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Updated Mar 28, 2026
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Prokaryotic Cell Components and Functions
This page delves deeper into the prokaryotic cell structure and components and functions, providing more detail on each cellular component.
- Cytoplasm: The internal fluid component of the cell.
- Nucleoid: The region of the cytoplasm where DNA is located. In prokaryotes, the DNA is a circular strand called a genophore.
- Plasmids: Autonomous circular DNA molecules that can be transferred between bacteria through horizontal gene transfer.
- Ribosomes: Complexes of RNA and protein responsible for polypeptide synthesis. Prokaryotic ribosomes are 70S in size.
Definition: Horizontal gene transfer is the movement of genetic material between organisms other than by vertical transmission from parent to offspring.
Example: Horizontal gene transfer in prokaryotes can occur through plasmid exchange, allowing bacteria to acquire new traits such as antibiotic resistance.
Prokaryotic Cell Membrane and Wall
This page continues the discussion of prokaryotic cell structure and function, focusing on the cell membrane, cell wall, and external structures.
- Cell Membrane: A semi-permeable and selective barrier surrounding the cell.
- Cell Wall: A rigid outer covering made of peptidoglycan that maintains cell shape and prevents lysis (bursting).
- Slime Capsule: A thick polysaccharide layer that protects against desiccation and phagocytosis.
Vocabulary: Peptidoglycan - A polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of bacterial cells.
Highlight: The cell wall is a crucial difference between archaebacteria and eubacteria. While both have cell walls, the composition differs significantly.
Prokaryotic External Structures
This page completes the overview of prokaryotic cell structure and components, focusing on external structures that aid in movement and attachment.
- Flagella: Long, slender projections containing motor proteins that enable movement. The singular form is flagellum.
- Pili: Hair-like extensions that serve two main functions:
- Attachment pili: Enable adherence to surfaces
- Sex pili: Mediate bacterial conjugation
Example: Horizontal gene transfer in bacteria can occur through conjugation, where genetic material is transferred from one bacterium to another via sex pili.
Highlight: The presence and arrangement of flagella can vary among prokaryotes and is often used as a characteristic for classification.
Comparison of Prokaryotic and Eukaryotic Cells
This page provides a brief comparison between prokaryotic and eukaryotic cells, highlighting key differences in their structure and organization.
While prokaryotes lack a true nucleus and membrane-bound organelles, eukaryotes possess both. This fundamental difference leads to several other distinctions:
- DNA Organization: Prokaryotes have a single circular chromosome in the nucleoid, while eukaryotes have linear chromosomes enclosed in a nuclear membrane.
- Cell Size: Prokaryotic cells are generally smaller than eukaryotic cells.
- Organelles: Eukaryotes have membrane-bound organelles like mitochondria and endoplasmic reticulum, which are absent in prokaryotes.
Definition: Eukaryotic cell diagram would show a nucleus, membrane-bound organelles, and a more complex internal structure compared to a prokaryotic cell diagram.
Highlight: Understanding the differences between archaebacteria and eubacteria as well as the distinctions between prokaryotes and eukaryotes is crucial for comprehending the diversity of life on Earth.
Prokaryotic Cell Structure and Components
This page provides an overview of prokaryotic cell structure and components, focusing on their basic characteristics and classification.
Prokaryotes are defined as organisms whose cells lack a nucleus. They are classified into two main domains:
- Archaebacteria: Found in extreme environments, often called extremophiles.
- Eubacteria: Traditional bacteria, including many pathogenic forms.
The prokaryotic cell structure and components diagram illustrates key features:
- Cell Wall (made of peptidoglycan)
- Cell Membrane
- Cytoplasm
- Nucleoid (containing the genophore)
- Plasmids
- Ribosomes
- Pili
- Flagella
- Slime Capsule (glycocalyx)
Vocabulary: Genophore - The circular DNA strand found in prokaryotes.
Highlight: The term 'prokaryote' comes from Greek, where 'pro' means before and 'karyon' means nucleus, reflecting their lack of a true nucleus.
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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
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Best app on earth! no words because it’s too good
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Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
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This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
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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.
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very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
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I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
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THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. 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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. 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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Explore Cool Cell Stuff: Prokaryotic and Eukaryotic Fun!
roses
@roses4
Prokaryotes are single-celled organisms without a nucleus, classified into Archaebacteria and Eubacteria. Their cellular structure includes a cell wall, cell membrane, cytoplasm, nucleoid, plasmids, ribosomes, and various external structures. These organisms play crucial roles in diverse environments and have unique... Show more
Prokaryotic Cell Components and Functions
This page delves deeper into the prokaryotic cell structure and components and functions, providing more detail on each cellular component.
- Cytoplasm: The internal fluid component of the cell.
- Nucleoid: The region of the cytoplasm where DNA is located. In prokaryotes, the DNA is a circular strand called a genophore.
- Plasmids: Autonomous circular DNA molecules that can be transferred between bacteria through horizontal gene transfer.
- Ribosomes: Complexes of RNA and protein responsible for polypeptide synthesis. Prokaryotic ribosomes are 70S in size.
Definition: Horizontal gene transfer is the movement of genetic material between organisms other than by vertical transmission from parent to offspring.
Example: Horizontal gene transfer in prokaryotes can occur through plasmid exchange, allowing bacteria to acquire new traits such as antibiotic resistance.
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Prokaryotic Cell Membrane and Wall
This page continues the discussion of prokaryotic cell structure and function, focusing on the cell membrane, cell wall, and external structures.
- Cell Membrane: A semi-permeable and selective barrier surrounding the cell.
- Cell Wall: A rigid outer covering made of peptidoglycan that maintains cell shape and prevents lysis (bursting).
- Slime Capsule: A thick polysaccharide layer that protects against desiccation and phagocytosis.
Vocabulary: Peptidoglycan - A polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of bacterial cells.
Highlight: The cell wall is a crucial difference between archaebacteria and eubacteria. While both have cell walls, the composition differs significantly.
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Prokaryotic External Structures
This page completes the overview of prokaryotic cell structure and components, focusing on external structures that aid in movement and attachment.
- Flagella: Long, slender projections containing motor proteins that enable movement. The singular form is flagellum.
- Pili: Hair-like extensions that serve two main functions:
- Attachment pili: Enable adherence to surfaces
- Sex pili: Mediate bacterial conjugation
Example: Horizontal gene transfer in bacteria can occur through conjugation, where genetic material is transferred from one bacterium to another via sex pili.
Highlight: The presence and arrangement of flagella can vary among prokaryotes and is often used as a characteristic for classification.
Sign up to see the contentIt's free!
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Improve your grades
Join milions of students
Comparison of Prokaryotic and Eukaryotic Cells
This page provides a brief comparison between prokaryotic and eukaryotic cells, highlighting key differences in their structure and organization.
While prokaryotes lack a true nucleus and membrane-bound organelles, eukaryotes possess both. This fundamental difference leads to several other distinctions:
- DNA Organization: Prokaryotes have a single circular chromosome in the nucleoid, while eukaryotes have linear chromosomes enclosed in a nuclear membrane.
- Cell Size: Prokaryotic cells are generally smaller than eukaryotic cells.
- Organelles: Eukaryotes have membrane-bound organelles like mitochondria and endoplasmic reticulum, which are absent in prokaryotes.
Definition: Eukaryotic cell diagram would show a nucleus, membrane-bound organelles, and a more complex internal structure compared to a prokaryotic cell diagram.
Highlight: Understanding the differences between archaebacteria and eubacteria as well as the distinctions between prokaryotes and eukaryotes is crucial for comprehending the diversity of life on Earth.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Prokaryotic Cell Structure and Components
This page provides an overview of prokaryotic cell structure and components, focusing on their basic characteristics and classification.
Prokaryotes are defined as organisms whose cells lack a nucleus. They are classified into two main domains:
- Archaebacteria: Found in extreme environments, often called extremophiles.
- Eubacteria: Traditional bacteria, including many pathogenic forms.
The prokaryotic cell structure and components diagram illustrates key features:
- Cell Wall (made of peptidoglycan)
- Cell Membrane
- Cytoplasm
- Nucleoid (containing the genophore)
- Plasmids
- Ribosomes
- Pili
- Flagella
- Slime Capsule (glycocalyx)
Vocabulary: Genophore - The circular DNA strand found in prokaryotes.
Highlight: The term 'prokaryote' comes from Greek, where 'pro' means before and 'karyon' means nucleus, reflecting their lack of a true nucleus.
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.
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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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. 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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
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
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
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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!
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
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. 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 apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user