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Biology1,285 views·Updated 31 Aug 2026·15 pages
Learn the difference between anabolic and catabolic reactions in metabolism with cool examples and easy notes. Discover how enzymes, like tiny helpers, make these reactions happen and why they're so important in our bodies. We'll also dive into the amazing phospholipid bilayer and its structure and role in cells. Perfect for curious kids!
Metabolic pathways, controlled by enzymes, can be reversible or use alternative routes.
Example: Anaerobic respiration: glucose → pyruvate → lactate (in the absence of oxygen)
Example: Fermentation in plants/yeast: glucose → pyruvate → ethanol + CO₂
Alternative routes may bypass certain stages in a pathway.
Highlight: The flexibility of metabolic pathways allows cells to adapt to different environmental conditions and energy needs.
Membranes play a crucial role in cellular organization and function.
Definition: The plasma membrane separates the cell from its environment, while other membranes divide eukaryotic cells into specialized compartments.
The phospholipid bilayer structure forms the basis of cellular membranes, with embedded proteins serving various functions:
Highlight: The phospholipid bilayer function and structure is essential for maintaining cellular organization and facilitating various biochemical processes.
Mitochondria and chloroplasts have specialized membrane structures:
Highlight: The folded inner membranes increase surface area, enhancing reaction rates and substrate concentration.
Chemical reactions involve building or breaking down molecules. Activation energy (Ea) is required for a reaction to occur.
Definition: Enzymes lower the activation energy needed for a reaction, allowing biochemical reactions to proceed rapidly at relatively low temperatures.
Highlight: The role of enzymes in metabolic pathways is crucial for maintaining efficient cellular processes at physiological temperatures.
Enzymes play a vital role in metabolic pathways by catalyzing reactions.
Highlight: The active site of an enzyme is flexible, not rigid.
When a substrate binds to the active site, it changes slightly, improving the fit between the enzyme and substrate. This is known as induced fit.
Definition: Affinity refers to the tendency of the substrate to bind with the active site.
Highlight: The flexibility and specificity of enzyme active sites contribute to the efficiency of metabolic enzymes.
Inhibitors are substances that decrease the rate of enzyme-controlled reactions. There are three main types of inhibition:
Definition: Competitive inhibitors have a similar shape to the substrate molecule and compete for the active site on the enzyme.
This type of inhibition can be overcome by increasing substrate concentration.
Definition: Non-competitive inhibitors bind away from the active site but change the shape of the active site, preventing substrate binding.
This type of inhibition cannot be reversed by increasing substrate concentration.
Highlight: Understanding enzyme inhibition is crucial for comprehending the regulation of metabolic pathways and developing therapeutic interventions.
Feedback inhibition is a regulatory mechanism in metabolic pathways.
Definition: As the concentration of the end product builds up, some of it binds to an enzyme earlier in the pathway, slowing down the reaction and preventing further synthesis of the end product.
This mechanism helps maintain homeostasis in cellular metabolism.
Highlight: Feedback inhibition is a key regulatory mechanism in anabolic and catabolic reactions in metabolism.
Cellular respiration is a series of metabolic pathways that release energy from food, producing ATP.
Definition: ATP (Adenosine Triphosphate) is the energy currency of the cell.
When the bond between ADP and phosphate is broken, energy is released.
Definition: Phosphorylation is an enzyme-controlled reaction where a phosphate group is added to a molecule.
ATP plays a crucial role in phosphorylation reactions throughout cellular metabolism.
Highlight: Understanding ATP production and utilization is essential for comprehending energy flow in anabolic and catabolic reactions in metabolism.
Glycolysis is the first stage of cellular respiration, occurring in the cytoplasm.
Highlight: Glycolysis does not require oxygen (anaerobic) and is enzyme-controlled.
Glycolysis consists of two phases:
Example: The net gain of ATP in glycolysis is 2 molecules.
Vocabulary: Dehydrogenase enzymes remove hydrogen ions and electrons from molecules, passing them to coenzyme NAD to form NADH.
If oxygen is present, pyruvate progresses to the citric acid cycle.
Highlight: Glycolysis is a fundamental process in both anabolic and catabolic reactions in metabolism, providing energy and intermediates for various cellular processes.
The citric acid cycle, also known as the Krebs cycle, is the second stage of cellular respiration.
Metabolism encompasses all reactions within a cell, divided into anabolic (build-up) and catabolic (breakdown) processes.
Definition: Anabolic reactions build complex molecules from simple building blocks, requiring energy. An example is protein synthesis.
Definition: Catabolic reactions break down complex molecules into simple building blocks, releasing energy. An example is aerobic respiration.
These reactions are linked, as the energy generated by catabolic reactions enables anabolic reactions to occur.
Highlight: Anabolic and catabolic reactions in metabolism are interconnected, forming the basis of cellular energy management.
Combined ScienceComprehensive overview of BTEC Level 3 Applied Science, covering essential concepts, assessment criteria, and key topics for success in Unit 1. Ideal for students preparing for exams and coursework.
BiologyExplore the intricate processes of ATP production and cellular respiration, including glycolysis, the Krebs cycle, and oxidative phosphorylation. This detailed mind map covers key concepts such as the electron transport chain, substrate-level phosphorylation, and energy yield in aerobic and anaerobic conditions. Ideal for A Level Biology students preparing for exams.
BiologyComprehensive 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.
BiologyExplore 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.
BiologyComprehensive study notes covering key concepts in cellular biology, human digestion, respiration, photosynthesis, and the circulatory system. This resource includes detailed explanations of cell structures, enzyme functions, nutrient absorption, and the impact of environmental factors on biological processes. Ideal for students preparing for Biology Paper 1 exams.
Biologyall notes
BiologyComprehensive study notes covering key concepts in AQA A-Level Biology Year 2, including neuronal communication, genetic modification, nutrient cycles, and hormonal control. This resource is designed to aid understanding of complex topics such as action potentials, photosynthesis, and speciation. Ideal for exam preparation and revision.
BiologyPages from the revision guide summarised in a set of words and a brief explanation
BiologyKS3 Biology revision document.
BiologyComprehensive summary of key concepts in GCSE AQA Biology Paper 1, covering topics such as cell structure, photosynthesis, respiration, disease biology, antibiotic resistance, and transport systems. Ideal for exam preparation and revision.
BiologyExplore the structure and function of the human heart in this detailed overview. Understand the double circulatory system, the flow of oxygenated and deoxygenated blood, and the significance of heart valves and chambers. Ideal for GCSE AQA Biology students, this summary covers key concepts essential for mastering heart physiology.
SociologyDive 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.
SociologyExplore 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.
BiologyComprehensive 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.
BiologyExplore 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.
MathsExplore essential mathematical concepts including powers, geometry, statistics, and probability. This resource features 65 pages of detailed explanations, diagrams, and examples to enhance your understanding of topics such as right triangles, volume calculations, and data representation. Ideal for students seeking to strengthen their numeracy skills and grasp complex mathematical principles.
SociologyExplore 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.
CriminologyExplore key concepts in criminal justice, including the trial process, roles of court personnel, types of offenses, and evidence handling. This comprehensive summary covers essential topics such as jury strengths and weaknesses, the role of the CPS, and the impact of media on trials. Ideal for students preparing for assessments in criminology. Achieved a B grade.
BiologyComprehensive study notes covering key concepts in cellular biology, human digestion, respiration, photosynthesis, and the circulatory system. This resource includes detailed explanations of cell structures, enzyme functions, nutrient absorption, and the impact of environmental factors on biological processes. Ideal for students preparing for Biology Paper 1 exams.
English LiteratureExplore 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.
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.
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.
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.
Biology1,285 views·Updated 31 Aug 2026·15 pagesLearn the difference between anabolic and catabolic reactions in metabolism with cool examples and easy notes. Discover how enzymes, like tiny helpers, make these reactions happen and why they're so important in our bodies. We'll also dive into the amazing phospholipid bilayer and its structure and role in cells. Perfect for curious kids!
By signing up you accept Terms of Service and Privacy Policy
Metabolic pathways, controlled by enzymes, can be reversible or use alternative routes.
Example: Anaerobic respiration: glucose → pyruvate → lactate (in the absence of oxygen)
Example: Fermentation in plants/yeast: glucose → pyruvate → ethanol + CO₂
Alternative routes may bypass certain stages in a pathway.
Highlight: The flexibility of metabolic pathways allows cells to adapt to different environmental conditions and energy needs.
By signing up you accept Terms of Service and Privacy Policy
Membranes play a crucial role in cellular organization and function.
Definition: The plasma membrane separates the cell from its environment, while other membranes divide eukaryotic cells into specialized compartments.
The phospholipid bilayer structure forms the basis of cellular membranes, with embedded proteins serving various functions:
Highlight: The phospholipid bilayer function and structure is essential for maintaining cellular organization and facilitating various biochemical processes.
By signing up you accept Terms of Service and Privacy Policy
Mitochondria and chloroplasts have specialized membrane structures:
Highlight: The folded inner membranes increase surface area, enhancing reaction rates and substrate concentration.
Chemical reactions involve building or breaking down molecules. Activation energy (Ea) is required for a reaction to occur.
Definition: Enzymes lower the activation energy needed for a reaction, allowing biochemical reactions to proceed rapidly at relatively low temperatures.
Highlight: The role of enzymes in metabolic pathways is crucial for maintaining efficient cellular processes at physiological temperatures.
By signing up you accept Terms of Service and Privacy Policy
Enzymes play a vital role in metabolic pathways by catalyzing reactions.
Highlight: The active site of an enzyme is flexible, not rigid.
When a substrate binds to the active site, it changes slightly, improving the fit between the enzyme and substrate. This is known as induced fit.
Definition: Affinity refers to the tendency of the substrate to bind with the active site.
Highlight: The flexibility and specificity of enzyme active sites contribute to the efficiency of metabolic enzymes.
By signing up you accept Terms of Service and Privacy Policy
Inhibitors are substances that decrease the rate of enzyme-controlled reactions. There are three main types of inhibition:
Definition: Competitive inhibitors have a similar shape to the substrate molecule and compete for the active site on the enzyme.
This type of inhibition can be overcome by increasing substrate concentration.
Definition: Non-competitive inhibitors bind away from the active site but change the shape of the active site, preventing substrate binding.
This type of inhibition cannot be reversed by increasing substrate concentration.
Highlight: Understanding enzyme inhibition is crucial for comprehending the regulation of metabolic pathways and developing therapeutic interventions.
By signing up you accept Terms of Service and Privacy Policy
Feedback inhibition is a regulatory mechanism in metabolic pathways.
Definition: As the concentration of the end product builds up, some of it binds to an enzyme earlier in the pathway, slowing down the reaction and preventing further synthesis of the end product.
This mechanism helps maintain homeostasis in cellular metabolism.
Highlight: Feedback inhibition is a key regulatory mechanism in anabolic and catabolic reactions in metabolism.
By signing up you accept Terms of Service and Privacy Policy
Cellular respiration is a series of metabolic pathways that release energy from food, producing ATP.
Definition: ATP (Adenosine Triphosphate) is the energy currency of the cell.
When the bond between ADP and phosphate is broken, energy is released.
Definition: Phosphorylation is an enzyme-controlled reaction where a phosphate group is added to a molecule.
ATP plays a crucial role in phosphorylation reactions throughout cellular metabolism.
Highlight: Understanding ATP production and utilization is essential for comprehending energy flow in anabolic and catabolic reactions in metabolism.
By signing up you accept Terms of Service and Privacy Policy
Glycolysis is the first stage of cellular respiration, occurring in the cytoplasm.
Highlight: Glycolysis does not require oxygen (anaerobic) and is enzyme-controlled.
Glycolysis consists of two phases:
Example: The net gain of ATP in glycolysis is 2 molecules.
Vocabulary: Dehydrogenase enzymes remove hydrogen ions and electrons from molecules, passing them to coenzyme NAD to form NADH.
If oxygen is present, pyruvate progresses to the citric acid cycle.
Highlight: Glycolysis is a fundamental process in both anabolic and catabolic reactions in metabolism, providing energy and intermediates for various cellular processes.
By signing up you accept Terms of Service and Privacy Policy
The citric acid cycle, also known as the Krebs cycle, is the second stage of cellular respiration.
By signing up you accept Terms of Service and Privacy Policy
Metabolism encompasses all reactions within a cell, divided into anabolic (build-up) and catabolic (breakdown) processes.
Definition: Anabolic reactions build complex molecules from simple building blocks, requiring energy. An example is protein synthesis.
Definition: Catabolic reactions break down complex molecules into simple building blocks, releasing energy. An example is aerobic respiration.
These reactions are linked, as the energy generated by catabolic reactions enables anabolic reactions to occur.
Highlight: Anabolic and catabolic reactions in metabolism are interconnected, forming the basis of cellular energy management.
Combined ScienceComprehensive overview of BTEC Level 3 Applied Science, covering essential concepts, assessment criteria, and key topics for success in Unit 1. Ideal for students preparing for exams and coursework.
BiologyExplore the intricate processes of ATP production and cellular respiration, including glycolysis, the Krebs cycle, and oxidative phosphorylation. This detailed mind map covers key concepts such as the electron transport chain, substrate-level phosphorylation, and energy yield in aerobic and anaerobic conditions. Ideal for A Level Biology students preparing for exams.
BiologyComprehensive 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.
BiologyExplore 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.
BiologyComprehensive study notes covering key concepts in cellular biology, human digestion, respiration, photosynthesis, and the circulatory system. This resource includes detailed explanations of cell structures, enzyme functions, nutrient absorption, and the impact of environmental factors on biological processes. Ideal for students preparing for Biology Paper 1 exams.
Biologyall notes
BiologyComprehensive study notes covering key concepts in AQA A-Level Biology Year 2, including neuronal communication, genetic modification, nutrient cycles, and hormonal control. This resource is designed to aid understanding of complex topics such as action potentials, photosynthesis, and speciation. Ideal for exam preparation and revision.
BiologyPages from the revision guide summarised in a set of words and a brief explanation
BiologyKS3 Biology revision document.
BiologyComprehensive summary of key concepts in GCSE AQA Biology Paper 1, covering topics such as cell structure, photosynthesis, respiration, disease biology, antibiotic resistance, and transport systems. Ideal for exam preparation and revision.
BiologyExplore the structure and function of the human heart in this detailed overview. Understand the double circulatory system, the flow of oxygenated and deoxygenated blood, and the significance of heart valves and chambers. Ideal for GCSE AQA Biology students, this summary covers key concepts essential for mastering heart physiology.
SociologyDive 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.
SociologyExplore 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.
BiologyComprehensive 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.
BiologyExplore 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.
MathsExplore essential mathematical concepts including powers, geometry, statistics, and probability. This resource features 65 pages of detailed explanations, diagrams, and examples to enhance your understanding of topics such as right triangles, volume calculations, and data representation. Ideal for students seeking to strengthen their numeracy skills and grasp complex mathematical principles.
SociologyExplore 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.
CriminologyExplore key concepts in criminal justice, including the trial process, roles of court personnel, types of offenses, and evidence handling. This comprehensive summary covers essential topics such as jury strengths and weaknesses, the role of the CPS, and the impact of media on trials. Ideal for students preparing for assessments in criminology. Achieved a B grade.
BiologyComprehensive study notes covering key concepts in cellular biology, human digestion, respiration, photosynthesis, and the circulatory system. This resource includes detailed explanations of cell structures, enzyme functions, nutrient absorption, and the impact of environmental factors on biological processes. Ideal for students preparing for Biology Paper 1 exams.
English LiteratureExplore 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.
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.
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.
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.
