Cell Structure Section 1
The Discovery of Cells
• ALL living things are made of cells
– Cell Theory
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Cell Structure Section 1
Visual Concept: Cell Theory
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Cell Structure Section 1
Looking at Cells, continued
• All substances that enter or leave a cell must cross the surface of the cell.
• Bigger surface area = better exchange
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Cell Structure Section 1
Cell Features
• All cells have a cell membrane, cytoplasm, ribosomes, and DNA.
• The cell membrane is the outer layer that covers a cell’s surface
• The cytoplasm is the region of the cell within the cell membrane, made of a fluid called the cytosol.
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Cell Structure Section 1
Features of Prokaryotic and Eukaryotic Cells
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Cell Structure Section 1
Cell Features, continued
Prokaryotic Cells
• A prokaryote is an organism made of a single prokaryotic cell.
• Prokaryotic cells do not have a nucleus.
• For millions of years, prokaryotes were the only organisms on Earth.
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Cell Structure Section 1
Cell Features, continued
Features of Eukaryotic Cells
• A eukaryote is an organism made up of one or more eukaryotic cells.
• The DNA of a eukaryotic cell is found in the nucleus.
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Cell Structure Section 1
Visual Concept: Comparing Prokaryotes and Eukaryotes
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Cell Structure Section 1
Comparing Prokaryotes and Eukaryotes