Cell City Quest

E Command & Cushioning: Inside the Cell

Cytoplasm Function Check

Explain why cytoplasm must be a fluid gel rather than a solid rock or empty void of air:

The Nucleus Command Center

The nucleus holds DNA. What would happen to an animal cell if its nucleus was surgically removed?

F Biology Detective: Real-World Scenarios

Scenario 1: An unwatered plant wilts, but its stems and leaves do not collapse into liquid soup. Which cell structure provides this stiff physical support? Explain.

Scenario 2: An antibacterial medicine damages the cell membrane of harmful bacteria. Why does destroying this boundary kill the bacterial cell?

Chapter 2 Vocabulary • Page 2 of 2

Tenet 2: The cell is the basic unit of life.

Tenet 3: All cells come from existing cells (or other cells).

Section C: One vs. Many Matrix

• Bacterium: Unicellular | Redwood: Multicellular | Amoeba: Unicellular | Human: Multicellular

Question Sample Response: Multicellular organisms are large and complex; individual cells specialize in specific roles (e.g., carrying oxygen, contracting muscles) and must cooperate so the whole organism survives.

Section D: Membrane vs. Wall

Sections E & F: Analysis & Detective Scenarios

Cytoplasm: A gel allows nutrients, proteins, and organelles to suspend and transport easily without floating into empty space or being crushed.

Nucleus Loss: The cell loses its DNA instructions, cannot synthesize new proteins or repair itself, and will quickly die.

Scenario 1 (Wilting Plant): The cell wall keeps the plant upright and maintains its cellular skeleton even when vacuoles lose water pressure.

Scenario 2 (Membrane Puncture): Without an intact cell membrane, internal cytoplasm leaks out, harmful toxins flood in, and the cell bursts and dies.

Lesson 1 Facilitator Guide • Page 2 of 2

Storage & Recycling: Vacuole & Lysosome

Sanitation & Warehousing

Vacuole

Stores water, food, and waste.

• Plant cells have one giant central vacuole.
• Animal cells have several small vacuoles.
• Provides water pressure to keep plants crisp.

Factory Analogy: Water Tank & Storage Warehouse

Lysosome

Breaks down waste and old parts.

• Packed with powerful digestive chemicals.
• Recycles worn-out organelles into spare parts.
• Destroys harmful bacteria and invaders.

Factory Analogy: Recycling Crew & Custodian

Without lysosomes and vacuoles, the cell factory would drown in its own garbage!

Plant Cells vs. Animal Cells

Organelle Comparison

Both Have:

• • Cell Membrane
• • Cytoplasm
• • Nucleus (DNA)
• • Mitochondria
• • Ribosomes
• • Rough & Smooth ER
• • Golgi Body

Plant Cells:

• 1. Cell Wall Stiff outer support layer
• 2. Chloroplast Makes food from sunlight
• 3. Giant Vacuole Huge central water tank

Animal Cells:

• 1. No Cell Wall Flexible membrane only
• 2. No Chloroplast Must eat other organisms
• 3. Small Vacuoles Multiple tiny storage sacs

Both plants and animals have mitochondria to release energy from food!

The Protein Pipeline: Teamwork in Action

Organelle Cooperation

Step 1

Nucleus

Sends out the master recipe (DNA instructions).

➔

Step 2

Ribosome

Builds the protein chain piece by piece.

➔

Step 3

Rough ER

Folds and moves the protein through tunnels.

➔

Step 4

Golgi Body

Packages and ships the protein out of the cell!

Delivered!

Next Step: Complete Organelle Powerhouse Worksheet

Time to apply!

Malfunctioning Organelle:

Patient Gamma: A liver cell is exposed to dangerous medications and toxins, but its ability to break down poisons and make fats has completely stopped.

Malfunctioning Organelle:

D Plant Cell vs. Animal Cell Organelle Checklist

Place a checkmark (✓) in each column if the organelle is present in that cell type.

E Energy Duel: Mitochondria vs. Chloroplast

A classmate says: "Plants only need chloroplasts because they make food, so they don't have or need mitochondria."

Using the exact vocabulary definitions of chloroplast and mitochondria, explain why this classmate is incorrect:

Chapter 2 Vocabulary • Page 2 of 2

Part B: Protein Pipeline

Step 1: Holds the cell's DNA.

Step 2: Ribosome; actually builds the protein.

Step 3: Rough ER; moves proteins.

Step 4: Golgi body; packages & ships proteins.

Question: Division of labor allows proteins to be modified, checked, and tagged without jamming up synthesis.

Part C: Organelle Malfunction Mysteries

• Patient Alpha: Lysosome (fails to break down waste and old parts).

• Patient Beta: Mitochondria (fails to release energy from food).

• Patient Gamma: Smooth ER (fails to make fats and break down poisons).

Part D: Plant vs. Animal Checklist

Part E: The Energy Duel

Key Response: Chloroplasts make food (sugar) from sunlight, but that food is inactive stored energy. The cell cannot use raw glucose directly to power its activities. The plant must have mitochondria to release that energy from food through cellular respiration so the plant cell can live, grow, and repair itself.

Lesson 2 Facilitator Guide • Page 2 of 2

3. [ B ] Ribosomes (makes it rough).

4. [ B ] Smooth ER (makes fats; breaks down poisons).

Part 2: Organelle Identification Answers (1 Pt Each / 10 Pts Total)

1. Cell

2. Nucleus

3. Cytoplasm

4. Mitochondria

5. Ribosome

6. Golgi body

7. Lysosome

8. Vacuole

9. Chloroplast

10. Cell wall

Part 3: Comparative Analysis Scoring Rubric (6 Pts Each / 12 Pts Total)

Question 3A Criteria (6 Pts):

• Unicellular Definition & Example (3 pts): Made of one cell (e.g., bacteria, amoeba, paramecium).

• Multicellular Definition & Example (3 pts): Made of many cells (e.g., human, tree, dog, mushroom).

Question 3B Criteria (6 Pts):

• Identification (3 pts): Names Cell Wall and Chloroplast (or large central vacuole).

• Biological Rationale (3 pts): Explains that animals have skeletons or muscles for support and move to consume food (heterotrophs), so they do not make food from sunlight or require a rigid box-like cell wall.

Vocabulary Coverage Verification:

Assesses all 17 Chapter 2 terms: Cell, Cell theory, Unicellular, Multicellular, Organelle, Nucleus, Cell membrane, Cell wall, Cytoplasm, Mitochondria, Ribosome, Rough ER, Smooth ER, Golgi body, Lysosome, Vacuole, Chloroplast.

Chapter 2 Assessment Scoring Guide • Page 2 of 2