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Britain & the wider world: 1745 -1901
1l the quest for political stability: germany, 1871-1991
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2d religious conflict and the church in england, c1529-c1570
2o democracy and nazism: germany, 1918-1945
1f industrialisation and the people: britain, c1783-1885
1c the tudors: england, 1485-1603
2m wars and welfare: britain in transition, 1906-1957
World war two & the holocaust
2n revolution and dictatorship: russia, 1917-1953
2s the making of modern britain, 1951-2007
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Biology
11 Dec 2025
6,954
13 pages
Emilee Hanna @emileehanna_
Enzymes are biological catalysts that play a crucial role in metabolic processes. This guide explores their structure, function,... Show more
This page delves into the composition of enzymes, their production in cells, and the importance of the active site in enzyme function.
Enzymes are proteins composed of long chains of amino acids. The specific order of these amino acids determines the enzyme's 3D shape, which is crucial for its function.
Vocabulary Active site - A specific region of an enzyme where the substrate binds.
Enzymes are produced in living cells through protein synthesis in ribosomes. They may undergo modifications in the rough endoplasmic reticulum (RER) or Golgi body before being secreted if necessary.
Highlight Enzymes allow reactions to occur quickly at lower temperatures that do not damage the cell.
The active site of an enzyme is where substrate molecules bind. This specific region is key to the enzyme's catalytic activity.
This page explores the importance of enzyme shape and how environmental factors can affect enzyme function.
The shape of an enzyme is determined by its amino acid sequence and the bonds between atoms in these molecules. This specific 3D shape is crucial for the enzyme's function.
Highlight Environmental conditions such as temperature and pH can affect the bonds that maintain an enzyme's shape.
If the shape of the active site changes, it can render the enzyme unable to catalyze its specific reaction. This process is called denaturation and can be irreversible.
Example Heat or extreme pH changes can denature enzymes, altering their shape and rendering them inactive.
Enzymes have optimum working conditions, and maintaining these conditions is essential for their proper function.
This page explains the concept of activation energy and how enzymes lower this energy barrier to facilitate reactions.
Definition Activation energy is the energy required to initiate a metabolic reaction.
Enzymes lower activation energy by bringing substrate molecules into the appropriate orientation, forming an enzyme-substrate complex. This facilitates the formation or breaking of bonds to create products.
Highlight Every chemical reaction has an energy barrier that must be overcome before the reaction can occur.
Enzymes help overcome this barrier by
By lowering the activation energy, enzymes significantly increase the rate of metabolic reactions.
This page discusses two main theories explaining how enzymes interact with their substrates the lock and key hypothesis and the induced fit theory.
Definition Lock and Key Hypothesis - The substrate (key) has a complementary shape to the active site (lock) of the enzyme molecule.
In this model, the enzyme and substrate form a temporary enzyme-substrate complex. Once the reaction occurs, the products leave the active site, freeing it for another substrate molecule.
Definition Induced Fit Theory - The active site's shape is not exactly complementary to the substrate but molds around it upon binding.
The induced fit model suggests that
This model explains how enzymes can be more flexible in their interactions with substrates.
This page explores how enzyme concentration affects the rate of enzymatic reactions.
The turnover rate of an enzyme refers to the number of substrate molecules it can act on in a given time.
Highlight When investigating the effect of a factor on reaction rate, all other factors should be kept constant and at optimum levels.
Increasing enzyme concentration generally results in an increased reaction rate, provided all other factors are kept constant at their optimum levels.
Example At higher enzyme concentrations, reactions are faster because more active sites are available for substrate binding.
However, beyond a certain point, increasing enzyme concentration no longer affects the reaction rate. This occurs when substrate concentration becomes a limiting factor.
The relationship between enzyme concentration and reaction rate is typically represented by a graph showing an initial linear increase followed by a plateau.
Enzymes are essential biological molecules that facilitate chemical reactions in living organisms. This page introduces the fundamental concepts of enzymes and their role in anabolic and catabolic reactions.
Enzymes are biological catalysts that speed up chemical reactions without being permanently changed. They are globular proteins produced in living cells and are highly specific, typically reacting with only one substrate.
Definition Anabolic reactions build up complex compounds from simple ones, forming bonds and requiring energy.
Definition Catabolic reactions break down complex compounds into simpler ones, breaking bonds and releasing energy.
The enzyme-substrate complex formation is crucial for catalyzing reactions. This process involves the collision of the enzyme and substrate at the enzyme's active site.
Highlight Enzymes remain unchanged at the end of the reaction, allowing them to catalyze multiple reactions.
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.
You can download the app from Google Play Store and Apple App Store.
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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Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the essential role of enzymes in biochemical reactions, including their structure, function, and mechanisms of action. This summary covers key concepts such as the active site, enzyme specificity, types of inhibitors, and factors affecting enzyme activity. Ideal for A-Level students seeking a comprehensive overview of enzymatic processes.
BiologyExplore the key concepts of enzyme activity, including examples like catalase, amylase, and trypsin. Understand how temperature, pH, enzyme concentration, and substrate concentration affect reaction rates. This summary covers the Lock & Key and Induced Fit models, emphasizing the role of enzymes as biological catalysts that lower activation energy. Ideal for A-Level Biology students across all exam boards.
BiologyExplore the essential roles of enzymes in biological reactions with this detailed overview. Understand the enzyme-substrate complex, the significance of active sites, and the impact of temperature and pH on enzyme activity. Ideal for biology students seeking to grasp the fundamentals of enzymatic processes.
BiologyExplore the mechanisms of enzyme inhibitors, focusing on competitive and non-competitive inhibition. This summary covers key concepts such as the active site, allosteric site, and the enzyme-substrate complex, providing insights into how inhibitors affect reaction rates. Ideal for students studying biological molecules.
BiologyExplore the mechanisms of cyanide poisoning and the role of enzymes in biological processes. This study note covers key concepts such as enzyme-substrate interactions, the impact of cyanide on cellular respiration, and the importance of maintaining homeostasis. Ideal for AQA Biology students preparing for exams, this resource includes past paper questions and detailed explanations of enzyme activity and DNA replication.
BiologyExplore the role of enzymes as biological catalysts in digestion, including key digestive enzymes like amylase, proteases, and lipases. Understand how temperature and pH affect enzyme activity and the concept of denaturation. This summary provides essential insights for biology students studying enzyme kinetics and digestion.
BiologyApp Store
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
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 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 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 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 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
Emilee Hanna
@emileehanna_
Enzymes are biological catalysts that play a crucial role in metabolic processes. This guide explores their structure, function, and factors affecting their activity, including temperature and pH. It covers anabolic and catabolic reactions, enzyme-substrate complex formation, and the concept of... Show more
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Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page delves into the composition of enzymes, their production in cells, and the importance of the active site in enzyme function.
Enzymes are proteins composed of long chains of amino acids. The specific order of these amino acids determines the enzyme's 3D shape, which is crucial for its function.
Vocabulary: Active site - A specific region of an enzyme where the substrate binds.
Enzymes are produced in living cells through protein synthesis in ribosomes. They may undergo modifications in the rough endoplasmic reticulum (RER) or Golgi body before being secreted if necessary.
Highlight: Enzymes allow reactions to occur quickly at lower temperatures that do not damage the cell.
The active site of an enzyme is where substrate molecules bind. This specific region is key to the enzyme's catalytic activity.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page explores the importance of enzyme shape and how environmental factors can affect enzyme function.
The shape of an enzyme is determined by its amino acid sequence and the bonds between atoms in these molecules. This specific 3D shape is crucial for the enzyme's function.
Highlight: Environmental conditions such as temperature and pH can affect the bonds that maintain an enzyme's shape.
If the shape of the active site changes, it can render the enzyme unable to catalyze its specific reaction. This process is called denaturation and can be irreversible.
Example: Heat or extreme pH changes can denature enzymes, altering their shape and rendering them inactive.
Enzymes have optimum working conditions, and maintaining these conditions is essential for their proper function.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page explains the concept of activation energy and how enzymes lower this energy barrier to facilitate reactions.
Definition: Activation energy is the energy required to initiate a metabolic reaction.
Enzymes lower activation energy by bringing substrate molecules into the appropriate orientation, forming an enzyme-substrate complex. This facilitates the formation or breaking of bonds to create products.
Highlight: Every chemical reaction has an energy barrier that must be overcome before the reaction can occur.
Enzymes help overcome this barrier by:
By lowering the activation energy, enzymes significantly increase the rate of metabolic reactions.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page discusses two main theories explaining how enzymes interact with their substrates: the lock and key hypothesis and the induced fit theory.
Definition: Lock and Key Hypothesis - The substrate (key) has a complementary shape to the active site (lock) of the enzyme molecule.
In this model, the enzyme and substrate form a temporary enzyme-substrate complex. Once the reaction occurs, the products leave the active site, freeing it for another substrate molecule.
Definition: Induced Fit Theory - The active site's shape is not exactly complementary to the substrate but molds around it upon binding.
The induced fit model suggests that:
This model explains how enzymes can be more flexible in their interactions with substrates.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page explores how enzyme concentration affects the rate of enzymatic reactions.
The turnover rate of an enzyme refers to the number of substrate molecules it can act on in a given time.
Highlight: When investigating the effect of a factor on reaction rate, all other factors should be kept constant and at optimum levels.
Increasing enzyme concentration generally results in an increased reaction rate, provided all other factors are kept constant at their optimum levels.
Example: At higher enzyme concentrations, reactions are faster because more active sites are available for substrate binding.
However, beyond a certain point, increasing enzyme concentration no longer affects the reaction rate. This occurs when substrate concentration becomes a limiting factor.
The relationship between enzyme concentration and reaction rate is typically represented by a graph showing an initial linear increase followed by a plateau.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Enzymes are essential biological molecules that facilitate chemical reactions in living organisms. This page introduces the fundamental concepts of enzymes and their role in anabolic and catabolic reactions.
Enzymes are biological catalysts that speed up chemical reactions without being permanently changed. They are globular proteins produced in living cells and are highly specific, typically reacting with only one substrate.
Definition: Anabolic reactions build up complex compounds from simple ones, forming bonds and requiring energy.
Definition: Catabolic reactions break down complex compounds into simpler ones, breaking bonds and releasing energy.
The enzyme-substrate complex formation is crucial for catalyzing reactions. This process involves the collision of the enzyme and substrate at the enzyme's active site.
Highlight: Enzymes remain unchanged at the end of the reaction, allowing them to catalyze multiple reactions.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
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.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
746
Smart Tools NEW
Transform this note into: ✓ 50+ Practice Questions ✓ Interactive Flashcards ✓ Full Mock Exam ✓ Essay Outlines
Explore the essential role of enzymes in biochemical reactions, including their structure, function, and mechanisms of action. This summary covers key concepts such as the active site, enzyme specificity, types of inhibitors, and factors affecting enzyme activity. Ideal for A-Level students seeking a comprehensive overview of enzymatic processes.
BiologyExplore the key concepts of enzyme activity, including examples like catalase, amylase, and trypsin. Understand how temperature, pH, enzyme concentration, and substrate concentration affect reaction rates. This summary covers the Lock & Key and Induced Fit models, emphasizing the role of enzymes as biological catalysts that lower activation energy. Ideal for A-Level Biology students across all exam boards.
BiologyExplore the essential roles of enzymes in biological reactions with this detailed overview. Understand the enzyme-substrate complex, the significance of active sites, and the impact of temperature and pH on enzyme activity. Ideal for biology students seeking to grasp the fundamentals of enzymatic processes.
BiologyExplore the mechanisms of enzyme inhibitors, focusing on competitive and non-competitive inhibition. This summary covers key concepts such as the active site, allosteric site, and the enzyme-substrate complex, providing insights into how inhibitors affect reaction rates. Ideal for students studying biological molecules.
BiologyExplore the mechanisms of cyanide poisoning and the role of enzymes in biological processes. This study note covers key concepts such as enzyme-substrate interactions, the impact of cyanide on cellular respiration, and the importance of maintaining homeostasis. Ideal for AQA Biology students preparing for exams, this resource includes past paper questions and detailed explanations of enzyme activity and DNA replication.
BiologyExplore the role of enzymes as biological catalysts in digestion, including key digestive enzymes like amylase, proteases, and lipases. Understand how temperature and pH affect enzyme activity and the concept of denaturation. This summary provides essential insights for biology students studying enzyme kinetics and digestion.
BiologyApp Store
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
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 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 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 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 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
Biología
Sociology