Which polysaccharide is present in the exoskeleton of arthropods?
Chitin is a polysaccharide found in the exoskeleton of arthropods.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
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Which of the following is a structural polysaccharide found in arthropod exoskeletons?
Chitin is a polysaccharide that forms the exoskeleton of arthropods and fungal cell walls.
Ref: NCERT Class 11 Biology Chapter 9: Biomolecules Proteins and Polysaccharides - Structure and Functions
An organism absorbs soluble organic matter from dead material, has a wall containing chitin and stores reserve food as g
The organism belongs to Kingdom Fungi. Fungi are absorptive heterotrophs, their walls contain chitin and other polysaccharides, and their reserve food is stored as glycogen and oil droplets.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Five Kingdom Classification and Kingdom Plantae Animalia
Which of the following groups has cell walls composed of chitin and polysaccharides?
Fungal cell walls are composed of chitin and polysaccharides.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Bacteria - Structure and Economic Importance
Cell wall of fungi is mainly composed of
Fungal cell wall provides rigidity, osmotic protection and shape differing chemically from plant cell wall. Major structural polysaccharide is chitin, polymer of beta-1,4-linked N-acetylglucosamine forming microfibrils crosslinked with beta-glucans and mannoproteins for strength. Chitin also occurs in arthropod exoskeletons, absent in plants which use cellulose. Cellulose predominates in oomycetes and plants, peptidoglycan in bacteria, silica in diatoms. Chitin synthesis via chitin synthases at hyphal tips confers resistance to microbial enzymes, serves as target for antifungal drugs like echinocandins affecting glucan assembly and mycoses treatment.
Ref: Campbell Biology 12th ed., Chapter 31: Fungi Cell Wall Chitin; NCERT Class 11 Biology Chapter 2 Fungi; NCBI Medical Mycology
Oomycetes differ from fungi because they have
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
The unique cell wall of organisms in Kingdom Fungi is primarily composed of:
Organisms in Kingdom Fungi exhibit exceptional diversity in morphology and habitat. However, a major unifying feature is their cellular architecture. According to the NCERT Biological Classification chapter, unlike plants which have cellulosic cell walls, the cell walls of all fungi are distinctly composed of a tough, complex structural carbohydrate called chitin, combined with various polysaccharides. This provides extreme structural durability.
Ref: NCERT Class 11 Biology > Chapter 2: Biological Classification > 2.3 Kingdom Fungi
What is the major function of chitin in arthropods?
Mannose accurately defines or describes the concept asked in this question. Within Carbohydrates, precise definitions and terminology are essential for clear scientific communication. The other options (Ribose, Sorbitol, and Xylitol) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
What is the function of chitin in arthropods?
Structural support accurately defines or describes the concept asked in this question. Within Carbohydrates, precise definitions and terminology are essential for clear scientific communication. The other options (Energy storage, Cell signaling, and Enzyme activity) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7
What type of bond is found between the monosaccharide units in chitin?
β(1→4) is the accurate classification or categorization for the organism, molecule, or concept described in this question. In Carbohydrates, proper classification is based on shared characteristics including morphological, biochemical, genetic, and evolutionary criteria. β(1→4) meets the specific diagnostic features and defining criteria that distinguish it from related groups. The other options (α(1→4), α(1→6), and β(1→6)) belong to different taxonomic groups, represent different classification levels, or possess distinct characteristics that exclude them from this category.
Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7