ninth Grade Biology
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Biology Topics
Characteristics of Living Things
Biomolecules
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Enzymes
All about Cells
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Types of Cells
Cell Organelles
Cell Membrane
Cell Transport
Endosymbiotic Theory
Body Systems
Bacteria and Virus
DNA structure and Functions
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DNA Replication
DNA VS RNA
Cell Cycle
Biological Processes
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Cellular Respirations
Photosynthesis
Evolution/Classification
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Evolution Videos
Ecology
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Ecology Vocabulary
Energy Pyramids
Symbiosis
Succession
Plants
Structure and Function
Annoucements
EOC Review Resources
Eoc Review Symbaloo
EOC Review Game Spin the Wheel
EOC Review Game- Body Systems
EOC Review Game- Genetics
EOC Review Game- Evolution
Animated Biology Tutorials
Amoeba Sisters Biology Videos
The cell membrane
i
s selectively (semi) permeable
:
1.
It protects the cell.
2. It lets things in and out of the cell.
3. Maintains homeostasis (balance).
4. Transmits signals throughout the cell.
Cell membrane- Tutorial
Click here to see "Homeostasis: The King of the cell membrane"