Most popular

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

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

Membrane transport modelsfree18 November 2017

Using all that we know about molecules and about the structure of the cell membranes students are challenged to illustrate the transport of four very different molecules through the membrane using play-doh,... more

Properties of Water22 September 2019

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

Falsification of membrane structuresfree18 November 2017

The accepted model of membrane structure today is the fluid-mosaic model but this has not always been so. Since 1900 there have been a series of hypothetical structures proposed and tested. The evidence... more

Intestine Structure & Function.27 June 2019

After learning how 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... more

Further Membrane Structurefree27 August 2017

In this activity students see for themselves the wonderful interactions which occur inside cells and between cells using a short animation from Harvard university. The roles of some membrane proteins... more

Endosymbiosis - Nature of Sciencefree18 November 2017

The idea that mitochondria once existed as free living bacteria and that a simple cell engulfed one of these bacterial cells and promptly became a eukaryote cell is a difficult idea to ‘prove’. The... 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

Structure of the digestive system.3 May 2019

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

Calorimetry experiment.7 October 2019

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

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

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

Alveoli & gas exchange22 May 2019

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

Classification of Plants22 July 2019

Starting with some self study activities students begin to learn the names and features of the four plant phyla required for IB. Then, using a dichotomous key students search for examples of each phyla... 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

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

Topic 1 - Cells revision activitiesfree22 May 2019

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

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

Ecological terms.24 September 2019

"Ecology is the study of the distribution and abundance of organisms, the interaction between organisms, the interaction between organisms and their environment, and structure and function of ecosystems."... 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

Activation energy and enzyme pathways8 September 2019

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

Variation & overproduction17 May 2019

To understand how natural selection leads to evolution it is important to know about variation and overproduction of offspring. These two concepts are the key to understanding evolution. In this activity... more

Synapses25 September 2019

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

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

Cell Respiration.9 October 2019

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

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

IA - Avoiding common errors23 July 2019

Students are still learning how to complete an IA as they embark on this important piece of work. They gain so many new skills during the process that if it were possible to start again, once they have... 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

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

Classification & binomial names20 July 2015

Students will learn how to classify organisms according to their taxonomic group, and how to understand the binomial nomenclature. These are a few introductory slides and then a card sorting activity... more

Evolution examples8 October 2017

Students investigate adaptive radiation and industrial melanism as well as gradual divergence of populations into separate species. All of these ideas have been contested by some groups so IB students... 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

Transcription - extras for HL8 January 2019

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

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

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

Seeds, flowering & phytochromes1 February 2016

How can a pigment change the behaviour of the cellsHint: Click to display some suggestionsThe pigment must be changed by the light.There might be an active form of the pigment. more

Hormonal control in plants14 February 2019

How do plants respond to light if they don't have eyes nor a brain? The mechanism is quite complex but it is a good illustration of the role of membrane proteins and the fluid nature of the plasma membrane.... more

Immune System free23 October 2019

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

Ecology mini-investigation11 October 2018

What does an Individual investigation look like? Students will try out all the steps of the planning and carrying out of the individual investigation in the collaborative safety of group work. For each... more

Climate Change.free9 October 2018

Two short videos introduce this lesson. David Suzuki gives a simple outline of the process of climate change due to an enhanced greenhouse effect and the second illustrates the complexity of the models... 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

Describing communities6 March 2018

A theoretical lesson to look at the role of organisms in food webs. Beginning with a short explanation of the roles and limiting factors this activity quickly moves to a model community and a challenge... more

DNA Replicationfree17 March 2019

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

DNA structure - Extras for HL9 January 2019

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

Gene pools26 May 2017

After consideration of what a gene pool is and the way that evolution causes changes in gene pools this lesson looks at the driving forces of speciation using the examples of Bird of paradise species... 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

Lactose Intolerance23 July 2019

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

Transcription of mRNA from DNA18 January 2019

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

Experiments on Transpiration.11 August 2017

What makes a good experiment?How can you estimate the uncertainty of any apparatus?What would the units be of the "Rate of transpiration"Carry out the activities on the Simple transpiration experiments... more