A six-carbon sugar with an aldehyde group, including common sugars like glucose, galactose, and mannose that are essential to life.
From aldo- (aldehyde group) plus hexose (from Greek hex, meaning 'six,' plus sugar suffix -ose). Coined in 19th-century biochemistry as sugars were being systematically classified.
Glucose is an aldohexose, and it's literally the most important food molecule on Earth—every animal, plant, and fungus depends on this six-carbon sugar with its distinctive aldehyde group to power cellular respiration and build cell structures.
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