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Properties of Water.2 October 2018

This lesson uses a screen cast to introduce a simple diagram of hydrogen bonding in water. There are a range of activities to help student to understand how these hydrogen bonds affect the properties... more

Drawing biological molecules24 September 2018

Students learn how to draw the following molecules; glucose, ribose, saturated fatty acid and an amino acid. They answers questions which gives practice in recognition of each molecule activity. This... more

Yeast and Catalase Experiment17 November 2016

Following a teacher demonstration of measuring the rate of hydrogen peroxide and catalase enzyme students carry out a circus of three simple enzyme experiments.These experiments illustrate the effects... more

Activation energy and enzyme pathways14 September 2016

Students are introduced to a simple metabolic pathway consisting of a chain of enzyme-catalysed reactions leading to the Kreb's cycle which is a cycle of enzyme catalysed reactions. The method of enzymes... more

Condensation & Hydrolysis.9 October 2018

A set of slides helps a teacher led description of how two glucose molecules form a dissacharide by condensation and the same for two amino acids and three fatty acids with glycerol, as in a triglyceride.Students... more

Protein Structure.19 October 2018

Knowing the four levels of proteins structure is essential if we are to understand how proteins function in the body. In the first activity students model the different components of protein structure... more

DNA Replicationfree1 June 2017

The central dogma of molecular biology, described by Francis Crick, begins with DNA replication. It really is the essence of inheritance and perhaps even the essence of life itself. At SL there are just... more

Calorimetry experiment.9 October 2018

A great simple experiment to illustrate the energy content of these two organic molecules used for energy storage. Students carry out a calorific test on lipids and carbohydrates. They use visualisations... more

Cell Respiration.24 August 2016

With the smell of caramel from the burning glucose filling the lab, students discuss the need for metabolic pathways in respiration. A card sort activity and discussion will outline the main ideas for... more

Lactose Intolerance3 December 2017

What is lactose intolerance and how can biology help those who are lactose intolerant? Students investigate the commercial uses of enzymes and in particular how the use of lactase in food production... more

Theoretical Genetics 2.9 February 2018

Beginning with a review of the punnet square questions from last lesson, students are then introduced to some more complex genetics using the example of human blood groups. Teacher led Description of... more

Blood clotting and heart disease.1 July 2018

Students sequence and explain the events of the chemical cascade which leads to the formation of a blood clot or scab using SOLO hexagons. This is followed by a short activity outlining an important application... more

Nerve impulses.28 September 2018

Name three different roles of integral proteins in cell membranes.How can integral proteins in a neurone plasma membrane cause an electrical potential across the membrane?What do these proteins do to... more

Intestine Structure & Function.30 May 2017

After learning to draw an annotated diagram of the digestive system students extend their understanding by looking at details of intestine structure and how they relate to function. This includes identification... more

Mitotic index & cancerfree14 January 2015

This is a great online activity. Students are first guided through the identification of cells in different stages of mitosis using an online simulation. Once they are confidence students count and record... more

End product inhibition of Enzymes.29 April 2017

Following a quick review of enzyme inhibition students complete a few structured notes leading to an experiment with enzymes and inhibitors. Students collect data and produce graphs for analysis. A third... more

Alveoli & gas exchange9 November 2017

Students learn about the structure of the lungs and their alveoli including type I and II pneumocytes. After a short quiz on basic lung structure a short screen cast helps students to complete a diagram... more

Transcription - extras for HL24 January 2017

This lesson begins with a review of the process of transcription and the role of RNA polymerase but quickly turns to the control of gene expression using nucleosomes and methylation. Experiments with... more

IB style topic testsfree27 December 2014

These test are designed to help teachers assess students at the end of each topic and to help students practise IB style questions. They have been written specially for Inthinking Biology by experienced... more

Chromosomesfree21 January 2018

This lesson begins with a comparison of prokaryote and eukaryote chromosomes and an introduction to the concept of diploid and haploid nuclei. The second activity introduces the use of databases to compare... more

Antigens and antibodies 19 February 2015

How can the proteins on the surface of cells, called antigens, help the body's immune system to identify pathogens?Use the following slides to introduce antigens and antibodies Antigens & antibodies more

DNA structure - Extras for HL24 October 2018

This lesson introduces students to nucleosomes, and some of the details of DNA structure which will help to understand DNA replication. This includes the purine and pyrimidines bases as well as 5' and... more

Transcription of mRNA from DNA16 January 2017

Using an animated visualisation of RNA polymerase students will learn how to describe the process of translation in simple terms. In order to do this a good knowledge of the structure of RNA is important.... more

Structure of the digestive system.16 November 2016

With a short screencast students learn a simple method of drawing a diagram of the digestive system. Annotations are added and students can practice their knowledge using some printable flashcards or... more

Theoretical Genetics 1.2 February 2018

In this lesson students will be shown the link between chromosomes and genetics. A powerpoint intro to allele and genotypes in a simple case of inheritance of flower colour illustrates the link and demonstrates... more

DNA Replication for HL Students17 June 2016

In this lesson students explore the extra details require in the explanation of DNA replication for HL students. This includes the functions of four extra enzymes and the concepts of leading and lagging... more

Vaccination18 November 2018

Measles is a highly contagious disease and one of the leading causes of death of children under 5. In 2013 it is estimated that almost 150 thousand children died from measles worldwide. The World Health... more

Antibody production7 June 2018

Two important ideas about antibodies are addressed in this lesson plan. Students first discuss ideas about immunity and mark a piece of student work using a mark scheme to consolidates their understanding... more

Ventilation & lung disease22 July 2015

Students begin by looking at the muscle contractions which cause the pressure changes inside the thorax that force air in and out of the lungs to ventilate them. This is followed by an experiment to monitor... more

Control of cell cycle & cancerfree29 September 2015

The control of the cell cycle is essential for the normal functioning of the body. Cyclins have a key role in this control. Oncogenes have the opposite effect and effectively remove the control of the... more

Osmoregulation.21 October 2015

Students learn about three methods of controlling water balance in this lesson. A short presentation reminds students about osmosis and introduces some examples osmoconformers and osmoregulators from... more

Immune System 22 December 2014

This lesson contains two constructivist activities. In the first students research and classify microorganisms into pathogens and non pathogens. The second activity is a challenge to narrate a series... more

Kidney and nephrons.21 May 2017

What happens inside the kidney?How can the kidney filter some molecules, like urea, out of the blood?Draw a diagram of the kidney using this screen cast as a guide. Remember to keep the lines nice and... more

Membrane Structurefree21 May 2017

Students watch a video diagram and have a chance to practise drawing a diagram of plasma membrane structure. Using a range of resources including; a screen cast, flashcards of the labels and their annotations,... more

Photosynthesis Theory23 February 2016

Standard level students need to know about photolysis and the light independent reactions which take place in the stroma but with only simple details. This activity leaves out the complexity and gives... more

Controlling Heartbeatfree21 January 2016

This simple classroom activity is worksheet based with an interactive whiteboard presentation. It will help students to make sense of the links between the medulla oblongata, the adrenal glands and the... more

Photosynthetic pigments 27 January 2017

Students investigate a simple practical method of separating photosynthetic pigments (practical 4)using paper chromatography (or thin layer chromatography). Following this there is an animation of chromatography... more

Topic 1 - Cells revision activitiesfree29 November 2016

All the different aspects of the cells topic on a single A3 sheet, for revision. By completing short questions or explanations students are forced to review the whole topic and complete an overview of... more

Heart Dissection & Diagram2 December 2017

Using a short screen cast students learn a simple method of drawing a diagram of the heart. Annotations are added and students can practice their knowledge using some printable flashcards or a range of... more

Respiration experiments.19 September 2015

Two nice experiments, the first looks a respiration rates in fly larvae and the second links the structures of different carbohydrates to the rate of respiration in yeast. This is an opportunity to discuss... more

Photosynthesis Experimentsfree31 January 2017

This activity introduces a simple method of measuring the rate of photosynthesis and leads students to design their own investigation of a factor which affects it. A second activity illustrates how the... more

Intro to cladistics18 December 2016

What is a clade? How can we explain analogous and homologous traits using cladograms? What do we need to know about cladograms? All these important questions are covered in this lesson plan using a... more

Muscle structure & function.6 October 2016

Students use a short powerpoint introduction to identify key points of muscle structure and the interaction between myosin and actin filaments in sarcomeres before answering some questions on a worksheet.... more

Synapses.free7 December 2018

This activity involves lots of discussion and a little competition to help students learn the details of synaptic transmission. First by annotation of simple diagrams showing the structures of a synapse... more

Meristems and Growth.29 January 2018

What is a meristem and how is it that a plant can keep growing for the whole of its life? Micropropagation using the plant meristems as a source of undifferentiated cells has become an important method... more

Sex Linked Genes.4 March 2018

In this lesson plan students read about the inheritance of colour blindness and hemophilia as examples of sex linkage. Then they make structured notes on the essential points using the structured notes... more

Hormones introduction4 December 2017

Students are introduced to hormones in this lesson using three examples, leptin, thyroxin and melatonin. These examples clearly illustrate the nature of hormones and ideas about homeostasis. After some... more

Light Dependent Reactions28 February 2016

This activity reviews the light dependent reactions of photosynthesis which occurs on the thylakoids of the chloroplast. A first activity introduces the parts of the membrane and the stages of the reactions,... more

Reclassification of figworts using cladisticsfree13 October 2016

In this lesson students first try to make a cladogram using the physical appearance of flowers from the figwort family. This illustrates how classification has been done for many years. In the second... more

Leaf stomata & transpiration7 January 2016

A short video introduction to the roles of cells in a leaf followed by some simple note taking about leaf structure and function. The function of stomata is linked to carbon dioxide absorption and also... more