Pre-med/IB-style questions covering carbohydrate structure (mono/di/polysaccharides), glycosidic bonds, reducing sugars, alpha vs beta linkages, storage vs structural polysaccharides (starch, glycogen, cellulose, chitin), and cell biology roles (glycocalyx, glycoproteins/glycolipids, cell recognition, peptidoglycan).
Why are large polysaccharides (e.g., glycogen, starch) better for intracellular glucose storage than storing the same number of glucose molecules as free monosaccharides?
Source: entermedschool.org
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src="https://entermedschool.org/embed/questions#{"title":"Carbohydrates: Sugars as Macromolecules","questions":[{"prompt":"Why are large polysaccharides (e.g., glycogen, starch) better for intracellular glucose storage than storing the same number of glucose molecules as free monosaccharides?","options":[{"label":"A","body":"Polysaccharides diffuse across membranes more easily than monosaccharides","isCorrect":false},{"label":"B","body":"Polysaccharides create a much lower osmotic effect per glucose unit and can be stored compactly","isCorrect":true},{"label":"C","body":"Polysaccharides are more reactive and therefore easier to mobilize instantly","isCorrect":false},{"label":"D","body":"Polysaccharides are amphipathic and form bilayers around glucose","isCorrect":false},{"label":"E","body":"Polysaccharides cannot be broken down back into glucose","isCorrect":false}],"explanation":"Many separate glucose molecules would strongly raise osmotic pressure (drawing in water). Linking glucose into a polymer drastically reduces the number of particles in solution, lowering osmotic stress, while still allowing rapid hydrolysis when needed. Polysaccharides do not diffuse across membranes as such, and they can be broken down enzymatically."},{"prompt":"The formation of a glycosidic bond between two monosaccharides is best described as:","options":[{"label":"A","body":"A hydrolysis reaction that consumes water","isCorrect":false},{"label":"B","body":"A condensation (dehydration) reaction that releases water","isCorrect":true},{"label":"C","body":"A redox reaction that transfers electrons","isCorrect":false},{"label":"D","body":"A phosphorylation reaction that adds phosphate","isCorrect":false},{"label":"E","body":"A reaction that forms peptide bonds","isCorrect":false}],"explanation":"Glycosidic bonds form when two sugars join and water is released (condensation). Hydrolysis is the reverse reaction (uses water to break the bond)."},{"prompt":"Which description best defines a glycosidic bond in carbohydrates?","options":[{"label":"A","body":"A covalent bond between two amino acids","isCorrect":false},{"label":"B","body":"A covalent bond between sugar units, typically involving the anomeric carbon of one sugar","isCorrect":true},{"label":"C","body":"A hydrogen bond between parallel β-sheets","isCorrect":false},{"label":"D","body":"An ionic bond between fatty acid heads and tails","isCorrect":false},{"label":"E","body":"A phosphodiester bond linking nucleotides","isCorrect":false}],"explanation":"A glycosidic bond is the covalent linkage between sugars (e.g., in disaccharides and polysaccharides), often formed from the anomeric carbon of one monosaccharide to a hydroxyl of another. Peptide and phosphodiester bonds belong to proteins and nucleic acids, respectively."},{"prompt":"Which disaccharide is NON-reducing (i.e., cannot act as a reducing sugar)?","options":[{"label":"A","body":"Maltose","isCorrect":false},{"label":"B","body":"Lactose","isCorrect":false},{"label":"C","body":"Sucrose","isCorrect":true},{"label":"D","body":"Cellobiose","isCorrect":false},{"label":"E","body":"All disaccharides are reducing","isCorrect":false}],"explanation":"Sucrose is non-reducing because its glycosidic bond involves both anomeric carbons, leaving no free anomeric carbon to open into a reactive carbonyl form. Maltose, lactose, and cellobiose each retain a free anomeric carbon and are reducing sugars."},{"prompt":"A carbohydrate is called a “reducing sugar” mainly because it:","options":[{"label":"A","body":"Has at least one free anomeric carbon that can open to a reactive aldehyde/ketone form","isCorrect":true},{"label":"B","body":"Always contains a phosphate group","isCorrect":false},{"label":"C","body":"Is always a polysaccharide","isCorrect":false},{"label":"D","body":"Is always insoluble in water","isCorrect":false},{"label":"E","body":"Can only be digested by bacteria","isCorrect":false}],"explanation":"Reducing sugars can donate electrons in oxidation reactions because they can form a free carbonyl (via ring opening) at an anomeric carbon. Phosphate groups and solubility are not the defining features, and reducing sugars can be mono- or disaccharides (and some polysaccharides have a reducing end)."},{"prompt":"Which disaccharide is composed of glucose + galactose and is typically a reducing sugar?","options":[{"label":"A","body":"Sucrose","isCorrect":false},{"label":"B","body":"Maltose","isCorrect":false},{"label":"C","body":"Lactose","isCorrect":true},{"label":"D","body":"Trehalose","isCorrect":false},{"label":"E","body":"Cellulose","isCorrect":false}],"explanation":"Lactose is glucose + galactose and has a free anomeric carbon, making it reducing. Maltose is glucose + glucose. Sucrose is glucose + fructose and is non-reducing. Cellulose is a polysaccharide, not a disaccharide."},{"prompt":"The “anomeric carbon” of a monosaccharide is best described as the carbon that:","options":[{"label":"A","body":"Always carries the phosphate group in the cell","isCorrect":false},{"label":"B","body":"Was the carbonyl carbon (aldehyde/ketone) in the linear form and becomes a new stereocenter in the ring form","isCorrect":true},{"label":"C","body":"Is always the terminal carbon farthest from oxygen","isCorrect":false},{"label":"D","body":"Forms peptide bonds with amino acids","isCorrect":false},{"label":"E","body":"Is the only carbon present in carbohydrates","isCorrect":false}],"explanation":"When a sugar cyclizes, the carbonyl carbon becomes the anomeric carbon. Its configuration (α or β) is crucial because it determines the type of glycosidic bonds and polymer structure."},{"prompt":"When a glycosidic bond forms using a sugar’s anomeric carbon, what happens to that anomeric carbon?","options":[{"label":"A","body":"It becomes unable to participate in ring opening (it is “locked” as an acetal/ketal)","isCorrect":true},{"label":"B","body":"It becomes a phosphate group","isCorrect":false},{"label":"C","body":"It becomes an amino acid","isCorrect":false},{"label":"D","body":"It is removed from the molecule","isCorrect":false},{"label":"E","body":"It turns into a peptide bond","isCorrect":false}],"explanation":"A glycosidic bond converts the anomeric carbon from a hemiacetal/hemiketal to an acetal/ketal, preventing ring opening at that carbon. This is why linking both anomeric carbons (as in sucrose) removes reducing ability."},{"prompt":"Cellulose differs from starch mainly because cellulose contains:","options":[{"label":"A","body":"α(1→4) glycosidic bonds that form a helix","isCorrect":false},{"label":"B","body":"β(1→4) glycosidic bonds that create straight chains","isCorrect":true},{"label":"C","body":"Peptide bonds between glucose units","isCorrect":false},{"label":"D","body":"Phosphodiester bonds between glucose units","isCorrect":false},{"label":"E","body":"Only fructose units","isCorrect":false}],"explanation":"Cellulose is a glucose polymer with β(1→4) links, producing straight chains that hydrogen-bond into strong fibers. Starch mainly has α linkages (α1→4 and α1→6), giving different shapes and digestibility."},{"prompt":"Humans cannot digest cellulose efficiently because humans lack:","options":[{"label":"A","body":"Enzymes that break α(1→4) glycosidic bonds","isCorrect":false},{"label":"B","body":"Enzymes that break β(1→4) glycosidic bonds between glucose units (cellulase)","isCorrect":true},{"label":"C","body":"The ability to absorb glucose from the intestine","isCorrect":false},{"label":"D","body":"Hydrochloric acid in the stomach","isCorrect":false},{"label":"E","body":"Any enzymes that digest carbohydrates at all","isCorrect":false}],"explanation":"Human enzymes (like amylase) digest α linkages in starch, but humans lack cellulase to hydrolyze β(1→4) bonds in cellulose. Therefore cellulose behaves as dietary fiber for humans."},{"prompt":"Which statement best explains why cellulose fibers are mechanically strong?","options":[{"label":"A","body":"Cellulose chains are highly branched, trapping large amounts of water","isCorrect":false},{"label":"B","body":"Straight cellulose chains align and form extensive hydrogen bonds between chains","isCorrect":true},{"label":"C","body":"Cellulose contains many disulfide bonds between chains","isCorrect":false},{"label":"D","body":"Cellulose is made of lipid bilayers stacked together","isCorrect":false},{"label":"E","body":"Cellulose is a protein with α-helices","isCorrect":false}],"explanation":"β(1→4) linkages yield straight chains that pack tightly and hydrogen-bond with neighboring chains, forming strong microfibrils. It is not branched, and it contains no disulfide bonds because it is not a protein."},{"prompt":"Which polysaccharide is the primary glucose storage polymer in animals?","options":[{"label":"A","body":"Cellulose","isCorrect":false},{"label":"B","body":"Chitin","isCorrect":false},{"label":"C","body":"Glycogen","isCorrect":true},{"label":"D","body":"Amylose","isCorrect":false},{"label":"E","body":"Pectin","isCorrect":false}],"explanation":"Animals store glucose mainly as glycogen, a highly branched polymer. Plants store glucose largely as starch (amylose/amylopectin). Cellulose and chitin are structural."},{"prompt":"Compared with amylopectin (starch), glycogen typically has:","options":[{"label":"A","body":"Fewer branches (fewer α(1→6) linkages)","isCorrect":false},{"label":"B","body":"More frequent branching (more α(1→6) linkages)","isCorrect":true},{"label":"C","body":"β(1→4) linkages instead of α linkages","isCorrect":false},{"label":"D","body":"No glucose units","isCorrect":false},{"label":"E","body":"Only fructose units","isCorrect":false}],"explanation":"Both glycogen and amylopectin contain α(1→4) chains with α(1→6) branch points, but glycogen is usually more highly branched. This increases the number of chain ends and supports faster mobilization of glucose."},{"prompt":"A key advantage of glycogen’s branching for rapid energy release is that branching:","options":[{"label":"A","body":"Eliminates the need for enzymes","isCorrect":false},{"label":"B","body":"Creates many non-reducing ends where enzymes can add/remove glucose quickly","isCorrect":true},{"label":"C","body":"Makes glycogen able to cross membranes directly","isCorrect":false},{"label":"D","body":"Creates β(1→4) bonds that are harder to break","isCorrect":false},{"label":"E","body":"Turns glycogen into a lipid","isCorrect":false}],"explanation":"Enzymes that build and break glycogen act at chain ends. More branching means more ends (especially non-reducing ends), increasing the rate at which glucose units can be released or added."},{"prompt":"Which statement correctly matches amylose and amylopectin?","options":[{"label":"A","body":"Amylose is highly branched; amylopectin is unbranched","isCorrect":false},{"label":"B","body":"Amylose is mostly unbranched (α1→4); amylopectin is branched (α1→4 with α1→6)","isCorrect":true},{"label":"C","body":"Amylose contains β(1→4) bonds; amylopectin contains peptide bonds","isCorrect":false},{"label":"D","body":"Amylose is made of fructose; amylopectin is made of galactose","isCorrect":false},{"label":"E","body":"Both are structural components of insect exoskeleton","isCorrect":false}],"explanation":"Amylose is largely linear (α1→4 glucose polymer) and can form helical structures; amylopectin has α1→6 branches. Chitin (not starch) is a major exoskeleton component."},{"prompt":"Which pair of monosaccharides are epimers (differ at exactly one chiral carbon)?","options":[{"label":"A","body":"Glucose and fructose","isCorrect":false},{"label":"B","body":"Glucose and galactose","isCorrect":true},{"label":"C","body":"Glucose and sucrose","isCorrect":false},{"label":"D","body":"Starch and cellulose","isCorrect":false},{"label":"E","body":"Glycine and alanine","isCorrect":false}],"explanation":"Glucose and galactose are epimers (commonly at C-4). Glucose and fructose are structural isomers (aldose vs ketose), not epimers. The other pairs are not monosaccharide stereoisomers."},{"prompt":"Which monosaccharide is a ketose (rather than an aldose)?","options":[{"label":"A","body":"Glucose","isCorrect":false},{"label":"B","body":"Galactose","isCorrect":false},{"label":"C","body":"Fructose","isCorrect":true},{"label":"D","body":"Ribose","isCorrect":false},{"label":"E","body":"Deoxyribose","isCorrect":false}],"explanation":"Fructose is a ketose (carbonyl as a ketone in the linear form). Glucose and galactose are aldoses, and ribose/deoxyribose are aldopentoses."},{"prompt":"Most biologically common sugars are in the D-configuration. This statement refers primarily to:","options":[{"label":"A","body":"Whether the sugar can be digested by humans","isCorrect":false},{"label":"B","body":"Whether the sugar is a reducing sugar","isCorrect":false},{"label":"C","body":"The stereochemistry around the chiral carbon farthest from the carbonyl group (relative to D-glyceraldehyde)","isCorrect":true},{"label":"D","body":"Whether the sugar forms α or β anomers","isCorrect":false},{"label":"E","body":"The number of carbons in the sugar","isCorrect":false}],"explanation":"D/L describes stereochemistry relative to glyceraldehyde and is determined by the configuration at the highest-numbered chiral center (farthest from the carbonyl). It is not a statement about reducing ability, digestibility, or α/β anomers."},{"prompt":"Chitin is best described as:","options":[{"label":"A","body":"A branched α(1→6) glucose polymer used for animal energy storage","isCorrect":false},{"label":"B","body":"A β(1→4) polymer of N-acetylglucosamine found in arthropod exoskeletons and fungal cell walls","isCorrect":true},{"label":"C","body":"A disaccharide of glucose + fructose","isCorrect":false},{"label":"D","body":"A lipid used to form membranes","isCorrect":false},{"label":"E","body":"A nucleic acid sugar found only in DNA","isCorrect":false}],"explanation":"Chitin is a structural polysaccharide similar to cellulose in having β(1→4) linkages, but its monomer is N-acetylglucosamine. It is not a storage polymer like glycogen."},{"prompt":"In animal cells, carbohydrates on the external surface of the plasma membrane are most commonly found as part of:","options":[{"label":"A","body":"Free polysaccharides floating in the cytosol","isCorrect":false},{"label":"B","body":"Glycoproteins and glycolipids forming the glycocalyx","isCorrect":true},{"label":"C","body":"DNA and RNA projecting through the membrane","isCorrect":false},{"label":"D","body":"Triglycerides embedded as the main bilayer component","isCorrect":false},{"label":"E","body":"Cellulose microfibrils anchored in the membrane","isCorrect":false}],"explanation":"Membrane carbohydrates are typically attached to proteins (glycoproteins) or lipids (glycolipids) and face the extracellular space, forming the glycocalyx. They are not free-floating polymers in the cytosol."}]}"
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