Understanding how cells work, divide, and transport materials is fundamental... Show more
Biology155 views·Updated May 29, 2026·3 pagesUnderstanding B1 Cells: Structure, Division, and Transport
Jess Tucker@jesstucker28
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Cell Structure and Specialisation
Every cell in your body started as a basic unit but developed special features to do specific jobs - this is called cell differentiation. Nerve cells grow long axons to carry electrical signals across your body, whilst muscle cells pack in protein filaments for contraction and movement.
Animal cells contain several key structures you need to know. The nucleus controls everything and contains DNA, whilst mitochondria release energy through respiration. The cell membrane acts like a bouncer, controlling what enters and leaves the cell, and cytoplasm is where most chemical reactions happen.
Plant cells have everything animal cells do, plus some extras. The cell wall made of cellulose provides strength, chloroplasts containing chlorophyll carry out photosynthesis, and a large vacuole keeps the cell rigid with cell sap.
Remember: Use the formula magnification = image size ÷ actual size when calculating microscope work!
The main difference between eukaryotes (animal and plant cells) and prokaryotes (bacteria) is that bacteria have free-flowing DNA and no proper nucleus or mitochondria.
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Cell Division and Stem Cells
Your body constantly grows and repairs itself through mitosis - a type of cell division that creates identical copies. The cell cycle has three main stages: growth (where the cell gets bigger and DNA copies itself), mitosis (where chromosomes split apart), and finally the cell splits into two identical daughter cells.
Chromosomes are basically long, coiled strands of DNA that come in pairs. Humans have 23 pairs (46 total) in every body cell, and they contain thousands of genes that determine your characteristics.
Stem cells are the ultimate multi-tool of biology - they haven't specialised yet so can become any type of cell your body needs. Embryonic stem cells from very early embryos are the most flexible and show promise for treating conditions like diabetes and paralysis.
Key Point: Adult stem cells are more limited - bone marrow stem cells only make blood cells, brain stem cells only make brain tissue.
Plant stem cells called meristem cells work similarly and can help create disease-resistant crops or save endangered plant species. Understanding stem cells is crucial for modern medical treatments and agricultural advances.
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Transport in Cells
Cells constantly move materials in and out through three main processes. Diffusion is the simplest - particles naturally spread from areas of high concentration to low concentration, like perfume spreading across a room.
Osmosis specifically deals with water movement across partially permeable membranes. Water always moves towards areas with more dissolved substances (higher concentration). This explains why plant cells stay rigid and why putting salt on slugs isn't very kind!
Sometimes cells need to work against the natural flow, which requires active transport. This process uses energy from respiration to move substances from low to high concentration - like pushing water uphill.
Exam Tip: In the potato practical, if the mass increases, water moved in by osmosis. If it decreases, water moved out!
Several features speed up these transport processes. Large surface areas (like root hairs or lung alveoli), thin membranes, short diffusion pathways, and good blood supplies all make transport more efficient. Plants use root hairs for maximum soil contact, whilst your lungs have millions of tiny alveoli for gas exchange.
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Biology155 views·Updated May 29, 2026·3 pagesUnderstanding B1 Cells: Structure, Division, and Transport
Jess Tucker@jesstucker28
Understanding how cells work, divide, and transport materials is fundamental to biology. These processes explain everything from how your body grows and repairs itself to how plants absorb nutrients from soil.
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Cell Structure and Specialisation
Every cell in your body started as a basic unit but developed special features to do specific jobs - this is called cell differentiation. Nerve cells grow long axons to carry electrical signals across your body, whilst muscle cells pack in protein filaments for contraction and movement.
Animal cells contain several key structures you need to know. The nucleus controls everything and contains DNA, whilst mitochondria release energy through respiration. The cell membrane acts like a bouncer, controlling what enters and leaves the cell, and cytoplasm is where most chemical reactions happen.
Plant cells have everything animal cells do, plus some extras. The cell wall made of cellulose provides strength, chloroplasts containing chlorophyll carry out photosynthesis, and a large vacuole keeps the cell rigid with cell sap.
Remember: Use the formula magnification = image size ÷ actual size when calculating microscope work!
The main difference between eukaryotes (animal and plant cells) and prokaryotes (bacteria) is that bacteria have free-flowing DNA and no proper nucleus or mitochondria.
2
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
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Cell Division and Stem Cells
Your body constantly grows and repairs itself through mitosis - a type of cell division that creates identical copies. The cell cycle has three main stages: growth (where the cell gets bigger and DNA copies itself), mitosis (where chromosomes split apart), and finally the cell splits into two identical daughter cells.
Chromosomes are basically long, coiled strands of DNA that come in pairs. Humans have 23 pairs (46 total) in every body cell, and they contain thousands of genes that determine your characteristics.
Stem cells are the ultimate multi-tool of biology - they haven't specialised yet so can become any type of cell your body needs. Embryonic stem cells from very early embryos are the most flexible and show promise for treating conditions like diabetes and paralysis.
Key Point: Adult stem cells are more limited - bone marrow stem cells only make blood cells, brain stem cells only make brain tissue.
Plant stem cells called meristem cells work similarly and can help create disease-resistant crops or save endangered plant species. Understanding stem cells is crucial for modern medical treatments and agricultural advances.
3
of 3Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
Transport in Cells
Cells constantly move materials in and out through three main processes. Diffusion is the simplest - particles naturally spread from areas of high concentration to low concentration, like perfume spreading across a room.
Osmosis specifically deals with water movement across partially permeable membranes. Water always moves towards areas with more dissolved substances (higher concentration). This explains why plant cells stay rigid and why putting salt on slugs isn't very kind!
Sometimes cells need to work against the natural flow, which requires active transport. This process uses energy from respiration to move substances from low to high concentration - like pushing water uphill.
Exam Tip: In the potato practical, if the mass increases, water moved in by osmosis. If it decreases, water moved out!
Several features speed up these transport processes. Large surface areas (like root hairs or lung alveoli), thin membranes, short diffusion pathways, and good blood supplies all make transport more efficient. Plants use root hairs for maximum soil contact, whilst your lungs have millions of tiny alveoli for gas exchange.
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?
You can download the app from Google Play Store and Apple App Store.
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.
Similar content
Most popular content: Stem Cells
9Most popular content in Biology
9Most popular content
9Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
4.6/5App Store
4.7/5Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan SiOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha KlichAndroid user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
AnnaiOS user