GCSE Biology - Rate of Reaction

In this episode, we will discuss the alveoli in the circulatory system.Alveoli are microscopic air sacs within the lungs where the crucial exchange of oxygen and carbon dioxide occurs between air and blood through diffusion. Their structure is highly adapted for this vital proces ...  Show more

In this episode, we look at transportation in cells. We will explain how substances move into and out of cells, highlighting three key mechanisms. Diffusion is described as the movement of particles from high to low concentration areas. Osmosis is presented as a specific type of ...  Show more

Richard looks at chemical reactions & equations for your GCSE Chemistry exam. In this episode,  he will look at what chemical reactions are and the different types of equations. Suitable for AQA, OCR, Edexcel, CIE and WJEC exam boards. Ideal for preparing your ...

This episode reviews the topic investigating biological molecules, including: How to test for the presence of reducing sugars, non-reducing sugars, starch, proteins and lipids. This episode is suitable for all examination boards but more specifically geared to AQA A-Level Biology ...  Show more

Biology/Biochemistry: In this first episode of biology and biochemistry, we go over topics such as the menstrual cycle, the cell cycle, the male and female reproductive system, and more. 

This week, Emma's got the lowdown on facilitated diffusion and polarized membranes for your AP Bio exam. She looks at how molecules diffuse through carrier proteins or channel proteins in membranes. Perfect for AQA, Edexcel and OCR exam boards. Ideal for preparing you for your A ...  Show more