7 public questions tagged with this topic.
Cellulose, a polysaccharide, is the primary structural component of plant cell walls.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
Algal walls may contain cellulose, galactans, mannans and minerals such as calcium carbonate. In other plants, the wall is composed of cellulose, hemicellulose, pectins and proteins.
Ref: NCERT Class 11 Biology Chapter 8: Cell: The Unit of Life Eukaryotic Cell - Cell Wall and Cell Membrane - Fluid Mosaic Model
Phaeophyceae (brown algae) have cell walls made of cellulose and algin, a hydrocolloid.
Ref: NCERT Class 11 Biology Chapter 3: Plant Kingdom Algae - Phaeophyceae and Rhodophyceae
Brown algae Phaeophyceae within stramenopiles display olive-brown hue due to dominance of accessory light harvesting carotenoid fucoxanthin over chlorophyll a, chlorophyll c1 and c2, and beta-carotene pigments. Fucoxanthin bound to fucoxanthin-chlorophyll a/c protein complexes absorbs blue-green light 450 to 540 nanometers abundant at moderate depths, efficiently transferring excitation to chlorophyll a for photosynthesis. Pigment composition masks green chlorophyll, conferring characteristic coloration to kelps, rockweeds, and Sargassum. Unlike phycoerythrin providing red coloration in red algae and phycocyanin blue in cyanobacteria, fucoxanthin pigment defines brown algal ecological niche.
Ref: Alexopoulos Introductory Mycology Oomycetes cellulose wall not chitin; Campbell Biology 11th ed., Chapter 31 Oomycetes differ fungi cellulose glucan
Amylose has α(1→4) linkages, cellulose has β(1→4) linkages accurately describes the key difference, similarity, or comparative feature asked about in this question. In Carbohydrates, the ability to compare and contrast related concepts is essential for deeper understanding. The distinguishing feature described by Amylose has α(1→4) linkages, cellulose has β(1→4) linkages reflects fundamental differences in structure, function, mechanism, or origin between the compared entities. The other options (Amylose is found in animal tissues, cellulose in plants, Cellulose is used for energy storage, amylose is for structural support, and Cellulose is a reducing sugar, amylose is non-reducing) either state incorrect comparisons, confuse the properties of the entities being compared, or describe features that are actually shared rather than different.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
Strong hydrogen bonding between chains is the scientifically accurate answer to this question. Within the study of Carbohydrates, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of Strong hydrogen bonding between chains directly address what is being asked. Among the other options, Its linear structure, Its α(1→4) glycosidic linkage, and Presence of hydrophobic groups do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
β(1→4) is the correct answer as it accurately identifies the biological location, composition, or distribution described in this question. In Carbohydrates, the spatial organization and localization of molecules are critical to their function. β(1→4) is specifically associated with the structure or compartment mentioned because of its unique biochemical properties and physiological role. The other options (α(1→4), α(1→6), and β(1→6)) are primarily associated with different cellular compartments, tissues, or structural contexts.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
