Bacterial cell: a Gram-negative rod
Before you start
Can a cell live without a nucleus? Bacteria use genetic information in a nucleoid, ribosomes and a plasma membrane to carry out life processes.
The setupThis is an enlarged, colour-coded cutaway. Select a structure for its name, function and recognition clues. Close the cutaway to inspect the exterior; the list also selects hidden structures.
What to do and noticeStart with the boundaries, then explore inside; distinguish a wall from a membrane. · Select a structure, read what it does, then use Focus to inspect its detail. · Find the nucleoid and ribosomes: no nucleus does not mean no DNA.
Predict firstAre a cell membrane and a cell wall the same structure?
Explain functions from structures rather than memorizing names alone.
Prerequisites: Cells are basic units of life. Different cell types share needs but have different structures.Start at the boundary
Predict firstAre a cell membrane and a cell wall the same structure?
No. The plasma membrane controls traffic; a wall provides support and protection. Animal cells have a membrane without such a wall, and bacterial, plant and fungal walls differ in composition.
How to observe
- Start with the boundaries, then explore inside; distinguish a wall from a membrane.
- Select a structure, read what it does, then use Focus to inspect its detail.
- Find the nucleoid and ribosomes: no nucleus does not mean no DNA.
Model notes
Sizes, counts and colours are adjusted for teaching; this is not a raw microscope image. Cellular organization is dynamic. Each model represents one example, not every member of its group; bacterial accessory structures, plant chloroplasts and fungal forms particularly vary.