Monosaccharide Orientation, Storage Polysaccharides, and Lipid Chemistry

A set of vocabulary flashcards reviewing glucose monomer orientation, storage polysaccharides (starch and glycogen), cellulose microstructures, lipids, and ring conformations.

Alcohol Flag

The $CH_2OH$ alcohol group on a glucose monomer, which points in a uniform direction across all subunits along molecular chains in polysaccharides such as starch and glycogen.

$$\alpha\text{-glucose}$$

A glucose monomer in which the hydroxyl group attached to the carbon-1 ($\text{C-1}$) position points downwards relative to the sugar ring.

$$1, 4\text{-}\alpha\text{-glycosidic Linkage}$$

The structural bond connecting $\alpha\text{-glucose}$ subunits in starch and glycogen, which consistently points downwards due to the carbon-1 hydroxyl orientation.

Starch

The primary storage polymer for glucose in plants, which is composed of $\alpha\text{-glucose}$ monomers and exists in both unbranched and branched structural forms.

Glycogen

The primary energy storage polymer for glucose in animals, exclusively made of $\alpha\text{-glucose}$ monomers with all alcohol flags pointing upwards and linkages pointing downwards, and always existing in a branched form.

Amylose

The unbranched, purely linear form of starch that naturally coils into a helical spatial arrangement.

Amylopectin

The branched structural form of starch that contains a linear backbone of $1, 4\text{-}\alpha\text{-glycosidic linkages}$ with branched chains of coils extending off the primary sequence.

$$\beta\text{-glucose}$$

The monosaccharide monomer of cellulose in which each successive monomer along the strand is fully rotated by $180^\circ$ relative to its adjacent monomer.

$$1, 4\text{-}\beta\text{-glycosidic Linkage}$$

The linkage geometry joining $\beta\text{-glucose}$ monomers in cellulose, causing both alcohol flags ($CH_2OH$) and hydroxyl groups ($-OH$) to continuously alternate pointing directions (down, then up) along the strand.

Cellulose Fibrils

Structural bundles or fibers formed when multiple linear strands of cellulose stack together and assemble through an extensive network of inter-chain hydrogen bonds, rendering cellulose highly insoluble in aqueous environments.

Triglycerides

Lipids formed by a glycerol backbone attached to three fatty acid tails.

Phospholipids

Lipid molecules composed of a polar, hydrophilic phosphate head group located at the top and nonpolar fatty acid tails extending below.

Phosphate Group Resonance

The chemical delocalization of the double bond between phosphorus and oxygen within a phospholipid's phosphate group, allowing the double bond to exist across available oxygen atoms.

Chair Conformation

A three-dimensional spatial arrangement characteristic of six-sided hexameric glucose rings that forms a twisted hexagon shape.

Graminin

A carbohydrate molecule utilized for structural analysis by directly evaluating its molecular diagram rather than relying on reference notes.