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Dec 13, 2025
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Comprehensive Guide to Cell Structure for Biology Students
E
Emma Grow
@emmagrow_rtao
1 / 10
Cell Structure and Subcellular Components
Your cells are like bustling cities with specialised districts doing different jobs. Ribosomes are the protein factories found in all living things, made of ribosomal RNA and proteins that follow mRNA instructions to build new proteins.
The endoplasmic reticulum (ER) comes in two flavours: rough ER (covered in ribosomes for protein production) and smooth ER (makes lipids and detoxifies nasty substances). Think of the Golgi complex as the cell's post office - it receives proteins from the ER, modifies them, packages them up, and ships them where they need to go.
Mitochondria are your cellular powerhouses with their distinctive double membrane and folded inner structure called cristae. Meanwhile, lysosomes act like cellular recycling centres, using digestive enzymes to break down waste materials.
Key tip: Remember that ribosomes are found in ALL life forms, showing our shared evolutionary heritage!
Plant cells have some unique features too: chloroplasts for photosynthesis, large vacuoles for storage and structure, and plasmodesmata - tiny holes in cell walls that let materials pass between neighbouring cells.
Essential Organelles and Cellular Processes
Prokaryotes (like bacteria) keep things simple with DNA floating freely in a nucleoid region, whilst eukaryotes (plants, animals, fungi) have their DNA safely tucked away in a membrane-bound nucleus. The nucleolus inside the nucleus is where ribosomal RNA gets made.
Chloroplasts contain thylakoids (membrane sacs) that stack into grana where light-dependent reactions happen. The surrounding stroma is where the Calvin cycle takes place. This is where plants convert carbon dioxide into sugar!
The cell's skeleton consists of three main components: microfilaments (made of actin for muscle contraction), microtubules (hollow tubes of tubulin for structural support), and intermediate filaments (permanent structural elements that anchor organelles).
Remember: The endomembrane system connects the nucleus, ER, Golgi, lysosomes, and plasma membrane - they all work together like departments in a company.
Mitochondria run the Krebs cycle and electron transport chain to make ATP, whilst chloroplasts handle photosynthesis through light-dependent reactions and the Calvin cycle.
Cell Size and Surface Area Relationships
Size really does matter when it comes to cells! As cells get bigger, their surface area-to-volume ratio decreases, making it harder to exchange materials with their environment efficiently.
Smaller cells are generally more efficient because they have more surface area relative to their volume. This means nutrients can get in and waste can get out more easily. Large cells face serious challenges - imagine trying to feed a massive crowd through a tiny doorway!
When organisms grow larger, they need cleverer strategies to solve this problem. That's why complex organisms develop specialised exchange surfaces like lungs, gills, or root systems to maximise their surface area.
Quick check: Higher surface area-to-volume ratios = better material exchange across membranes.
This principle explains why cells don't just keep growing indefinitely. Instead, they divide to maintain optimal size, or develop complex internal structures to help with material transport.
Plasma Membrane Structure
The plasma membrane is brilliantly designed using the fluid mosaic model - imagine a flexible sea of moving parts rather than a rigid wall. Phospholipids are amphipathic molecules with water-loving (hydrophilic) heads and water-hating (hydrophobic) tails.
These phospholipids arrange themselves in a bilayer with heads facing outward toward watery environments and tails tucked safely inside. Integral proteins are embedded right into this lipid bilayer, whilst peripheral proteins just hang out on the surface.
Cholesterol molecules wedge themselves between phospholipids to maintain membrane fluidity - crucial for keeping things working properly at different temperatures. Glycoproteins and glycolipids (carbohydrates attached to proteins and lipids) help with cell recognition and communication.
Memory trick: Think of the membrane as a fluid mosaic - all the pieces can move around like tiles that aren't glued down!
The membrane's job is regulating what enters and leaves the cell, acting like a selective bouncer at an exclusive club.
Membrane Permeability and Transport
Selective permeability means your cell membrane is picky about what gets through - and that's exactly what keeps you alive! The structure determines function: small, nonpolar molecules like oxygen and carbon dioxide slip through easily via simple diffusion.
Polar molecules and charged particles need special help getting across. They use facilitated diffusion through protein channels because the hydrophobic tails would reject them. Water molecules can squeeze through in small amounts, but larger polar molecules like glucose need transport proteins.
Cell walls in plants, fungi, and prokaryotes are made of complex carbohydrates (like cellulose in plants) and provide structural support plus an extra permeability barrier. Plant cells stay connected through plasmodesmata despite having cell walls.
Essential point: Molecule size and polarity determine how substances cross membranes - it's all about chemistry!
The combination of phospholipid bilayers and embedded proteins creates this selective permeability, allowing cells to maintain their internal environment whilst exchanging necessary materials with their surroundings.
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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.
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I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
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Brad T
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Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
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The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
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I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
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Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
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This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Comprehensive Guide to Cell Structure for Biology Students
E
Emma Grow
@emmagrow_rtao
Ever wondered how cells stay organised and function properly? This study guide breaks down the fascinating world of cell structure and membrane transport - essential knowledge for understanding how life works at its most basic level. From tiny ribosomes making... Show more
Cell Structure and Subcellular Components
Your cells are like bustling cities with specialised districts doing different jobs. Ribosomes are the protein factories found in all living things, made of ribosomal RNA and proteins that follow mRNA instructions to build new proteins.
The endoplasmic reticulum (ER) comes in two flavours: rough ER (covered in ribosomes for protein production) and smooth ER (makes lipids and detoxifies nasty substances). Think of the Golgi complex as the cell's post office - it receives proteins from the ER, modifies them, packages them up, and ships them where they need to go.
Mitochondria are your cellular powerhouses with their distinctive double membrane and folded inner structure called cristae. Meanwhile, lysosomes act like cellular recycling centres, using digestive enzymes to break down waste materials.
Key tip: Remember that ribosomes are found in ALL life forms, showing our shared evolutionary heritage!
Plant cells have some unique features too: chloroplasts for photosynthesis, large vacuoles for storage and structure, and plasmodesmata - tiny holes in cell walls that let materials pass between neighbouring cells.
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Essential Organelles and Cellular Processes
Prokaryotes (like bacteria) keep things simple with DNA floating freely in a nucleoid region, whilst eukaryotes (plants, animals, fungi) have their DNA safely tucked away in a membrane-bound nucleus. The nucleolus inside the nucleus is where ribosomal RNA gets made.
Chloroplasts contain thylakoids (membrane sacs) that stack into grana where light-dependent reactions happen. The surrounding stroma is where the Calvin cycle takes place. This is where plants convert carbon dioxide into sugar!
The cell's skeleton consists of three main components: microfilaments (made of actin for muscle contraction), microtubules (hollow tubes of tubulin for structural support), and intermediate filaments (permanent structural elements that anchor organelles).
Remember: The endomembrane system connects the nucleus, ER, Golgi, lysosomes, and plasma membrane - they all work together like departments in a company.
Mitochondria run the Krebs cycle and electron transport chain to make ATP, whilst chloroplasts handle photosynthesis through light-dependent reactions and the Calvin cycle.
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Cell Size and Surface Area Relationships
Size really does matter when it comes to cells! As cells get bigger, their surface area-to-volume ratio decreases, making it harder to exchange materials with their environment efficiently.
Smaller cells are generally more efficient because they have more surface area relative to their volume. This means nutrients can get in and waste can get out more easily. Large cells face serious challenges - imagine trying to feed a massive crowd through a tiny doorway!
When organisms grow larger, they need cleverer strategies to solve this problem. That's why complex organisms develop specialised exchange surfaces like lungs, gills, or root systems to maximise their surface area.
Quick check: Higher surface area-to-volume ratios = better material exchange across membranes.
This principle explains why cells don't just keep growing indefinitely. Instead, they divide to maintain optimal size, or develop complex internal structures to help with material transport.
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Plasma Membrane Structure
The plasma membrane is brilliantly designed using the fluid mosaic model - imagine a flexible sea of moving parts rather than a rigid wall. Phospholipids are amphipathic molecules with water-loving (hydrophilic) heads and water-hating (hydrophobic) tails.
These phospholipids arrange themselves in a bilayer with heads facing outward toward watery environments and tails tucked safely inside. Integral proteins are embedded right into this lipid bilayer, whilst peripheral proteins just hang out on the surface.
Cholesterol molecules wedge themselves between phospholipids to maintain membrane fluidity - crucial for keeping things working properly at different temperatures. Glycoproteins and glycolipids (carbohydrates attached to proteins and lipids) help with cell recognition and communication.
Memory trick: Think of the membrane as a fluid mosaic - all the pieces can move around like tiles that aren't glued down!
The membrane's job is regulating what enters and leaves the cell, acting like a selective bouncer at an exclusive club.
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Membrane Permeability and Transport
Selective permeability means your cell membrane is picky about what gets through - and that's exactly what keeps you alive! The structure determines function: small, nonpolar molecules like oxygen and carbon dioxide slip through easily via simple diffusion.
Polar molecules and charged particles need special help getting across. They use facilitated diffusion through protein channels because the hydrophobic tails would reject them. Water molecules can squeeze through in small amounts, but larger polar molecules like glucose need transport proteins.
Cell walls in plants, fungi, and prokaryotes are made of complex carbohydrates (like cellulose in plants) and provide structural support plus an extra permeability barrier. Plant cells stay connected through plasmodesmata despite having cell walls.
Essential point: Molecule size and polarity determine how substances cross membranes - it's all about chemistry!
The combination of phospholipid bilayers and embedded proteins creates this selective permeability, allowing cells to maintain their internal environment whilst exchanging necessary materials with their surroundings.
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We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
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4.9/5
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Google 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 S
iOS 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 Klich
Android 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.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
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 S
iOS 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 Klich
Android 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.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user