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.

Explore optical activity and optical isomers, including racemic mixtures, resolution, and Pasteur's work, with examples like glyceraldehyde and dihydroxyacetone and the role of chiral centers.

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.

Explore formation of hemiacetals and hemiketals in carbohydrates, leading to alpha and beta anomers of d-glucose as intramolecular rings, with anomeric carbon and interconversion.

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.

Explore epimers and sugars by configuration, covering trioses, tetroses, and pentoses, including glucose, galactose, mannose, ribose and deoxyribose, and their roles in glycolysis, nucleic acids, glycogen, and diabetes.

Explore the differences between galactose and fructose, their sources in milk, fruit, honey, and sucrose, and hereditary diseases like galactosemia and hereditary fructose intolerance.

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.

Explain how monosaccharides are oxidized to carboxyl groups, classifying reducing sugars, and describe Benedict's test where sugars reduce cupric to cuprous oxide, detecting glucose in blood and 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.

Explore disaccharides, formed from two monosaccharides via glycosidic bonds, including maltose and lactose, with reducing and non-reducing ends and concepts like mutarotation and anomeric carbon.

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.

Explain sucrose as a disaccharide of glucose and fructose with an alpha glycosidic linkage and no reducing group, a non-reducing sugar; hydrolysis yields glucose and fructose (invert sugar).

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.