2.10.3 Response to Stimuli: Plants. 3. Plant hormones - AQA; Sign in, choose your GCSE subjects and see content that's tailored for you. The digestion of proteins from the diet results in excess amino acids which need to be excreted safely, as they cannot be stored by the body in the same way that excess glucose can; Deamination is the process of breaking down excess protein and it predominantly occurs in the liver; Enzymes in the liver split up amino acid molecules, with the part containing carbon turned First created in 2000 and updated in 2013, 2015 & 2020 5.1 The Human Nervous System. Exam board content from BBC Bitesize for students in England and Northern Ireland. Prepare for your transition to sixth form with our Bridging the Gap courses.Learn skills and knowledge you will need for your A-levels in our 2-day online courses for Maths (27-28th August), Biology (27-28th August), Chemistry (29-20th August) and Physics (29-20th August).Suitable for all exam boards. 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