Glucose has two isomers: α-glucose and β-glucose, with distinct structures
Glucose exists in two slightly different forms, called α-glucose and β-glucose. They have the same chemical formula but differ in the position of one hydroxyl group.
Real World
Brewing companies like Guinness rely on yeast enzymes that only recognise α-glucose — if glucose existed in only one form, fermentation-based industries would work very differently.
Exam Focus
When drawing isomers, explicitly label the C-1 hydroxyl position — examiners award marks for this structural detail, not just the ring shape.
Evaluation Scaffold
A four-step framework for high-quality evaluation. Use this for 'assess', 'evaluate', and 'to what extent' questions.
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