An Investigation Into the Inhibiting Effect of Tomato Juice on the Germination of Cress Seeds

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An Investigation Into the Inhibiting Effect of Tomato Juice on the Germination of Cress Seeds Introduction ============ I intend to analyse the inhibiting effect of tomato juice on the germination of tomato juice. In this introduction I will answer important questions such as; what are inhibitors? How might inhibitors affect germination? , etc. When answering the questions, I will be considering different areas of the syllabus (e.g. genetics, inter-specific competition, enzymes and inhibitors, practical skills, etc.) This will help me appreciate the theory behind the investigation and hence help me formulate an effective plan and method. Inhibitors are chemicals, which inhibit the…show more content…
Diagram to show competitive inhibition: Normal substrate molecule substrate molecule can no longer Fitting into active site due to presence of inhibitor molecule Non-competitive inhibitors do not compete for a place on the active site, they attach themselves to the enzyme, and the shape of the active site is altered so that the substrate molecule can no longer fit. If the inhibitors of the tomato juice are to inhibit germination there are various factors they can affect. For instance, the inhibitors can affect the enzyme amylase. Amylase is used to convert starch into glucose. The glucose is then used as a respiratory substrate to produce ATP. Without respiration the seed cannot germinate (because energy/ATP is needed for metabolisms for growth). So by inhibiting the enzyme amylase the inhibitors will prevent germination. The presence of inhibitors in tomatoes can provide benefits for the tomatoes. By inhibiting the growth of other seeds they are in effect reducing inter-specific competition for essential nutrients and therefore are more likely to flourish. They will be able to gain the light, carbon dioxide, heat, etc, first and hence grow taller and maybe even block off light to the plants below them. They will be able to photosynthesise more,

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