Which of the following biomolecules contains a phosphodiester bond?
Nucleic acids
Proteins
Carbohydrates
Lipids
Related Questions
The structural polysaccharide peptidoglycan, a key component of bacterial cell walls, possesses a unique feature that distinguishes it from other polysaccharides. This feature is:
The presence of α(1→6) glycosidic linkages.
The exclusive use of glucose as its monomeric unit.
The presence of short peptide chains cross-linking the polysaccharide chains.
Its ability to form triple helices.
The type of bond involved in the formation of sodium chloride, is
Ester bond
Peptide bond
Ionic bond
Covalent bond
Double sugar is
Monosaccharide
Disaccharide
Polysaccharide
Oligosaccharide
Chitin, a structural polysaccharide found in the exoskeleton of arthropods, differs significantly from cellulose in terms of its monomeric unit. This difference primarily stems from:
The presence of an N-acetyl group at C-2 of the monomer
The type of glycosidic linkage between monomers
The degree of polymerization (chain length)
The three-dimensional arrangement of the polymer chains
Hyaluronic acid, a glycosaminoglycan found in connective tissues, exhibits unique viscoelastic properties. Which combination of structural features contributes most significantly to these properties?
Branched structure with α(1→6) linkages, and high sulfate content.
Repeating disaccharide units containing glucuronic acid and N-acetylglucosamine, along with extensive hydration.
Linear structure with β(1→4) linkages, and hydrophobic interactions.
Presence of fucose residues and formation of triple helices.
Iodine forms a blue color complex with starch but not with cellulose. This difference is primarily due to:
The presence of branching in cellulose.
The higher molecular weight of cellulose.
Difference in glycosidic linkages and resulting structural conformations.
The different monomer composition of cellulose and starch.
Inulin, a storage polysaccharide found in some plants, differs from starch in several key aspects. Which of the following statements accurately describes a major difference between inulin and starch?
Inulin is a branched polymer, while starch is strictly linear.
Inulin is primarily found in animals, while starch is found in plants.
Inulin forms a helical structure, while starch forms a sheet-like structure.
Inulin is composed of fructose units linked by β(2→1) glycosidic bonds, while starch primarily consists of glucose units linked by α(1→4) and α(1→6) bonds.
Why doesn't cellulose react with iodine to produce a blue color?
It lacks the helical structure necessary for iodine complexation.
It contains fructose units instead of glucose.
It is a branched polymer and cannot interact with iodine.
It is insoluble in water, preventing the reaction with iodine.
Agar, a polysaccharide extracted from certain red algae, is widely used as a solidifying agent in microbiological media. Which of the following structural features contributes most to agar's gelling properties?
High degree of branching similar to glycogen.
Presence of β(1→4) glycosidic linkages exclusively.
The presence of sulfated galactose residues and the formation of double helices.
Its ability to form highly crystalline structures similar to cellulose.
Name the disaccharide which is the major sugar of insect haemolymph
Trehalose
Chitin
Cellulose
All of these
