This lesson describes how the hydrolysis of ATP supplies energy for biological processes and how the phosphorylation of ADP requires energy. The PowerPoint has been designed to cover point 5.6 of the Pearson Edexcel A-level Biology A specification and also describes how ATP is made in the light-dependent stage of photosynthesis and is needed in the light-independent stage.
The start of the lesson focuses on the structure of this energy currency and challenges the students to use their knowledge of nucleotides and specifically RNA nucleotides to recognise the components of ATP. As a result, they will learn that this molecule consists of adenine, ribose and three phosphate groups. In order to release the stored energy, ATP must be broken down and students will be given time to discuss which reaction will be involved as well as the products of this reaction. Time is taken to describe how the hydrolysis of ATP can be coupled to energy-requiring reactions within cells and the examples of skeletal muscle contraction are used as this is covered in greater detail in topic 7. The final part of the lesson considers how ATP is formed when ADP is phosphorylated and students will learn that this occurs in the mitochondria and chloroplast during aerobic respiration and photosynthesis respectively, so that it ties in with the upcoming lessons in topic 5 and 7.
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