Prokaryotic and Eukaryotic Cell Structure Worksheet illustrating the differences between bacterial and eukaryotic cells.

Let's solve Task 1 of the worksheet step by step.

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🔍 Step 1: Identify the Cell Types

From the two diagrams:

- Left cell:
- Has a nucleoid region (not a nucleus), no membrane-bound organelles, and a simple structure.
- Size: 0.1–10 μm → typical for prokaryotes.
- This is a prokaryotic cell.

- Right cell:
- Has a true nucleus (with nucleolus), many membrane-bound organelles (like mitochondria, ER, Golgi), and is larger (10–100 μm).
- This is a eukaryotic cell.

So we label:
- Prokaryotic CELL
- Eukaryotic CELL

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✔ Step 2: Match Characteristics to Cell Type

Now, fill in the table by placing each characteristic under the correct cell type: Prokaryote or Eukaryote.

We’ll go through each line and assign it appropriately.

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| Characteristic | Prokaryote | Eukaryote |
|----------------|------------|-----------|
| Bacteria and cyanobacteria | ✔ | |
| All other cells | | ✔ |
| No nuclear membrane | ✔ | |
| True nuclear membrane | | ✔ |
| Lack membrane-bound organelles | ✔ | |
| Possess subcellular organelles (membrane-bound) | | ✔ |
| Evolve from much smaller prokaryotic cells | | ✔ |
| Contain DNA | ✔ | ✔ |
| DNA is visible as a long irregularly shaped molecule | ✔ | |
| DNA is packaged together with special proteins, called chromosomes | | ✔ |
| Specific number of chromosomes | | ✔ |
| Cell membrane, cytoplasm and various organelles | ✔ | ✔ |
| Have ribosomes and make proteins | ✔ | ✔ |

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📝 Explanation of Each Entry

1. Bacteria and cyanobacteria → Prokaryote
→ These are classic examples of prokaryotes.

2. All other cells → Eukaryote
→ Includes plants, animals, fungi, protists.

3. No nuclear membrane → Prokaryote
→ Prokaryotes have a nucleoid region, not a nucleus with a membrane.

4. True nuclear membrane → Eukaryote
→ Eukaryotes have a nuclear envelope surrounding the nucleus.

5. Lack membrane-bound organelles → Prokaryote
→ They have ribosomes but no mitochondria, ER, etc.

6. Possess subcellular organelles → Eukaryote
→ Organelles like mitochondria, lysosomes, Golgi apparatus are membrane-bound and found only in eukaryotes.

7. Evolve from much smaller prokaryotic cells → Eukaryote
→ The endosymbiotic theory suggests eukaryotes evolved from prokaryotes.

8. Contain DNA → Both
→ All living cells contain DNA.

9. DNA is visible as a long irregularly shaped molecule → Prokaryote
→ In prokaryotes, DNA floats freely in the nucleoid region, unorganized.

10. DNA is packaged together with special proteins, called chromosomes → Eukaryote
→ In eukaryotes, DNA is wrapped around histones to form chromatin/chromosomes.

11. Specific number of chromosomes → Eukaryote
→ Eukaryotes have a defined diploid/haploid chromosome number (e.g., humans: 46). Prokaryotes usually have one circular chromosome.

12. Cell membrane, cytoplasm and various organelles → Both
→ Both types have a plasma membrane and cytoplasm. "Various organelles" applies more to eukaryotes, but since prokaryotes have some structures (like ribosomes), it’s acceptable for both.

13. Have ribosomes and make proteins → Both
→ Ribosomes are present in all cells; protein synthesis occurs in both.

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✔ Final Answer Table

> PROKARYOTIC CELL — EUKARYOTIC CELL

| Characteristic | Prokaryote | Eukaryote |
|----------------|------------|-----------|
| Bacteria and cyanobacteria | ✔ | |
| All other cells | | ✔ |
| No nuclear membrane | ✔ | |
| True nuclear membrane | | ✔ |
| Lack membrane-bound organelles | ✔ | |
| Possess subcellular organelles | | ✔ |
| Evolve from much smaller prokaryotic cells | | ✔ |
| Contain DNA | ✔ | ✔ |
| DNA is visible as a long irregularly shaped molecule | ✔ | |
| DNA is packaged together with special proteins, called chromosomes | | ✔ |
| Specific number of chromosomes | | ✔ |
| Cell membrane, cytoplasm and various organelles | ✔ | ✔ |
| Have ribosomes and make proteins | ✔ | ✔ |

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💡 Summary

- Prokaryotes are simpler, lack a nucleus and membrane-bound organelles.
- Eukaryotes are more complex, with a nucleus and organelles.
- Both share basic features: DNA, ribosomes, cytoplasm, and cell membrane.

This distinction is fundamental in biology and helps classify organisms across domains.

Let me know if you'd like this formatted as a printable answer sheet!