Understanding how cells work, divide, and transport materials is fundamental...
Biology155 views·Updated 19 Jun 2026·3 pagesUnderstanding B1 Cells: Structure, Division, and Transport
Jess Tucker@jesstucker28
1 / 3
1
of 3
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 3
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 3
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
9BiologyStem Cells & Mitosis Overview
Explore the fundamentals of stem cells and mitosis in this comprehensive summary. Understand the differences between embryonic and adult stem cells, their applications in medicine, and the cell cycle stages including cytokinesis. This resource is essential for students studying cell biology and regenerative medicine.
111,61740
BiologyGene Expression & Genomics
Explore the intricate processes of gene expression, including transcription, translation, and RNA splicing. Understand the role of mutations, cellular respiration, and the significance of genomic sequencing in human biology. This summary covers essential concepts such as DNA structure, enzyme regulation, and the implications of genetic information in personalized medicine. Ideal for higher human biology students.
S53906
BiologyAQA Biology Paper 1 Overview
Comprehensive summaries covering all key topics for AQA Biology Paper 1, including gas exchange systems, cell structure, cardiovascular diseases, photosynthesis, and the immune response. Ideal for Year 10/11 students preparing for exams.
1024510
BiologyCell Biology Essentials
Explore the key concepts of cell biology, including cell structures, functions, and the cell cycle. This summary covers prokaryotic and eukaryotic cells, the roles of organelles like mitochondria and chloroplasts, and the significance of stem cells. Ideal for AQA Combined Science students seeking a comprehensive overview.
10760
BiologyStem Cells Overview
Explore the types, potency, and applications of stem cells in biology. This summary covers totipotent, pluripotent, and multipotent stem cells, their role in cellular differentiation, and ethical considerations surrounding their use in medical treatments. Ideal for A Level Biology students.
122497
Biologyedexcel biology topic 2
gcse edexcel biology mindmap
111682
BiologyB1~cell biology topic mindmaps
topic mindmap with key information and diagrams from B1~ cell biology
11781
BiologyUnderstanding Stem Cells
Explore the fascinating world of stem cells, including their types, functions, and applications in regenerative medicine. This summary covers embryonic and adult stem cells, their role in cellular differentiation, and ethical considerations surrounding their use. Ideal for GCSE Biology students.
91592
BiologyCell Division & Stem Cells
Explore key concepts of cell division, including mitosis, the cell cycle, and the role of stem cells in growth and differentiation. This summary covers essential topics such as the stages of mitosis, the significance of meristematic tissue in plants, and the implications of stem cell use in medicine. Ideal for GCSE Biology students preparing for exams.
1031713
Most popular content in Biology
9C
BiologyCell Biology and Cell structure
cell structures
93,2520
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3534
BiologyAQA Biology: Key Concepts
Explore essential AQA Biology topics including Photosynthesis, Respiration, Homeostasis, Genetics, and Ecology. This comprehensive knowledge organizer covers key concepts such as energy transfer, hormonal control, and genetic variation, providing a solid foundation for your studies. Ideal for exam preparation and understanding biological processes.
108,794306
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8055
BiologyA-Level Biology Year 1 Overview
Comprehensive summary of AQA A-Level Biology Year 1, covering key topics such as cellular structure, protein synthesis, immune response, gas exchange, and more. Ideal for exam preparation and understanding biological concepts. Includes detailed insights into cellular processes, biological classification, and the circulatory system.
1214,894694
T
BiologyTypes of cells
biology
101,2090
B
BiologyBiology Paper 1 quiz
this is a simple quiz on key knowledge needed for paper 1
102,7765
BiologyBiology paper 1 Summary
Notes for Biology paper 1 contains the full course for AQA higher combined!
104,132106
C
BiologyCells part 1 function of cells.
About cells and function of cells etc.
119861
Most popular content
9
SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8803,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,6782,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8731,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6571,399
C
BiologyCell Biology and Cell structure
cell structures
93,2520
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,434907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,155125
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,761210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,711198
Can'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
Biology155 views·Updated 19 Jun 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.
1
of 3
Sign up to see the content. It's free!
- Access to all documents
- Improve your grades
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
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
- Join milions of students
By signing up you accept Terms of Service and Privacy Policy
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
By signing up you accept Terms of Service and Privacy Policy
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
9BiologyStem Cells & Mitosis Overview
Explore the fundamentals of stem cells and mitosis in this comprehensive summary. Understand the differences between embryonic and adult stem cells, their applications in medicine, and the cell cycle stages including cytokinesis. This resource is essential for students studying cell biology and regenerative medicine.
111,61740
BiologyGene Expression & Genomics
Explore the intricate processes of gene expression, including transcription, translation, and RNA splicing. Understand the role of mutations, cellular respiration, and the significance of genomic sequencing in human biology. This summary covers essential concepts such as DNA structure, enzyme regulation, and the implications of genetic information in personalized medicine. Ideal for higher human biology students.
S53906
BiologyAQA Biology Paper 1 Overview
Comprehensive summaries covering all key topics for AQA Biology Paper 1, including gas exchange systems, cell structure, cardiovascular diseases, photosynthesis, and the immune response. Ideal for Year 10/11 students preparing for exams.
1024510
BiologyCell Biology Essentials
Explore the key concepts of cell biology, including cell structures, functions, and the cell cycle. This summary covers prokaryotic and eukaryotic cells, the roles of organelles like mitochondria and chloroplasts, and the significance of stem cells. Ideal for AQA Combined Science students seeking a comprehensive overview.
10760
BiologyStem Cells Overview
Explore the types, potency, and applications of stem cells in biology. This summary covers totipotent, pluripotent, and multipotent stem cells, their role in cellular differentiation, and ethical considerations surrounding their use in medical treatments. Ideal for A Level Biology students.
122497
Biologyedexcel biology topic 2
gcse edexcel biology mindmap
111682
BiologyB1~cell biology topic mindmaps
topic mindmap with key information and diagrams from B1~ cell biology
11781
BiologyUnderstanding Stem Cells
Explore the fascinating world of stem cells, including their types, functions, and applications in regenerative medicine. This summary covers embryonic and adult stem cells, their role in cellular differentiation, and ethical considerations surrounding their use. Ideal for GCSE Biology students.
91592
BiologyCell Division & Stem Cells
Explore key concepts of cell division, including mitosis, the cell cycle, and the role of stem cells in growth and differentiation. This summary covers essential topics such as the stages of mitosis, the significance of meristematic tissue in plants, and the implications of stem cell use in medicine. Ideal for GCSE Biology students preparing for exams.
1031713
Most popular content in Biology
9C
BiologyCell Biology and Cell structure
cell structures
93,2520
1
Biology1.cells Gcse biology question cards
combined science higher biology
92,3534
BiologyAQA Biology: Key Concepts
Explore essential AQA Biology topics including Photosynthesis, Respiration, Homeostasis, Genetics, and Ecology. This comprehensive knowledge organizer covers key concepts such as energy transfer, hormonal control, and genetic variation, providing a solid foundation for your studies. Ideal for exam preparation and understanding biological processes.
108,794306
T
BiologyThe functions of subcellular structures - B1 Biology
Flashcards on the different functions of subcellular structures: cell membrane, nucleus, mitochondria, ribosomes, cytoplasm, permant vacuole, chloroplasts and cell wall.
102,8055
BiologyA-Level Biology Year 1 Overview
Comprehensive summary of AQA A-Level Biology Year 1, covering key topics such as cellular structure, protein synthesis, immune response, gas exchange, and more. Ideal for exam preparation and understanding biological concepts. Includes detailed insights into cellular processes, biological classification, and the circulatory system.
1214,894694
T
BiologyTypes of cells
biology
101,2090
B
BiologyBiology Paper 1 quiz
this is a simple quiz on key knowledge needed for paper 1
102,7765
BiologyBiology paper 1 Summary
Notes for Biology paper 1 contains the full course for AQA higher combined!
104,132106
C
BiologyCells part 1 function of cells.
About cells and function of cells etc.
119861
Most popular content
9SociologySociology of Education Overview
Explore comprehensive A-Level Sociology notes on the education system, covering key theories, policies, and sociological perspectives. This resource includes insights on marketisation, gender roles, cultural deprivation, and educational inequalities, providing a thorough understanding of how education shapes social stratification and individual achievement. Ideal for exam preparation and in-depth study.
12102,8803,041
SociologySociology of Families: Comprehensive Revision
Dive into an extensive overview of family dynamics, perspectives, and patterns in sociology. This resource covers key concepts such as family diversity, gender roles, marriage, and the impact of social policies on family structures. Perfect for A-Level Sociology students preparing for Paper 2.
1273,6782,307
CriminologyCriminology: Crime & Punishment Overview
Comprehensive mindmaps covering key concepts in the Crime and Punishment topic for WJEC Criminology Unit 4. This resource includes detailed insights into the Criminal Justice System, crime prevention strategies, sentencing models, and the roles of various agencies. Ideal for A-Level revision, ensuring you grasp essential theories and legislative processes to excel in your exams.
1254,8731,059
SociologyComprehensive Crime & Deviance Overview
Explore an extensive revision of crime and deviance topics, including theories, types of crime, and the impact of media. This resource covers key concepts such as Marxism, functionalism, gender and crime, and the influence of globalization on criminal behavior. Ideal for students seeking a thorough understanding of criminology and its various theories. Type: Full Topic Revision.
1251,6571,399
C
BiologyCell Biology and Cell structure
cell structures
93,2520
English LiteratureAn Inspector Calls: Character Insights
Explore in-depth analysis and key quotes for characters in J.B. Priestley's 'An Inspector Calls'. This resource covers Gerald Croft, Inspector Goole, Sheila Birling, Mrs. Birling, Eric Birling, and Eva Smith, focusing on themes of class, gender roles, and social responsibility. Ideal for students aiming for Grade 8 and above.
1025,434907
CriminologyWJEC Unit 4 Criminology
Criminology unit 4 detailed revision note
127,155125
CriminologyCriminology Theories Overview
Explore key criminology theories and their implications on crime and deviance. This comprehensive summary covers biological, psychological, and sociological perspectives, including labelling theory, right realism, and the impact of social campaigns on policy development. Ideal for A-Level criminology students seeking to understand the complexities of criminal behaviour and the factors influencing crime prevention strategies.
129,761210
English LiteratureRomeo and Juliet: Key themes
Key Romeo and Juliet themes and analysed quotes
106,711198
Can'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