Every living thing is made up of cells - from... Show more
Biology122 views·Updated May 20, 2026·7 pagesFoundational Biology: Cell Structure & Function - Revision Paper 1
L
liv gmk@livgmk_et9xntetbiu3z
1 / 7
1
of 7
The Basic Unit of Life
Think of cells as nature's LEGO blocks - they're the smallest units that can actually live and reproduce on their own. All living organisms fall into two main camps based on how their cells are structured.
Eukaryotic cells are the complex ones with a proper nucleus (like a control room) where the DNA is safely stored. These make up animals, plants, and fungi - basically anything you can see without a microscope, plus some microscopic organisms too.
Prokaryotic cells are much simpler and smaller, with their DNA just floating freely in the cytoplasm instead of being locked away in a nucleus. Bacteria are the classic example of prokaryotic organisms.
Quick Tip: Remember "Pro-karyotic" = "Pro-blem" (no nucleus), "Eu-karyotic" = "Eu-reka!" (has a nucleus)
The key difference isn't just size - it's all about organisation. Eukaryotic cells are like well-organised offices with separate departments, whilst prokaryotic cells are more like open-plan spaces where everything happens together.
2
of 7
Specialised Cells for Reproduction
Your body contains hundreds of different cell types, but sperm and egg cells are probably the most specialised you'll study. These cells have one job: create the next generation.
Sperm cells are basically tiny biological missiles designed to deliver male DNA. The acrosome (tip) contains enzymes that literally digest through the egg's membrane. The middle section is packed with mitochondria for energy, whilst the long tail acts as a propeller for swimming.
Egg cells are the complete opposite - they're huge, stationary, and loaded with nutrients. The cytoplasm contains everything needed to nourish a developing embryo. After fertilisation, the cell membrane completely changes structure to block any other sperm from entering.
Remember: Both sperm and egg cells are haploid, meaning they only contain half the normal number of chromosomes - that's why you get traits from both parents!
This specialisation shows how cells can be modified for incredibly specific functions, moving far beyond the basic "generic" cell structure you might imagine.
3
of 7
Essential Cell Structures
Every cell needs certain basic components to function, regardless of whether it's from your skin, a plant leaf, or a bacterial colony. Think of these as the essential "furniture" that every cell must have.
The nucleus acts like the cell's library and control centre, storing all the genetic material (DNA) that determines what the cell does. The cell membrane is basically a selective bouncer, deciding what gets in and what stays out.
Cytoplasm might look like just watery stuff, but it's where most of the cell's chemistry happens. Mitochondria are the powerhouses, breaking down glucose to release energy through aerobic respiration. Ribosomes are tiny protein factories, reading genetic instructions to build the proteins the cell needs.
Exam Tip: Learn these five structures first - they appear in almost every cell biology question you'll face!
Understanding these basic components gives you the foundation for grasping how more complex cellular processes work. Each structure has evolved to perform specific, essential functions that keep the cell alive and functioning.
4
of 7
Plant vs Animal Cell Differences
While animal and plant cells share the basic structures, plant cells have some extra features that help them survive as stationary organisms that make their own food.
The cell wall made of cellulose provides structural support - imagine it as scaffolding around a building. Since plants can't move away from danger, they need this extra protection and support that animal cells simply don't require.
Chloroplasts are where the magic of photosynthesis happens, containing chlorophyll that captures sunlight energy. The permanent vacuole stores cell sap and helps maintain the plant's structure by keeping cells rigid when full of water.
Memory Trick: Plants have "extra" structures (wall, chloroplasts, vacuole) because they live an "extra" challenging lifestyle - stuck in one spot!
Animal cells are more flexible and mobile, which is why they don't need rigid cell walls. Instead, they rely on their flexible cell membranes and can change shape as needed for movement and other functions.
5
of 7
Transport and Cell Division
Cells constantly need to move substances in and out, and they use three main methods depending on what they're transporting. Diffusion is the simplest - particles naturally spread from crowded areas to less crowded ones, like perfume spreading across a room.
Osmosis is specifically about water movement through partially permeable membranes, always flowing from areas with more water to areas with less water. Active transport is different because it requires energy to move substances against their natural flow - like pushing water uphill.
Mitosis is how cells create exact copies of themselves. The process involves the DNA condensing into visible chromosomes, lining up in the middle, then being pulled apart to create two identical daughter cells.
Key Point: Active transport is the only method that requires energy - remember this for your exams!
These processes are absolutely fundamental to life. Without efficient transport systems and cell division, multicellular organisms like humans simply couldn't exist or grow.
6
of 7
Cell Specialisation and Differentiation
Stem cells are like biological blank canvases that can transform into any type of specialised cell the body needs. Through differentiation, these cells develop specific features that make them perfect for particular jobs.
Sperm cells are built for speed and penetration, with mitochondria for energy and enzymes to break through egg membranes. Muscle cells are long and packed with mitochondria to contract powerfully. Nerve cells are incredibly long with branched ends to carry electrical signals across your body.
Plant cells show amazing specialisation too. Root hair cells have massive surface areas for absorbing water and minerals. Palisade cells are stuffed with chloroplasts to maximise photosynthesis in leaves.
Think About It: Every specialised cell sacrifices some abilities to become really good at one specific function - it's nature's version of career specialisation!
Xylem and phloem cells form the plant's transport system - xylem carries water upwards whilst phloem moves sugars around the plant. Understanding these specialisations helps explain how complex organisms function so efficiently.
7
of 7
Plant Transport Systems
Plants face a unique challenge - they need to move water from their roots to their highest leaves, sometimes over 100 metres high in giant trees. Root hair cells start this process with their enormous surface area that acts like a massive sponge.
Palisade cells in leaves are the photosynthesis specialists, packed with chloroplasts positioned to catch maximum sunlight. These cells produce the sugars that need transporting around the plant.
The plant's transport highways are xylem and phloem vessels. Xylem cells are actually dead, forming hollow tubes perfect for water transport from roots upward. Phloem cells remain alive and use sieve tubes with companion cells to actively transport sugars and amino acids to wherever the plant needs them.
Amazing Fact: The transport system in a single tree moves thousands of litres of water every day - that's more efficient than most human-made pumping systems!
This transport network is so efficient that it can move materials from the deepest roots to the highest branches, keeping every cell in a massive plant properly supplied with water and nutrients.
We thought you’d never ask...
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Biology122 views·Updated May 20, 2026·7 pagesFoundational Biology: Cell Structure & Function - Revision Paper 1
L
liv gmk@livgmk_et9xntetbiu3z
Every living thing is made up of cells - from the tiniest bacteria to massive oak trees and even you! Understanding how cells work is absolutely crucial for your biology studies, as they're literally the building blocks of all life... Show more
1
of 7Sign up to see the content. It's free!
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The Basic Unit of Life
Think of cells as nature's LEGO blocks - they're the smallest units that can actually live and reproduce on their own. All living organisms fall into two main camps based on how their cells are structured.
Eukaryotic cells are the complex ones with a proper nucleus (like a control room) where the DNA is safely stored. These make up animals, plants, and fungi - basically anything you can see without a microscope, plus some microscopic organisms too.
Prokaryotic cells are much simpler and smaller, with their DNA just floating freely in the cytoplasm instead of being locked away in a nucleus. Bacteria are the classic example of prokaryotic organisms.
Quick Tip: Remember "Pro-karyotic" = "Pro-blem" (no nucleus), "Eu-karyotic" = "Eu-reka!" (has a nucleus)
The key difference isn't just size - it's all about organisation. Eukaryotic cells are like well-organised offices with separate departments, whilst prokaryotic cells are more like open-plan spaces where everything happens together.
2
of 7Sign up to see the content. It's free!
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Specialised Cells for Reproduction
Your body contains hundreds of different cell types, but sperm and egg cells are probably the most specialised you'll study. These cells have one job: create the next generation.
Sperm cells are basically tiny biological missiles designed to deliver male DNA. The acrosome (tip) contains enzymes that literally digest through the egg's membrane. The middle section is packed with mitochondria for energy, whilst the long tail acts as a propeller for swimming.
Egg cells are the complete opposite - they're huge, stationary, and loaded with nutrients. The cytoplasm contains everything needed to nourish a developing embryo. After fertilisation, the cell membrane completely changes structure to block any other sperm from entering.
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3
of 7Sign up to see the content. It's free!
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Essential Cell Structures
Every cell needs certain basic components to function, regardless of whether it's from your skin, a plant leaf, or a bacterial colony. Think of these as the essential "furniture" that every cell must have.
The nucleus acts like the cell's library and control centre, storing all the genetic material (DNA) that determines what the cell does. The cell membrane is basically a selective bouncer, deciding what gets in and what stays out.
Cytoplasm might look like just watery stuff, but it's where most of the cell's chemistry happens. Mitochondria are the powerhouses, breaking down glucose to release energy through aerobic respiration. Ribosomes are tiny protein factories, reading genetic instructions to build the proteins the cell needs.
Exam Tip: Learn these five structures first - they appear in almost every cell biology question you'll face!
Understanding these basic components gives you the foundation for grasping how more complex cellular processes work. Each structure has evolved to perform specific, essential functions that keep the cell alive and functioning.
4
of 7Sign up to see the content. It's free!
- Access to all documents
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Plant vs Animal Cell Differences
While animal and plant cells share the basic structures, plant cells have some extra features that help them survive as stationary organisms that make their own food.
The cell wall made of cellulose provides structural support - imagine it as scaffolding around a building. Since plants can't move away from danger, they need this extra protection and support that animal cells simply don't require.
Chloroplasts are where the magic of photosynthesis happens, containing chlorophyll that captures sunlight energy. The permanent vacuole stores cell sap and helps maintain the plant's structure by keeping cells rigid when full of water.
Memory Trick: Plants have "extra" structures (wall, chloroplasts, vacuole) because they live an "extra" challenging lifestyle - stuck in one spot!
Animal cells are more flexible and mobile, which is why they don't need rigid cell walls. Instead, they rely on their flexible cell membranes and can change shape as needed for movement and other functions.
5
of 7Sign up to see the content. It's free!
- Access to all documents
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Transport and Cell Division
Cells constantly need to move substances in and out, and they use three main methods depending on what they're transporting. Diffusion is the simplest - particles naturally spread from crowded areas to less crowded ones, like perfume spreading across a room.
Osmosis is specifically about water movement through partially permeable membranes, always flowing from areas with more water to areas with less water. Active transport is different because it requires energy to move substances against their natural flow - like pushing water uphill.
Mitosis is how cells create exact copies of themselves. The process involves the DNA condensing into visible chromosomes, lining up in the middle, then being pulled apart to create two identical daughter cells.
Key Point: Active transport is the only method that requires energy - remember this for your exams!
These processes are absolutely fundamental to life. Without efficient transport systems and cell division, multicellular organisms like humans simply couldn't exist or grow.
6
of 7Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Cell Specialisation and Differentiation
Stem cells are like biological blank canvases that can transform into any type of specialised cell the body needs. Through differentiation, these cells develop specific features that make them perfect for particular jobs.
Sperm cells are built for speed and penetration, with mitochondria for energy and enzymes to break through egg membranes. Muscle cells are long and packed with mitochondria to contract powerfully. Nerve cells are incredibly long with branched ends to carry electrical signals across your body.
Plant cells show amazing specialisation too. Root hair cells have massive surface areas for absorbing water and minerals. Palisade cells are stuffed with chloroplasts to maximise photosynthesis in leaves.
Think About It: Every specialised cell sacrifices some abilities to become really good at one specific function - it's nature's version of career specialisation!
Xylem and phloem cells form the plant's transport system - xylem carries water upwards whilst phloem moves sugars around the plant. Understanding these specialisations helps explain how complex organisms function so efficiently.
7
of 7Sign up to see the content. It's free!
- Access to all documents
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Plant Transport Systems
Plants face a unique challenge - they need to move water from their roots to their highest leaves, sometimes over 100 metres high in giant trees. Root hair cells start this process with their enormous surface area that acts like a massive sponge.
Palisade cells in leaves are the photosynthesis specialists, packed with chloroplasts positioned to catch maximum sunlight. These cells produce the sugars that need transporting around the plant.
The plant's transport highways are xylem and phloem vessels. Xylem cells are actually dead, forming hollow tubes perfect for water transport from roots upward. Phloem cells remain alive and use sieve tubes with companion cells to actively transport sugars and amino acids to wherever the plant needs them.
Amazing Fact: The transport system in a single tree moves thousands of litres of water every day - that's more efficient than most human-made pumping systems!
This transport network is so efficient that it can move materials from the deepest roots to the highest branches, keeping every cell in a massive plant properly supplied with water and nutrients.
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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Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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