1. What Is a Cell?
Simple biology
A cell is the smallest living unit of an organism. Some organisms are made of only one cell. Others, like humans, are made of trillions of cells working together. Every living cell faces the same basic problem: how does it stay alive? A cell must separate its inside from the outside world, bring in useful materials, make energy, build structures, remove waste, protect genetic information, and respond to danger.
How Cellula teaches it
In Cellula, you manage cells as survival systems. You begin with a simple cell and build the parts it needs to stay alive: membrane structures, transporters, organelles, cleanup systems, and defenses.
2. The Cell Membrane
Simple biology
Every cell needs a boundary. The cell membrane separates the inside of the cell from the outside environment and controls what enters and leaves. The membrane is made mostly of phospholipids that form a flexible double layer called the phospholipid bilayer.
How Cellula teaches it
In Cellula, the membrane appears as the ring around the cell. It protects the inside while also needing transporters so useful materials can enter.
3. Transporters in the Membrane
Simple biology
Many important molecules cannot simply drift through the membrane whenever they want. They need help from transporter proteins embedded in the membrane.
How Cellula teaches it
Cellula shows transporters as distinct membrane structures: red transporters move amino acids, blue transporters move glucose, and yellow skinny transporters move lipids. Different resources need different doors.
4. Nutrients and Resources
Simple biology
Cells need glucose, amino acids, lipids, oxygen, ATP, proteins, and membrane materials. These resources are physical materials that must be gathered and used.
How Cellula teaches it
Cellula makes resources visible. If a cell lacks key materials, it cannot build organelles, repair itself, or keep growing.
5. Mitochondria, Oxygen, and ATP
Simple biology
ATP is a major usable energy molecule. Mitochondria help many cells make large amounts of ATP by moving electrons through the electron transport chain. Oxygen accepts electrons at the end of that chain, allowing ATP production to continue efficiently.
How Cellula teaches it
In Cellula, red blood cells release Oâ‚‚ near the cell. Oxygen lets mitochondria keep producing ATP. Energy production also creates waste, so mitochondria must be supported by cleanup systems.
6. Waste and Lysosomes
Simple biology
Cells are busy, and activity creates waste. Lysosomes contain digestive enzymes that break down waste, damaged cell parts, and unwanted material.
How Cellula teaches it
In Cellula, lysosomes clean up waste before it becomes dangerous. They can also destroy viral genetic material before it reaches the nucleus.
7. Viruses and Infection
Simple biology
Viruses are not cells. They must enter living cells and use cellular machinery to make more copies. Many viruses begin by attaching to structures on the cell membrane and releasing genetic material.
How Cellula teaches it
In Cellula, bright green viruses can dock on receptors and release DNA or RNA. If viral genetic material reaches the nucleus, infection can take hold. A lysosome placed in the path can intercept it.
8. The Nucleus
Simple biology
The nucleus stores most of the cell’s DNA. DNA contains instructions for building proteins and controlling cell activity. The nucleus is best thought of as a protected information center.
How Cellula teaches it
In Cellula, the nucleus is something the player must protect. If viral DNA or RNA reaches it, the cell may be lost.
9. ER and Golgi
Simple biology
The endoplasmic reticulum helps make and process cellular materials. The Golgi apparatus receives materials, modifies them, sorts them, packages them, and sends them where they need to go.
How Cellula teaches it
In Cellula, the Golgi packages resources into vesicles and sends them toward the nearest cell. Survival is logistics.
10. Cell Division and Growth
Simple biology
Cells can grow and divide, creating new cells. But division requires enough energy, membrane material, proteins, and working internal systems.
How Cellula teaches it
In Cellula, dividing creates another cell to manage. More cells can increase survival potential, but they also increase complexity.
11. Immune Defense and B Cells
Simple biology
In multicellular organisms, immune cells help defend the body against threats. B cells can produce antibodies, which bind to specific targets and help fight invaders.
How Cellula teaches it
In Cellula, B cells appear as large purple immune cells with antibody-like structures. They help show that cells live in a larger battlefield.
12. Lysis and Game Over
Simple biology
A cell can die when its systems fail. Lysis happens when the cell breaks open and can no longer maintain the separation between inside and outside.
How Cellula teaches it
In Cellula, waste, infection, energy problems, or structural failure can cause a cell to lyse. Failure becomes information about which system broke.
13. What Cellula Teaches
Simple biology
Biology is not just vocabulary. A living cell is a system: borders, transport, energy, waste, defense, information, logistics, and growth all interact.
How Cellula teaches it
Cellula turns those ideas into play. The player learns by keeping a cell alive.
Glossary
Amino acids: building blocks of proteins.
ATP: the cell’s main usable energy molecule.
Cell membrane: flexible boundary around the cell.
DNA: molecule that stores genetic instructions.
Golgi apparatus: organelle that packages and ships materials.
GLUT1: a glucose transporter used as an entry point in Cellula.
Lysosome: organelle that breaks down waste and unwanted material.
Mitochondrion: organelle that helps make large amounts of ATP using fuel and oxygen.
Nucleus: protected information center of the cell.
Oxygen / Oâ‚‚: accepts electrons at the end of the mitochondrial electron transport chain.
Phospholipid bilayer: double-layer membrane structure.
Virus: infectious particle that must enter living cells to reproduce.