Understanding Cell Types: Eukaryotes vs Prokaryotes Revision Notes | GCSE OCR Foundation Biology

What this lesson covers

Students will explore the key differences between eukaryotic cells (plant and animal cells) and prokaryotic cells (bacterial cells), comparing their str...

• Compare the structure of prokaryotic and eukaryotic cells
• Identify key organelles in plant and animal cells
• Explain why bacterial cells are classified as prokaryotes
• Describe the function of plasmids in bacterial cells

Key ideas to keep in view

Use this lesson to stay inside B1.1 Cell structures while connecting the detail back to the wider B1: Cell level systems topic.

• B1: Cell level systems
• B1.1 Cell structures
• GCSE OCR Foundation Biology

Lesson notes preview

Read the core explanations from Understanding Cell Types: Eukaryotes vs Prokaryotes before testing yourself from memory.

• Every living thing is made of cells, but not all cells are the same. There's a fundamental divide in the living world - some cells keep their DNA locked away in a special compartment, while others let it float freely. This difference is so important that it splits all life into two major groups.
• A cell with genetic material enclosed in a nucleus. Found in plants, animals, fungi and protists.
• A cell with genetic material not enclosed in a nucleus. Found in bacteria and archaea.
• Trap: Many students think 'prokaryotic' means 'simple' and 'eukaryotic' means 'complex'. Actually, both are highly sophisticated - they just organise their contents differently. Bacteria can do things like photosynthesis and nitrogen fixation that many eukaryotes cannot.
• 2. Plant and Animal Cells - The Eukaryotic Stars
• Plant and animal cells are the eukaryotes you know best. Picture looking at an animal cell under a microscope - you'd see a clear boundary (the cell membrane), jelly-like contents (cytoplasm), and a dark blob in the centre (the nucleus). The nucleus is like a vault containing all the cell's genetic instructions.
• All eukaryotic cells share three essential features: a cell membrane that controls what enters and leaves, cytoplasm where chemical reactions happen, and genetic material safely locked in a nucleus. This nucleus is what makes them 'eukaryotic' - the word literally means 'true nucleus'.
• Exam depth extension: In understanding cell types: eukaryotes vs prokaryotes, connect the two types of cells to plant and animal cells - the eukaryotic stars using clear cause-and-effect statements. When you explain biological processes, include what changes, why it changes, and the consequence for cells, organisms,...
• Bacterial cells are completely different. They're much smaller - you could fit thousands of bacteria inside a single animal cell. When you zoom in on a bacterial cell, you won't find a nucleus. Instead, the DNA floats freely in the cytoplasm as a single loop.
• But bacteria are not simply 'cells without a nucleus'. They have their own special features. The cell membrane is surrounded by a tough cell wall for protection. Most importantly, they often carry extra DNA in small rings called plasmids - think of these as bonus genetic instructions that can be shared between bacte...

Continue through the topic

Move to the related lessons or back to the topic page when you need the wider sequence before exam-style practice.