Carbohydrates / Biomolecules / biochemistry

Define carbohydrates and classify them into monosaccharides, disaccharides, oligosaccharides, and polysaccharides, with aldose and ketose types, glycosidic bonds, and examples like glucose, fructose, ribose, and lactose.

Explore isomerism in biomolecules, defining isomers as same‑formula but different structures, and classify them into constitutional and stereoisomers—enantiomers, diastereomers, and geometric isomers.

Explore isomerism by distinguishing chiral centers and non rotating double bonds. Compare cis-trans geometric isomers using malic and fumaric acids as examples.

Learn about D and L isomerism in carbohydrates, focusing on glyceraldehyde and glucose. Identify how the right or left side hydroxyl orientation on key carbons designates D or L forms.

Explore how chiral centers create D and L forms, with dextrorotatory and levorotatory isomers that share chemical properties but differ in optical activity and physical and biological properties.

Explore enantiomers and optical activity in carbohydrates, focusing on asymmetric (chiral) carbons, dextrorotatory and levorotatory forms, and how plane-polarized light distinguishes D and L isomers.

Explain how aldo tetroses form cyclic structures by reacting aldehyde and hydroxyl groups in five or more carbon monosaccharides, releasing water to form hemiacetal or hemiketal forms and alpha/beta anomers.

Describe the ring formation of carbohydrates in glucose via intramolecular hemiacetal between carbon 1 and carbon 5. Define the anomeric carbon and the alpha and beta glucopyranose isomers.

Explore the ring structures of monosaccharides, including aldohexose pyranose and ketohexose furanose, and mutarotation that interconverts alpha and beta glucose.

Describe oxidation properties of monosaccharides, from aldehyde oxidation at carbon 1 to carboxylate formation. Explain uronic acids formed by oxidation at carbon 6 and glucono delta lactone.

Describe the properties of monosaccharides, including gluconic acid formation and energy yield. Explain how D-glucuronic acid forms in the liver and detoxifies via glucuronide excretion in urine.

Describe the properties of monosaccharides, focusing on phosphorylation of glucose to beta-D-glucose-6-phosphate and its role in glycolysis and ATP synthesis via phosphorylated intermediates.

Learn how amino sugars form when the hydroxyl at carbon 2 of a monosaccharide is replaced by an amino group, yielding beta-d-glucosaminyl and acetyl glucosamine.

Explain how deoxy sugars such as 2-deoxy-D-ribose form by hydroxyl removal, and how glycosides arise from monosaccharide condensation to form glycosidic bonds and acetals.

Monosaccharides like d-glucose reduce to sugar alcohols sorbitol and mannitol; fructose forms a similar product, and ribose produced too. Sorbitol adds sweetness and mannitol acts as an osmotic diuretic.

tautomerization shifts a hydrogen from one carbon to another under alkaline conditions, converting glucose into d-fructose and d-mannose via enediol intermediates and forming a common any diol intermediate.

Convert lactose into glucose and galactose in the small intestine with lactase. Ferment lactose by gut bacteria without lactase, causing flatulence, abdominal pain, bloating, cramps, and diarrhea.

Describe oligosaccharides formed from 3–10 monosaccharides by glycosidic bonds; explore their role in membrane glycoproteins, cell recognition, and ABO blood group antigens.

Explore the diversity of polysaccharides and glycans, including homo and hetero polysaccharides, storage starch and glycogen, plant cellulose, and the amylose–amylopectin starch types.