Additional Biology Smart Teach 2: Cells. Animal, Plant and ... - Free Printable

The image presents a comparison table titled "Differences between the cell", which outlines key structural and functional differences among plant cells, animal cells, and bacterial cells. Let's go through the table row by row, explain each difference, and clarify the biological significance.

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🔬 1. Nucleus

- Plant: Has a nucleus → eukaryotic cell
- Animal: Has a nucleus → also eukaryotic
- Bacteria: No nucleus; DNA is in the cytoplasm (chromosomal DNA and plasmids) → prokaryotic

> ✔ Explanation: The presence of a nucleus defines eukaryotes (plants and animals), while bacteria are prokaryotes, meaning they lack a membrane-bound nucleus. Their genetic material floats freely in the cytoplasm.

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🧱 2. Cell Wall

- Plant: Has a cell wall (made of cellulose)
- Animal: No cell wall (only plasma membrane)
- Bacteria: Has a cell wall (made of peptidoglycan)

> ✔ Explanation:
- Plant cell walls provide rigidity and protection.
- Animal cells are flexible due to the absence of a rigid wall.
- Bacterial cell walls are essential for shape and protection, and their peptidoglycan structure is a target for antibiotics like penicillin.

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🌿 3. Chloroplasts

- Plant: Has chloroplasts → site of photosynthesis
- Animal: No chloroplasts
- Bacteria: No chloroplasts

> ✔ Explanation: Only plant cells perform photosynthesis via chloroplasts. Some bacteria can perform photosynthesis too, but without chloroplasts — using specialized membranes instead.

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🔋 4. Mitochondria

- Plant: Has mitochondria
- Animal: Has mitochondria
- Bacteria: No mitochondria

> ✔ Explanation: Mitochondria are the "powerhouses" of the cell, producing ATP via cellular respiration. Bacteria generate energy through other means (like glycolysis or electron transport chains in the plasma membrane).

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🧫 5. Slime coat/capsule

- Plant: No slime coat/capsule
- Animal: No slime coat/capsule
- Bacteria: Has slime coat/capsule

> ✔ Explanation: The capsule helps bacteria adhere to surfaces, resist phagocytosis, and protect against environmental stress. It’s not found in plant or animal cells.

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🪢 6. Pili

- Plant: No pili
- Animal: No pili
- Bacteria: Has pili

> ✔ Explanation: Pili are hair-like structures used for attachment, conjugation (transfer of DNA), and motility in some bacteria. Not present in eukaryotic cells.

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🌀 7. Flagellum

- Plant: No flagellum
- Animal: Has flagellum (in certain cells like sperm)
- Bacteria: Has flagellum

> ✔ Explanation:
- In animals, flagella (e.g., in sperm) are made of microtubules (9+2 arrangement).
- In bacteria, flagella are made of flagellin protein, and rotate to move the cell.
- Most plant cells do not have flagella, though some reproductive cells in algae or moss may.

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📊 Summary Table (for clarity):

| Feature | Plant Cell | Animal Cell | Bacterial Cell |
|------------------------|--------------------|--------------------|----------------------------|
| Nucleus | Yes | Yes | No (prokaryotic) |
| Cell Wall | Yes (cellulose) | No | Yes (peptidoglycan) |
| Chloroplasts | Yes | No | No |
| Mitochondria | Yes | Yes | No |
| Slime coat/capsule | No | No | Yes |
| Pili | No | No | Yes |
| Flagellum | No | Yes (some cells) | Yes |

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✔ Key Takeaways:

- Plant and animal cells are both eukaryotic (have nuclei and organelles), but differ in cell wall, chloroplasts, and flagella.
- Bacterial cells are prokaryotic, lacking a nucleus and membrane-bound organelles.
- Bacteria have unique features like pili, capsules, and different flagella structure.

This table effectively highlights how cellular complexity increases from bacteria to eukaryotes, with adaptations based on function and environment.

Let me know if you'd like a visual diagram or a simplified version!