Prokaryotes and Eukaryotes

What is Prokaryotes and Eukaryotes?

Within Biology, which covers cells, the human body, genetics, evolution, plants and ecosystems: the science of living things, this topic explains Prokaryotes and Eukaryotes. Biology topics show how living things work, from the cell up to whole ecosystems, with models you can explore step by step.

Check that you can explain Prokaryotes and Eukaryotes in your own words and give one example from everyday life. If you can do that, you have understood the core idea.

Understanding Prokaryotes and Eukaryotes helps you explain how living things stay alive and respond to their surroundings, which is central to biology exams.

Prokaryotes and Eukaryotes in detail

Prokaryotic cells, such as bacteria, are small and simple with no nucleus; their DNA is a single loop in the cytoplasm, sometimes with extra small rings called plasmids. They have a cell wall, a cell membrane and ribosomes, and may have a flagellum for movement.

Eukaryotic cells, found in animals, plants, fungi and protists, are larger and have a nucleus enclosed by a membrane plus other membrane-bound organelles. The distinction is one of the most fundamental in biology. Prokaryotes are also the earliest forms of life, and mitochondria and chloroplasts probably began as prokaryotes engulfed by larger cells.

How the interactive helps you understand Prokaryotes and Eukaryotes

Watch the cell model in the interactive. Use any sliders or buttons it offers to change the values and see how the cell model responds.

Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Prokaryotes and Eukaryotes.

Real-life uses and examples

• Use Prokaryotes and Eukaryotes to interpret a diagram, graph or microscope image from a practical.
• Structure a longer answer about Prokaryotes and Eukaryotes by moving from definition to example to consequence.
• Explain how Prokaryotes and Eukaryotes helps a living thing stay alive, using a plant or animal example.

Common mistakes to avoid

• Using everyday words, such as “energy” or “bad”, without their scientific meaning.
• Listing the steps of a process without saying how one step causes the next.
• Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.