Essential Grade 9 Biology Notes: Unlocking the Secrets of Cells
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Course
Biology
Institution
9th Grade
This comprehensive study guide is your ultimate resource for mastering Cell Biology, a key topic in Grade 9 Science. Perfect for students looking to ace their exams, this document simplifies complex concepts into easy-to-understand notes, making learning efficient and enjoyable.
What’s Include...
WHAT ARE CELLS?
○ Cells are the basic structural and functional units of all living organisms.
○ Every living thing is made up of one or more cells.
Types of Cells:
1. Prokaryotic Cells:
○ Simpler, smaller cells without a true nucleus.
○ Found in unicellular organisms like bacteria.
○ DNA floats freely in the cytoplasm.
○ Examples: Escherichia coli (E. coli), Salmonella.
2. Eukaryotic Cells:
○ Larger, more complex cells with a nucleus.
○ Found in plants, animals, fungi, and protists.
○ Contain many organelles with specialized functions.
○ Examples: Skin cells, nerve cells, leaf cells.
Key Differences Between Prokaryotic and Eukaryotic Cells:
● Prokaryotes: No nucleus, no membrane-bound organelles, usually smaller.
● Eukaryotes: Have a nucleus, membrane-bound organelles, and are larger.
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