Your cells are like tiny factories packed with specialised compartments...
Biology463 views·Updated 23 Jun 2026·11 pagesWJEC Biology AS Level Unit 1.2 Study Notes
K
Kealan Jones@kealanjones_puup
1 / 10
1
of 10
Cell Control Centre and Protein Factory
Think of the nucleus as your cell's headquarters - it's where all the important decisions get made. This double-membraned structure contains your genetic material in the form of chromatin, which is basically DNA wrapped around proteins called histones like thread around a spool.
Inside the nucleus, you'll find the nucleolus, which acts like a ribosome factory, churning out ribosomal RNA. The nucleoplasm is simply the fluid that fills this space, similar to how cytoplasm fills the rest of the cell.
The endoplasmic reticulum (ER) comes in two flavours. Rough ER looks bumpy because it's covered in ribosomes and specialises in protein synthesis and modification. Smooth ER handles lipid and carbohydrate synthesis and even helps detoxify harmful substances - think of it as your cell's liver!
Quick Tip: Remember that rough ER = ribosomes = protein production, whilst smooth ER = smooth operations for lipids and detox!
2
of 10
Protein Production and Cellular Powerhouses
Ribosomes are your cell's protein-making machines, and they're not picky about location. You'll find the larger 80S ribosomes floating in cytoplasm or stuck to rough ER, whilst smaller 70S ribosomes hang out in mitochondria and chloroplasts.
The Golgi apparatus is like your cell's post office - it receives proteins from the ER, modifies them (often by adding sugars to make glycoproteins and glycolipids), packages them up, and ships them where they need to go.
Mitochondria are absolutely crucial because they're your cell's power stations. These double-membraned organelles have folded inner membranes called cristae that massively increase surface area for ATP synthesis. They even have their own circular DNA and 70S ribosomes - pretty independent, right?
Remember: More mitochondria = more energy needed. That's why muscle cells are packed with them!
3
of 10
Cell Support and Specialised Structures
The cytoskeleton isn't technically an organelle, but it's essential for giving your cells shape and helping them move things around internally. Think of it as the cell's scaffolding made of microtubules and microfilaments.
Vacuoles and vesicles are basically storage containers. In plants, the massive central vacuole helps maintain cell shape and stores various substances, whilst animal cells have smaller, more specialised versions.
Animal cells get some exclusive features too. Lysosomes are like cellular recycling centres, packed with digestive enzymes to break down worn-out cell parts. Centrioles help with cell division, whilst cilia and flagella act like tiny propellers for cell movement.
Key Point: Lysosomes are often called "suicide sacs" because they can digest the entire cell when it's damaged beyond repair!
4
of 10
Plant Cell Powerhouses and Protection
Chloroplasts are what make plants green and are absolutely essential for photosynthesis. Like mitochondria, they have double membranes, circular DNA, and 70S ribosomes. Inside, you'll find stacks of thylakoids called grana where the light reactions happen.
The cellulose cell wall gives plant cells their rigid structure and protection - something animal cells completely lack. Plasmadesmata are tiny tunnels through cell walls that allow neighbouring plant cells to communicate and share resources.
Plant cells also have that massive central vacuole we mentioned earlier. The tonoplast membrane controls what goes in and out of this structure, and the cell sap inside contains everything from mineral salts to waste products.
Fun Fact: Without chloroplasts, there'd be no oxygen in our atmosphere - they're literally keeping us alive!
5
of 10
Simple but Successful: Bacterial Cells
Prokaryotes like bacteria prove you don't need complexity to be successful - they've been around for billions of years! Unlike your cells, they have no membrane-bound organelles and their circular DNA floats freely in the cytoplasm.
Plasmids are brilliant little extras that bacteria use to share useful genes (like antibiotic resistance) with each other. The cell wall is made of peptidoglycan, giving bacteria their shape and protection.
Some bacteria have mesosomes - folded membrane areas where ATP production happens since they don't have mitochondria. The capsule provides extra protection, whilst flagella work like rotating propellers for movement.
Important: Understanding bacterial structure is crucial for understanding how antibiotics work and why antibiotic resistance is such a problem!
6
of 10
Bacterial Survival and Evolutionary Connections
Bacteria have some clever attachments for survival. Fimbriae help them stick to surfaces, whilst pili are used during bacterial conjugation when they share genetic material. Photosynthetic lamellae in some bacteria contain the pigments needed for photosynthesis.
Endosymbiosis is a fascinating theory explaining how complex cells evolved. It suggests that mitochondria and chloroplasts were once free-living bacteria that got engulfed by early cells. The evidence? They have circular DNA, 70S ribosomes, and can only reproduce by dividing.
Binary fission is how bacteria reproduce - they simply copy their DNA and split in two, sometimes every 20 minutes! No fancy mitosis needed when you're this simple.
Mind-blowing: The mitochondria in your cells might be descendants of ancient bacteria that formed a partnership with your ancestors!
7
of 10
Viruses: Not Quite Alive
Viruses are fascinating because they're not technically alive - they're just genetic material (DNA or RNA) wrapped in a protein coat called a capsid. Outside a host cell, they're completely inactive particles called virions.
They come in different shapes: helical (spiral), polyhedral , and complex (like the bacteriophages that look like lunar landers). All viruses need to hijack a living cell's machinery to reproduce - they're the ultimate parasites.
The fact that viruses can crystallise like minerals shows just how different they are from living cells. They only spring into action once they've infected a host cell.
Key Concept: Viruses blur the line between living and non-living, which is why they're so tricky to treat with conventional medicines!
8
of 10
Tissue Types: Cells Working Together
Epithelial tissue is your body's protective covering and lining material. It sits on a basement membrane and has no blood vessels of its own. The shapes vary: squamous (flat), cuboidal , and columnar (tall and thin).
Simple epithelium has just one layer and is perfect for diffusion and absorption. Stratified epithelium has multiple layers for extra protection. Ciliated epithelium uses tiny cilia to sweep particles away - crucial in your airways.
Glandular epithelium makes secretions. Exocrine glands secrete through ducts (like sweat glands), whilst endocrine glands dump hormones straight into your bloodstream. Microvilli increase surface area for better absorption without needing energy.
Study Tip: Remember that simple = one layer = easy diffusion, whilst stratified = many layers = tough protection!
9
of 10
Muscle Power: Three Types, Three Jobs
Smooth muscle is the quiet achiever - it's involuntary and non-striated, working behind the scenes in your arteries, gut, and breathing system. You can't control it consciously, which is probably for the best!
Skeletal muscle is what you flex to show off - it's voluntary and striated (striped appearance). These muscles attach to bones via tendons and are under your conscious control.
Cardiac muscle is special because it's striated like skeletal muscle but involuntary like smooth muscle. It's myogenic, meaning the heart generates its own electrical signals without waiting for your brain to tell it what to do.
Life Saver: Your heart's ability to beat independently is why heart transplants are possible - it doesn't need to be connected to your nervous system to work!
10
of 10
Connective Tissue: The Body's Support Network
Connective tissue is your body's support system, made up of cells and an extracellular matrix containing collagen fibres (for strength) and elastic fibres (for stretch and recoil). It connects, supports, and separates other tissues.
Dense connective tissue includes tendons (connecting muscle to bone) and ligaments (connecting bone to bone). Loose connective tissue acts as packing material, whilst adipose tissue stores energy and provides cushioning.
Supporting connective tissues like cartilage and bone give your body structural integrity. Blood is even considered a connective tissue because it has cells floating in an extracellular matrix (plasma)!
Remember: Tendons = muscle to bone, Ligaments = bone to bone. Think "L for Like connects Like" - bones to bones!
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Biology463 views·Updated 23 Jun 2026·11 pagesWJEC Biology AS Level Unit 1.2 Study Notes
K
Kealan Jones@kealanjones_puup
Your cells are like tiny factories packed with specialised compartments called organelles, each with a specific job to keep you alive. Understanding how these cellular structures work together is crucial for grasping everything from photosynthesis to how your muscles contract.
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Cell Control Centre and Protein Factory
Think of the nucleus as your cell's headquarters - it's where all the important decisions get made. This double-membraned structure contains your genetic material in the form of chromatin, which is basically DNA wrapped around proteins called histones like thread around a spool.
Inside the nucleus, you'll find the nucleolus, which acts like a ribosome factory, churning out ribosomal RNA. The nucleoplasm is simply the fluid that fills this space, similar to how cytoplasm fills the rest of the cell.
The endoplasmic reticulum (ER) comes in two flavours. Rough ER looks bumpy because it's covered in ribosomes and specialises in protein synthesis and modification. Smooth ER handles lipid and carbohydrate synthesis and even helps detoxify harmful substances - think of it as your cell's liver!
Quick Tip: Remember that rough ER = ribosomes = protein production, whilst smooth ER = smooth operations for lipids and detox!
2
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Protein Production and Cellular Powerhouses
Ribosomes are your cell's protein-making machines, and they're not picky about location. You'll find the larger 80S ribosomes floating in cytoplasm or stuck to rough ER, whilst smaller 70S ribosomes hang out in mitochondria and chloroplasts.
The Golgi apparatus is like your cell's post office - it receives proteins from the ER, modifies them (often by adding sugars to make glycoproteins and glycolipids), packages them up, and ships them where they need to go.
Mitochondria are absolutely crucial because they're your cell's power stations. These double-membraned organelles have folded inner membranes called cristae that massively increase surface area for ATP synthesis. They even have their own circular DNA and 70S ribosomes - pretty independent, right?
Remember: More mitochondria = more energy needed. That's why muscle cells are packed with them!
3
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Cell Support and Specialised Structures
The cytoskeleton isn't technically an organelle, but it's essential for giving your cells shape and helping them move things around internally. Think of it as the cell's scaffolding made of microtubules and microfilaments.
Vacuoles and vesicles are basically storage containers. In plants, the massive central vacuole helps maintain cell shape and stores various substances, whilst animal cells have smaller, more specialised versions.
Animal cells get some exclusive features too. Lysosomes are like cellular recycling centres, packed with digestive enzymes to break down worn-out cell parts. Centrioles help with cell division, whilst cilia and flagella act like tiny propellers for cell movement.
Key Point: Lysosomes are often called "suicide sacs" because they can digest the entire cell when it's damaged beyond repair!
4
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Plant Cell Powerhouses and Protection
Chloroplasts are what make plants green and are absolutely essential for photosynthesis. Like mitochondria, they have double membranes, circular DNA, and 70S ribosomes. Inside, you'll find stacks of thylakoids called grana where the light reactions happen.
The cellulose cell wall gives plant cells their rigid structure and protection - something animal cells completely lack. Plasmadesmata are tiny tunnels through cell walls that allow neighbouring plant cells to communicate and share resources.
Plant cells also have that massive central vacuole we mentioned earlier. The tonoplast membrane controls what goes in and out of this structure, and the cell sap inside contains everything from mineral salts to waste products.
Fun Fact: Without chloroplasts, there'd be no oxygen in our atmosphere - they're literally keeping us alive!
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Simple but Successful: Bacterial Cells
Prokaryotes like bacteria prove you don't need complexity to be successful - they've been around for billions of years! Unlike your cells, they have no membrane-bound organelles and their circular DNA floats freely in the cytoplasm.
Plasmids are brilliant little extras that bacteria use to share useful genes (like antibiotic resistance) with each other. The cell wall is made of peptidoglycan, giving bacteria their shape and protection.
Some bacteria have mesosomes - folded membrane areas where ATP production happens since they don't have mitochondria. The capsule provides extra protection, whilst flagella work like rotating propellers for movement.
Important: Understanding bacterial structure is crucial for understanding how antibiotics work and why antibiotic resistance is such a problem!
6
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Bacterial Survival and Evolutionary Connections
Bacteria have some clever attachments for survival. Fimbriae help them stick to surfaces, whilst pili are used during bacterial conjugation when they share genetic material. Photosynthetic lamellae in some bacteria contain the pigments needed for photosynthesis.
Endosymbiosis is a fascinating theory explaining how complex cells evolved. It suggests that mitochondria and chloroplasts were once free-living bacteria that got engulfed by early cells. The evidence? They have circular DNA, 70S ribosomes, and can only reproduce by dividing.
Binary fission is how bacteria reproduce - they simply copy their DNA and split in two, sometimes every 20 minutes! No fancy mitosis needed when you're this simple.
Mind-blowing: The mitochondria in your cells might be descendants of ancient bacteria that formed a partnership with your ancestors!
7
of 10Sign up to see the content. It's free!
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Viruses: Not Quite Alive
Viruses are fascinating because they're not technically alive - they're just genetic material (DNA or RNA) wrapped in a protein coat called a capsid. Outside a host cell, they're completely inactive particles called virions.
They come in different shapes: helical (spiral), polyhedral , and complex (like the bacteriophages that look like lunar landers). All viruses need to hijack a living cell's machinery to reproduce - they're the ultimate parasites.
The fact that viruses can crystallise like minerals shows just how different they are from living cells. They only spring into action once they've infected a host cell.
Key Concept: Viruses blur the line between living and non-living, which is why they're so tricky to treat with conventional medicines!
8
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Tissue Types: Cells Working Together
Epithelial tissue is your body's protective covering and lining material. It sits on a basement membrane and has no blood vessels of its own. The shapes vary: squamous (flat), cuboidal , and columnar (tall and thin).
Simple epithelium has just one layer and is perfect for diffusion and absorption. Stratified epithelium has multiple layers for extra protection. Ciliated epithelium uses tiny cilia to sweep particles away - crucial in your airways.
Glandular epithelium makes secretions. Exocrine glands secrete through ducts (like sweat glands), whilst endocrine glands dump hormones straight into your bloodstream. Microvilli increase surface area for better absorption without needing energy.
Study Tip: Remember that simple = one layer = easy diffusion, whilst stratified = many layers = tough protection!
9
of 10Sign up to see the content. It's free!
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By signing up you accept Terms of Service and Privacy Policy
Muscle Power: Three Types, Three Jobs
Smooth muscle is the quiet achiever - it's involuntary and non-striated, working behind the scenes in your arteries, gut, and breathing system. You can't control it consciously, which is probably for the best!
Skeletal muscle is what you flex to show off - it's voluntary and striated (striped appearance). These muscles attach to bones via tendons and are under your conscious control.
Cardiac muscle is special because it's striated like skeletal muscle but involuntary like smooth muscle. It's myogenic, meaning the heart generates its own electrical signals without waiting for your brain to tell it what to do.
Life Saver: Your heart's ability to beat independently is why heart transplants are possible - it doesn't need to be connected to your nervous system to work!
10
of 10Sign up to see the content. It's free!
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- Improve your grades
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By signing up you accept Terms of Service and Privacy Policy
Connective Tissue: The Body's Support Network
Connective tissue is your body's support system, made up of cells and an extracellular matrix containing collagen fibres (for strength) and elastic fibres (for stretch and recoil). It connects, supports, and separates other tissues.
Dense connective tissue includes tendons (connecting muscle to bone) and ligaments (connecting bone to bone). Loose connective tissue acts as packing material, whilst adipose tissue stores energy and provides cushioning.
Supporting connective tissues like cartilage and bone give your body structural integrity. Blood is even considered a connective tissue because it has cells floating in an extracellular matrix (plasma)!
Remember: Tendons = muscle to bone, Ligaments = bone to bone. Think "L for Like connects Like" - bones to bones!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
Where can I download the Knowunity app?
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