Illustration of a prokaryotic cell highlighting its key components and structure.

Let’s go step by step through each question on the worksheet.

---

Question 1: Observe the structures that make prokaryotic cells so successful.

Prokaryotic cells (like bacteria) are simple but very good at surviving in many places — even extreme ones like hot springs or salty lakes. Here’s why they’re so successful:

- No nucleus needed: Their DNA floats freely, which lets them copy it and divide quickly.
- Cell wall: Protects them from bursting or drying out. Some have extra layers for tough environments.
- Flagella: Whip-like tails that help them swim toward food or away from danger.
- Pili: Tiny hair-like parts that help them stick to surfaces or share genes with other bacteria.
- Ribosomes: Make proteins fast — even though they’re smaller than ours, they work well.
- Small size: They can fit into tiny spaces and absorb nutrients easily across their membrane.
- Fast reproduction: Many split every 20 minutes under good conditions — huge numbers grow fast!
- Adaptability: Some can form spores to survive heat, cold, or no food for years.

→ So, success comes from being small, simple, fast-reproducing, and able to adapt.

---

Question 2: Name the missing cell parts and compare with a drawing of eukaryotic cells.

Looking at the labeled diagram (even though we can’t see it, based on standard prokaryote diagrams):

Common labels in prokaryotes:
- Cell membrane
- Cytoplasm
- Ribosomes
- Nucleoid (where DNA is)
- Flagellum
- Pili
- Capsule (sometimes)
- Cell wall

What’s MISSING compared to eukaryotic cells?

Eukaryotic cells (like plant or animal cells) have:
✔ Nucleus (with nuclear membrane) → Prokaryotes don’t have this — just nucleoid
✔ Mitochondria → Prokaryotes don’t have these; they do energy reactions in membrane
✔ Endoplasmic reticulum / Golgi apparatus → Not present in prokaryotes
✔ Lysosomes, vacuoles (large central one in plants) → Usually absent or different
✔ Chloroplasts (in plants) → Only in some eukaryotes; prokaryotes use other methods for photosynthesis
✔ Cytoskeleton (complex version) → Prokaryotes have simpler versions

So, main missing parts: nucleus, mitochondria, ER, Golgi, lysosomes, large vacuoles, chloroplasts

Comparison summary:
| Feature | Prokaryote | Eukaryote |
|---------------------|---------------------|----------------------|
| Nucleus | No | Yes |
| Membrane-bound organelles | None | Many |
| Size | Small (1–5 µm) | Larger (10–100 µm) |
| DNA shape | Circular | Linear chromosomes |
| Reproduction | Binary fission | Mitosis/Meiosis |

---

Question 3: Describe the purpose of ribosomes.

Ribosomes are like little protein factories inside all living cells — both prokaryotes and eukaryotes.

Their job:
- Read instructions from mRNA (which came from DNA)
- Link amino acids together in the right order
- Build proteins that the cell needs to live, grow, repair itself, or respond to its environment

In prokaryotes:
- Ribosomes float free in cytoplasm (not attached to anything)
- They’re slightly smaller than eukaryotic ribosomes (70S vs 80S), but still do the same basic job

Why important?
→ Without ribosomes, no proteins → no enzymes, no structure, no movement, no life!

Example: If a bacterium wants to digest sugar, it needs an enzyme made by ribosomes. If it wants to move, flagella proteins are built by ribosomes.

---

Final Answer:

1. Prokaryotic cells are successful because they are small, reproduce quickly, have protective cell walls, can move with flagella, attach with pili, and survive harsh conditions — all without needing complex organelles.

2. Missing parts compared to eukaryotes: nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, large vacuoles, chloroplasts. Prokaryotes lack membrane-bound organelles entirely.

3. Ribosomes build proteins by reading genetic instructions. Proteins are essential for nearly everything a cell does — growth, repair, movement, digestion, etc. All cells need ribosomes to survive.