The locus and linkage, meiosis, differential gene expression and protein transport within cells lessons have been uploaded for free and by downloading these, you will be able to observe the detail of planning that has gone into all of the lessons that are included in this bundle. This intricate planning ensures that the students are engaged and motivated whilst the detailed content of topic 3 (Cell structure, Reproduction and Development) of the Edexcel International A-level Biology specification is covered. The 14 lesson PowerPoints and accompanying resources contain a wide range of activities which cover the following topic 3 specification points: All living organisms are made of cells Cells of multicellular organisms are organised into tissues, organs and organ systems The ultrastructure of eukaryotic cells The function of the organelles in eukaryotic animal cells The role of the RER and Golgi apparatus in protein transport within cells The ultrastructure of prokaryotic cells Magnification and resolution in light and electron microscopes The gene locus is the location of a gene on a chromosome The linkage of genes on a chromosome The role of meiosis in ensuring genetic variation Understand how the mammalian gametes are specialised for their functions The role of mitosis and the cell cycle in growth and asexual reproduction Calculation of mitotic indices The meaning of the terms stem cell, pluripotent, totipotent, morula and blastocyst The decisions that have to be made about the use of stem cells in medical therapies Cells become specialised through differential gene expression One gene can give rise to more than one protein through post-transcriptional changes to mRNA Phenotype is the interaction between genotype and the environment Epigenetic modifications can alter the activation of certain genes Some phenotypes are affected by multiple alleles or by polygenic inheritance Due to the detail included in all of these lessons, it is estimated that it will take in excess of 6 weeks of allocated A-level teaching time to complete the teaching of the bundle

Each of the 12 lessons included in this bundle have been written to specifically cover the content as detailed in topic 8 of the AQA A-level Biology specification (The control of gene expression). The wide range of activities will maintain engagement whilst supporting the explanations of the biological knowledge to allow the students to build a deep understanding of this potentially difficult topic! Lessons which cover the following specification points are included in this bundle: Gene mutations and their effect on the structure of proteins Most of a cell’s DNA is not translated Totipotent, pluripotent, multipotent and unipotent stem cells Regulation of transcription by transcription factors The role of oestrogen in initiating transcription Epigenetic control of gene expression in eukaryotes Inhibition of transcription by increased DNA methylation or decreased acetylation of histones Translation of mRNA can be inhibited by RNA interference The main characteristics of benign and malignant tumours Determining the genome of simpler organisms to determine the proteome and its applications The development of DNA sequencing methods The production of DNA fragments through use of enzymes or a gene machine The role of the PCR to amplify DNA fragments The transfer of DNA into a host cell The use of labelled DNA probes to screen patients for heritable conditions, drug responses and to identify health risks VNTRs The technique of genetic fingerprinting to analyse DNA fragments If you would like to see the quality of the lessons, download the producing DNA fragments and DNA methylation and acetylation lessons as these have been uploaded for free

Normally the first topic to be taught in the second year of the AQA A-level Biology course, topic 5 contains some very important biological processes which include photosynthesis, respiration and energy transfer between organisms. All 17 lessons included in this bundle are highly detailed and have been planned at length to ensure that students remain motivated and engaged whilst being constantly challenged on their current understanding. Links to previously-covered topics are also made throughout the lessons. The following specification points are covered in these lessons: TOPIC 5.1 The light-dependent reaction of photosynthesis The use of reduced NADP and ATP from the light-dependent reaction in the light-independent reaction The light-independent reaction of photosynthesis Environmental factors that limit the rate of photosynthesis TOPIC 5.2 Respiration produces ATP Glycolysis as the first stage of aerobic and anaerobic respiration The conversion of pyruvate to lactate or ethanol in the anaerobic pathways The link reaction and the Krebs cycle Synthesis of ATP by oxidative phosphorylation Other respiratory substrates TOPIC 5.3 Gross primary production and net primary production The net production of consumers Farming practices designed to increase the efficiency of energy transfer TOPIC 5.4 The role of microorganisms in the nitrogen cycle The phosphorus cycle, including the role of saprobionts and mycorrrhizae The use of artificial and natural fertilisers The environmental issues arising from the use of fertilisers including leaching and eutrophication. If you would like to sample the quality of the lessons in this bundle, then download the chloroplast structure, anaerobic respiration, oxidative phosphorylation, GPP and phosphorus cycle lessons as these have been uploaded for free

This bundle contains 18 detailed and engaging lessons which cover the following specification points in module 3 (Exchange and transport) of the OCR A-level Biology A specification: 3.1.1: Exchange surfaces The need for specialised exchange surfaces The features of an efficient exchange surface The structures and functions of the components of the mammalian gaseous exchange system The mechanism of ventilation in mammals The mechanisms of ventilation and gas exchange in bony fish and insects 3.1.2: Transport in animals The double, closed circulatory system in mammals The structure and functions of arteries, arterioles, capillaries, venules and veins The formation of tissue fluid from plasma The external and internal structure of the heart The cardiac cycle How heart action is initiated and coordinated The use and interpretation of ECG traces The role of haemoglobin in transporting oxygen and carbon dioxide The oxygen dissociation curve for foetal and adult haemoglobin 3.1.3: Transport in plants The structure and function of the vascular systems in the roots, stems and leaves The transport of water into the plant, through the plant and to the air surrounding the leaves The mechanism of translocation As well as the detailed A-level Biology content of the PowerPoint slides, the resources contain a wide range of tasks including guided discussion points, exam-style questions and quiz competitions which will engage and motivate the students

This bundle of 10 lessons covers the majority of the content in Topic B1 (Cell-level systems) of the OCR Gateway A GCSE Biology specification. The topics covered within these lessons include: Plant and animal cells Bacterial cells Light microscopy Electron microscopy DNA Transcription and translation Enzymes Enzyme actions Aerobic respiration Anaerobic respiration Photosynthesis Limiting factors All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.

The topics of selection, evolution, biodiversity, classification and conservation are key concepts in Biology, that are regularly assessed in the exams, but are not always that well understood by the students. With this at the forefront of the lesson design, these 16 lesson PowerPoints and their accompanying resources have been intricately planned to cover the detailed content of topics 17 & 18 of the CIE A-level Biology specification through the use of a wide range of tasks to engage and motivate the students. There are plenty of opportunities for the students to assess their current understanding through the completion of exam-style questions and also to check on their prior knowledge by making links to earlier topics. The following specification points are covered by these lessons: Topic 17.1: Variation The differences between continuous and discontinuous variation Using the t-test to compare the variation of two different populations The importance of genetic variation in selection Topic 17.2: Natural and artificial selection Natural selection Explain how environmental factors can act as stabilising, disruptive and directional forces of natural selection Explain how the founder effect and genetic drift may affect allele frequencies in populations Use the Hardy-Weinberg principle Topic 17.3: Evolution The molecular evidence that reveals similarities between closely related organisms Explain how speciation may occur Topic 18.1: Biodiversity Define the terms species, ecosystem and niche Explain that biodiversity is considered at three levels Explain the importance of random sampling in determining the biodiversity of an area Use suitable methods to assess the distribution and abundance of organisms in a local area Use the Spearman’s rank correlation to analyse relationships between data Use Simpson’s index of diversity Topic 18.2: Classification The classification of species into taxonomic hierarchy The characteristic features of the three domains The characteristic features of the kingdoms Explain why viruses are not included in the three domain classification Topic 18.3: Conservation The reasons for the need to maintain biodiversity Methods of protecting endangered species The roles of organisations like the WWF and CITES in local and global conservation If you would like to sample the quality of the lessons that are included in this bundle then download the following as these have been shared for free: Continuous and discontinuous variation Molecular evidence & evolution Spearman’s rank correlation WWF, CITES and conservation It is estimated that it will take up to 2 months of A-level Biology teaching time to cover the detail included in these lessons

This bundle of 14 lessons covers the majority of the content in Topic B6 (Inheritance, Variation and Evolution) of the AQA Trilogy GCSE Combined Science specification. The topics covered within these lessons include: DNA Reproduction Meiosis X and Y chromosomes Genetic diagrams Inherited disorders Variation Evolution Selective breeding Genetic engineering Fossils Antibiotic-resistant bacteria Classification All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.

This bundle of 11 lessons covers the majority of the content in the sub-topic B6.3 (Monitoring and maintaining health) of the OCR Gateway A GCSE Combined Science specification. The topics and specification points covered within these lessons include: The relationship between health and disease Different types of diseases The interactions between different types of diseases The spread of communicable diseases Reducing and preventing the spread of communicable diseases The role of white blood cells and platelets in defence The non-specific defence systems The role of the immune system in the defence against disease The use of vaccines and medicines in the prevention and treatment of disease The discovery and development of potential new medicines Risk factors and non-communicable diseases Treatments for CVD Stem cells in medicine All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.

This bundle of 13 lessons covers the majority of the content in Topic B2 (Scaling Up) of the OCR Gateway A GCSE Combined Science & GCSE Biology specifications. The topics covered within these lessons include: Mitosis Cell differentiation Cell specialisation Stem cells Diffusion Osmosis Active transport Exchange surfaces The heart in the circulatory system The blood and blood vessels Plant transport systems Transpiration All of these lesson presentations and accompanying resources are detailed and engaging and contain regular progress checks to allow the students to constantly assess their understanding.

This bundle contains 17 fully-resourced lessons which have been designed to cover the content as detailed in topic 7 (Run for your life) of the Pearson Edexcel A-Level Biology A (Salters Nuffield) specification. The specification points that are covered within these lessons include: The interaction of muscles, tendons, ligaments and the skeleton in movement The contraction of skeletal muscle by the sliding filament theory The overall reaction of aerobic respiration The enzymes involved in the multi-stepped process of respiration The roles of glycolysis in aerobic and anaerobic respiration The role of the link reaction and the Krebs cycle in the complete oxidation of glucose Understand how ATP is synthesised by oxidative phosphorylation The fate of lactate after a period of anaerobic respiration The myogenic nature of cardiac muscle The coordination of the heart beat The use of ECGs to aid diagnosis Calculating cardiac output The control of heart rate by the medulla oblongata The control of ventilation rate The structure of a muscle fibre The structural and physiological differences between fast and slow twitch muscle fibres The meaning of negative and positive feedback control The principle of negative feedback in maintaining systems within narrow limits The importance of homeostasis to maintain the body in a state of dynamic equilibrium during exercise DNA transcription factors, including hormones The lessons have been planned so that they contain a wide range of activities and numerous understanding and prior knowledge checks so students can assess their progress against the current topic as well as be challenged to make links to other topics within topic 7 and earlier topics If you would like to see the quality of the lessons, download the link reaction and Krebs cycle, the fate of lactate,the using ECGs and transcription factors lessons as these have been uploaded for free

Some of the key biological topics are covered in topic 2 of the Pearson Edexcel A-level Biology A (Salters Nuffield) course and include the transport of materials across cell membranes, DNA structure and replication, protein synthesis and monohybrid inheritance. In line with this, many hours of intricate planning have gone into the design of all of the 19 lessons that are included in this bundle to ensure that the content is covered in detail, understanding is constantly checked to immediately address misconceptions and that engagement is high. This is achieved through the wide variety of tasks in the PowerPoints and accompanying worksheets which include exam-style questions with clear answers, discussion points, differentiated tasks and quick quiz competitions. The following specification points are covered by the lessons within this bundle: The properties of gas exchange surfaces in living organisms Understand how the rate of diffusion is dependent on these properties and can be used in the calculation of the rate of diffusion by Fick’s law Adaptations of the mammalian lung for rapid gaseous exchange Structure and properties of cell membranes Simple and facilitated diffusion as methods of passive transport The involvement of ATP and carrier proteins in active transport, endocytosis and exocytosis The basic structure of mononucleotides The structures of DNA and RNA The process of protein synthesis The roles of the template strand, mRNA and tRNA The nature of the genetic code A gene is a sequence of bases on DNA that codes for the amino acid sequence of a polypeptide The basic structure of an amino acid The formation of polypeptides and proteins The primary, secondary, tertiary and quaternary structure of proteins Globular and fibrous proteins using haemoglobin and collagen as examples The mechanism of action and the specificity of enzymes Enzymes are biological catalysts that reduce activation energy The process of DNA replication Errors in DNA replication can give rise to mutations The meaning of key genetic terms Patterns of inheritance, in the context of monohybrid inheritance Understand how the expression of a gene mutation in people with cystic fibrosis impairs the functioning of the gaseous exchange, digestive and reproductive systems Understand the uses and implications of genetic screening and prenatal testing Due to the detail included in each of these lessons, it is estimated that it will take in excess of 2 months of allocated teaching time to cover the content. If you would like to see the quality of the lessons, download the gas exchange surfaces, cell membranes, transcription, globular and fibrous proteins, monohybrid inheritance and cystic fibrosis lessons as these have been shared for free

This lesson bundle contains 17 detailed and fully-resourced lessons which cover the following specification points in topic 3 of the AQA A-level Biology specification: Topic 3.1 The relationship between the size of an organism or structure and its surface area to volume ratio The development of systems in larger organisms as adaptations that facilitate exchange as this ratio reduces Topic 3.2 Adaptations of gas exchange surfaces as shown by gas exchange in single-celled organisms, insects, bony fish and the leaves of dicotyledonous plants The gross structure of the human gas exchange system The essential features of the alveolar epithelium as a surface over which gas exchange takes place The mechanism of breathing to include the role of the diaphragm and the intercostal muscles Topic 3.3 During digestion, large molecules are hydrolysed to smaller molecules Digestion in mammals by amylases, disaccharidases, lipase, endopeptidases, exopeptidases and dipeptidases Mechanisms for the absorption of the products of digestion by cells lining the ileum of mammals Topic 3.4.1 The structure and role of haemoglobin in the loading, transport and unloading of oxygen The effects of carbon dioxide concentration on the dissociation of oxyhaemoglobin The general pattern of blood circulation in a mammal The gross structure of the human heart Pressure and volume changes and valve movements during the cardiac cycle The structure of the arteries, arterioles and veins The formation of tissue fluid and its return to the circulatory system Topic 3.4.2 Xylem as the tissue that transports water The cohesion-tension theory of water transport Phloem as the tissue that transports organic substances in plants The mass flow hypothesis for the mechanism of translocation in plants If you would like to sample the quality of the lessons included in this bundle, then download the following lessons which have been uploaded for free Alveolar epithelium Absorption in the ileum Arteries, arterioles and veins Formation of tissue fluid Translocation

This bundle of 20 lessons covers the majority of the content that’s included in modules 5.1.1 - 5.1.4 of the OCR A-level Biology A specification. All of the lessons are highly detailed and have been planned at length to ensure that they are filled with a wide range of tasks to engage and motivate the students whilst checking on their understanding. The following specification points are covered by the lessons in this bundle: 5.1.1: Communication and homeostasis The communication between cells by cell signalling The principle of homeostasis The physiological and behavioural responses involved in temperature control in endotherms and ectotherms 5.1.2: Excretion as an example of homeostatic control The functions of the mammalian liver The gross structure and histology of the kidney The processes of ultrafiltration and selective reabsorption The control of the water potential of the blood The effects of kidney failure and its potential treatments 5.1.3: Neuronal communication The roles of mammalian sensory receptors in converting stimuli into nerve impulses The structure and functions of sensory, relay and motor neurones The generation and transmission of nerve impulses in mammals The structures and roles of synapses in transmission 5.1.4: Hormonal communication Endocrine communication by hormones The structure and functions of the adrenal glands The structure of the pancreas The regulation of blood glucose concentration The difference between diabetes mellitus type I and II The potential treatments for diabetes mellitus It is estimated that it will take in excess of 2 months of allocated A-level teaching time to cover the detail included in these lessons If you would like to sample the quality of the lessons in this bundle, then download the following lessons as they have been shared for free: The principles of homeostasis Temperature control in ectotherms The functions of the liver The structure of the kidney The generation and transmission of nerve impulses Endocrine communication

The biological molecules topic is incredibly important, not just because it is found at the start of the course, but also because of its detailed content which must be well understood to promote success with the other 7 AQA A-level Biology topics. Many hours of intricate planning has gone into the design of all of the 20 lessons that are included in this bundle to ensure that the content is covered in detail, understanding is constantly checked and misconceptions addressed and that engagement is high. This is achieved through the wide variety of tasks in the PowerPoints and accompanying worksheets which include exam-style questions with clear answers, discussion points, differentiated tasks and quick quiz competitions. The following specification points are covered by the lessons within this bundle: Monomers and polymers Condensation and hydrolysis reactions Common monosaccharides Maltose, sucrose and lactose The structure and functions of glycogen, starch and cellulose Biochemical tests using Benedict’s solution for reducing sugars and non-reducing sugars and iodine/potassium iodide for starch The structure and properties of triglycerides and phospholipids The emulsion test for lipids The structure of amino acids The formation of dipeptides and polypeptides The levels of protein structure The biuret test for proteins Enzymes act as biological catalysts The induced-fit model of enzyme action The properties of an enzyme The effect of temperature on the rate of an enzyme-controlled reaction The effect of enzyme and substrate concentration on the rate of an enzyme-controlled reaction The effect of competitive and non-competitive inhibitors on the rate of an enzyme-controlled reaction The structure of DNA and RNA The semi-conservative replication of DNA ATP as the universal energy currency The properties of water and its importance in Biology Inorganic ions Due to the detail of each of these lessons, it is estimated that it will take in excess of 2 months of allocated teaching time to cover the content. If you would like to see the quality of the lessons, download the monomers and polymers, polysaccharides, triglycerides, dipeptides and polypeptides and inorganic ions lessons as these have been shared for free

The detailed content, exam-style questions, guided discussion points and quiz competitions that are found in each of the 16 paid lessons that are included in this bundle (as well as the 5 free lessons which are named at the bottom) cover the following specification points in module 4 of the OCR A-level Biology A specification: Module 4.1.1 The different types of pathogen that can cause communicable diseases in plants and animals The means of transmission of animal and plant communicable pathogens The primary non-specific defences against pathogens in animals The structure and mode of action of phagocytes The structure, different roles and modes of action of B and T lymphocytes in the specific immune response The primary and secondary immune responses The structure and general functions of antibodies An outline of the action of opsonins, agglutinins and anti-toxins The differences between active and passive immunity, and between natural and artificial immunity Autoimmune diseases The principles of vaccination Module 4.2.1 How biodiversity can be considered at different levels The random and non-random sampling strategies that are carried out to measure the biodiversity of a habitat How to measure species richness and species evenness The use and interpretation of Simpson’s Index of Diversity How genetic biodiversity may be assessed The ecological, economic and aesthetic reasons for maintaining biodiversity In situ and ex situ methods of maintaining biodiversity International and local conservation agreements made to protect species and habitats 4.2.2 The biological classification of species The binomial system of naming species and the advantage of such a system The features used to classify organisms into the five kingdoms The evidence that has led to new classification systems The different types of variation Using the standard deviation to measure the spread of a set of data Using the Student’s t-test to compare means of data values of two populations Using the Spearman’s rank correlation coefficient to consider the relationship of the data The different types of adaptations to their environment The mechanism by which natural selection can affect the characteristics of a population over time How evolution in some species has an impact on human populations If you would like to get an idea of the quality of the lessons that are included in this bundle, then download the following five OCR A lessons which have been uploaded for free: Immunity & vaccinations Reasons for maintaining biodiversity Taxonomic hierarchy and the binomial naming system Adaptations and natural selection Transmission of animal and plant pathogens

This bundle of 20 fully-resourced lessons have been designed to allow students who are studying the AQA GCSE Combined Science course to assess their understanding of the topics found within the following units of the specification: B1: Cell Biology B2: Organisation B4: Bioenergetics B5: Homeostasis and response B6: Inheritance, variation and evolution B7: Ecology C1: Atomic structure and the periodic table C2: Bonding, structure and properties of matter C3: Quantitative chemistry C4: Chemical changes C5: Energy changes C6: The rate and extent of chemical change C7: Organic chemistry C8: Chemical analysis C9: Chemistry of the atmosphere P1: Energy P2: Electricity P4: Atomic structure P5: Forces P6: Waves These lessons use a range of exam questions, understanding checks, quick tasks and quiz competitions to engage and motivate the students

This bundle of 18 lessons uses a range of exam questions, tasks, activities and quiz competitions to engage students whilst they assess their knowledge of the topics in modules B1-6, C1-6 and P1-6 of the OCR Gateway A GCSE Combined Science specification. All of the lessons are fully resourced to take away that worry about how to get students to effectively revise in the lead up to assessments.

This bundle contains 17 fully-resourced and detailed lessons that have been designed to cover the content of topic 7 of the AQA A-level Biology specification which concerns genetics, populations, evolution and ecosystems. The wide range of activities included in each lesson will engage the students whilst the detailed content is covered and the understanding and previous knowledge checks allow them to assess their progress on the current topic as well as challenging them to make links to other related topics. Most of the tasks are differentiated to allow differing abilities to access the work and be challenged. The following sub-topics are covered in this bundle of lessons: The use of genetic terminology The inheritance of one or two genes in monohybrid and dihybrid crosses Codominant and multiple alleles The inheritance of sex-linked characteristics Autosomal linkage Epistasis as a gene interaction The use of the chi-squared test Species exist as one or more populations The concepts of gene pool and allele frequency Calculating allele frequencies using the Hardy-Weinberg principle Causes of phenotypic variation Stabilising, directional and disruptive selection Genetic drift Allopatric and sympatric speciation Species, populations, communities and ecosystems Factors affecting the populations in ecosystems Estimating the size of a population using randomly placed quadrats, transects and the mark-release-recapture method Primary succession, from colonisation by pioneer species to climax community Conservation of habitats frequently involves the management of succession This is one of the 8 topics which have to be covered over the length of the 2 year course and therefore it is expected that the teaching time for this bundle will be in excess of 2 months If you want to see the quality of the lessons before purchasing then the lessons on codominant and multiple alleles, epistasis and phenotypic variation are free resources to download

Photosynthesis and respiration are two of the most commonly-assessed topics in the terminal A-level exams but are often poorly understood by students. These 16 lessons have been intricately planned to contain a wide range of activities that will engage and motivate the students whilst covering the key detail to try to deepen their understanding and includes exam-style questions so they are prepared for these assessments. The following specification points in modules 5.2.1 and 5.2.2 of the OCR A-level Biology A course are covered by these lessons: The structure of a chloroplast and the sites of the two main stages of photosynthesis The importance of the photosynthetic pigments Using thin-layer chromatography to separate photosynthetic pigments The light-dependent stage of photosynthesis The fixation of carbon dioxide and the light-independent stage of photosynthesis The uses of triose phosphate Factors affecting photosynthesis The need for cellular respiration The structure of the mitochondrion The process and site of glycolysis The link reaction and its site in the cell The process and site of the Krebs cycle The importance of coenzymes in cellular respiration The process and site of oxidative phosphorylation The chemiosmostic theory The process of anaerobic respiration in eukaryotes The relative energy values of carbohydrates, lipids and proteins as respiratory substrates The use of the respiratory quotient Due to the detail of these lessons, it is estimated that it will take in excess of 2 months of A-level lessons to cover this module If you would like to sample the quality of the lessons, download the uses of triose phosphate, link reaction and respiratory substrates lessons as these have been shared for free

The biological molecules topic is incredibly important, not just because it is found at the start of the course, but also because of its detailed content which must be well understood to promote success with the other 9 Edexcel A-level Biology B topics. Many hours of intricate planning has gone into the design of all of the 19 lessons that are included in this bundle to ensure that the content is covered in detail, understanding is constantly checked and misconceptions addressed and that engagement is high. This is achieved through the wide variety of tasks in the PowerPoints and accompanying worksheets which include exam-style questions with clear answers, discussion points, differentiated tasks and quick quiz competitions. The following specification points are covered by the lessons within this bundle: The differences between monosaccharides, disaccharides and polysaccharides The structure of glucose and ribose The formation of disaccharides and polysaccharides from monosaccharides The structure of starch, glycogen and cellulose The synthesis of a triglyceride The differences between saturated and unsaturated lipids The relationship between the structure of lipids and their roles The structure and properties of phospholipids The structure of an amino acid The formation of polypeptides and proteins The role of ionic, hydrogen and disulphide bonding in proteins The levels of protein structure The structure of collagen and haemoglobin The structure of DNA The semi-conservative replication of DNA A gene is a sequence of bases on DNA that codes for an amino acid sequence The structure of mRNA The structure of tRNA The process of transcription The process of translation Base deletions, insertions and substitutions as gene mutations The effect of point mutations on amino acid sequences The structure of enzymes as globular proteins The concept of specificity and the induced-fit hypothesis Enzymes are catalysts that reduce activation energy Understand how temperature affects enzyme activity Enzymes catalyse a wide range of intracellular reactions as well as extracellular ones The role of inorganic ions in plants The importance of water for living organisms Due to the detail included in these lessons, it is estimated that it will take in excess of 2 months of allocated A-level teaching time to complete. If you would like to see the quality of the lessons then download the monosaccharides, disaccharides and polysaccharides, glucose and ribose, triglycerides, structure of DNA and transcription lessons as these have been uploaded for free.