This resource contains a five PowerPoints with animations and videos along with student question sheets to accompany each PowerPoint. These help students to explain: The role of enzymes in catalysing reactions that affect metabolism at a cellular and whole organism level. The role of enzymes in catalysing both intracellular and extracellular reactions The mechanism of enzyme action. The effects of pH, temperature, enzyme concentration and substrate concentration on enzyme activity. Practical investigation into the effects of substrate concentration on enzyme activity (OCR PAG 4.1). The need for coenzymes, cofactors and prosthetic groups in some enzyme-controlled reactions. The effects of inhibitors on the rate of enzyme- controlled reactions. Everything you’ll need to teach a series of lessons (approximately 4 x 1 hour lessons) on enzymes; plus a practical which takes approximately 2 hours. Each PowerPoint contains the answers to the student question sheets. There is also an end of topic test with mark scheme and an enzymes crossword to help embed key words.