Ever wondered what makes you different from a bacterium? It...
Biology202 views·Updated 17 Aug 2026·2 pagesUnderstanding Cells: AQA Combined Science Foundation Notes
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1
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Cell Types and Animal Cells
There are two main types of cells you need to know about: eukaryotic and prokaryotic. Think of eukaryotic cells as the fancy, complex ones - that's what you're made of! All animal and plant cells are eukaryotic.
Prokaryotic cells are much simpler and smaller. Bacteria are the perfect example of prokaryotic cells, and they're everywhere around us.
Animal cells have several key parts that work like a well-organised team. The nucleus acts like the control centre, containing all the genetic material that tells the cell what to do. The mitochondria are like tiny power stations where aerobic respiration happens - this process transfers the energy your cells need to function.
You'll also find ribosomes scattered throughout animal cells. These are the protein factories where all the proteins your body needs get made. The cytoplasm is the jelly-like substance where most chemical reactions take place, whilst the cell membrane acts like a selective bouncer, controlling what enters and leaves the cell.
Quick Tip: Remember that animal cells don't have cell walls - that's what makes them flexible enough for you to move around!
2
of 2
Plant Cells and Bacterial Cells
Plant cells have everything animal cells have, plus some extra bits that make them special. The cell wall made of cellulose acts like armour, supporting and strengthening the plant. The permanent vacuole stores cell sap and helps keep the plant upright.
Most importantly, plant cells contain chloroplasts - these green structures are where photosynthesis happens. This amazing process allows plants to make their own food using sunlight, which is why they don't need to hunt for dinner like animals do!
Bacterial cells are completely different beasts. They're prokaryotic, which means they don't have a proper nucleus. Instead, they have a single loop of DNA floating freely in the cytoplasm. They also contain plasmids - small rings of extra DNA that can be really useful in genetic engineering.
When you need to estimate the area of cellular structures like mitochondria, treat them like regular shapes. For example, if a mitochondrion looks rectangular and measures 10 μm by 1 μm, simply multiply: 10 × 1 = 10 μm². It's that straightforward!
Remember: Bacterial cells are prokaryotic (no true nucleus), whilst plant and animal cells are eukaryotic (proper nucleus present).
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Biology202 views·Updated 17 Aug 2026·2 pagesUnderstanding Cells: AQA Combined Science Foundation Notes
a🩷@pugloverrrrx
Ever wondered what makes you different from a bacterium? It all comes down to cells - the tiny building blocks that make up every living thing. Understanding the different types of cells and their parts is crucial for grasping how...
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Cell Types and Animal Cells
There are two main types of cells you need to know about: eukaryotic and prokaryotic. Think of eukaryotic cells as the fancy, complex ones - that's what you're made of! All animal and plant cells are eukaryotic.
Prokaryotic cells are much simpler and smaller. Bacteria are the perfect example of prokaryotic cells, and they're everywhere around us.
Animal cells have several key parts that work like a well-organised team. The nucleus acts like the control centre, containing all the genetic material that tells the cell what to do. The mitochondria are like tiny power stations where aerobic respiration happens - this process transfers the energy your cells need to function.
You'll also find ribosomes scattered throughout animal cells. These are the protein factories where all the proteins your body needs get made. The cytoplasm is the jelly-like substance where most chemical reactions take place, whilst the cell membrane acts like a selective bouncer, controlling what enters and leaves the cell.
Quick Tip: Remember that animal cells don't have cell walls - that's what makes them flexible enough for you to move around!
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Plant Cells and Bacterial Cells
Plant cells have everything animal cells have, plus some extra bits that make them special. The cell wall made of cellulose acts like armour, supporting and strengthening the plant. The permanent vacuole stores cell sap and helps keep the plant upright.
Most importantly, plant cells contain chloroplasts - these green structures are where photosynthesis happens. This amazing process allows plants to make their own food using sunlight, which is why they don't need to hunt for dinner like animals do!
Bacterial cells are completely different beasts. They're prokaryotic, which means they don't have a proper nucleus. Instead, they have a single loop of DNA floating freely in the cytoplasm. They also contain plasmids - small rings of extra DNA that can be really useful in genetic engineering.
When you need to estimate the area of cellular structures like mitochondria, treat them like regular shapes. For example, if a mitochondrion looks rectangular and measures 10 μm by 1 μm, simply multiply: 10 × 1 = 10 μm². It's that straightforward!
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