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#glycosaminoglycans

8 public questions tagged with this topic.

Regeneration -ll

During cortical granule reaction, glycosaminoglycans:

Cortical granules discharge heterogeneous mixture; glycosaminoglycans such as chondroitin sulfate proteoglycans are major osmotically active component. Upon release into narrow perivitelline space they rapidly hydrate and swell, generating high colloid osmotic pressure drawing water between vitelline envelope and plasma membrane. Resulting influx expands space beneath envelope lifting it outward to create perivitelline space and nascent fertilization envelope. Hardening occurs later via ovoperoxidase-mediated dityrosine crosslinking, while receptor removal depends on protease cleavage. Glycosaminoglycans do not harden envelope, digest receptors, or induce acrosomal exocytosis; their physical swelling provides elevating force essential for block.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Glycosaminoglycans and osmotic elevation of fertilization envelope.

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Sea urchin -l

During cortical granule reaction, glycosaminoglycans:

Among cortical granule components massively released during slow block to polyspermy are large sulfated mucopolysaccharides, hyaline and glycoproteins that hydrate explosively upon discharge into extracellular space. Their high colloid osmotic pressure and water-binding capacity draws surrounding seawater and ovular fluid into perivitelline space between egg plasma membrane and elevated vitelline envelope, causing dramatic space expansion and envelope elevation that physically separates sperm receptors from oolemma. Subsequent hardening by peroxidase-mediated dityrosine crosslinking and transglutaminase isopeptide crosslinking then freezes envelope in raised position. Glycosaminoglycan-driven swelling crucially creates space for lifting envelope, while proteases digest receptors and ovoperoxidase hardens structure independently.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Perivitelline space expansion by mucopolysaccharides.

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Cell Communication and ECM

Proteoglycans differ from glycoproteins mainly in having

Long unbranched GAG chains, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Cell Communication and ECM

Repeating disaccharide unit of GAGs consists of

Uronic acid + amino sugar, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Cell Communication and ECM

Hyaluronan differs from other GAGs because it is

Synthesized at plasma membrane, is consistent with established principles of cell signaling, receptor pharmacology and cellular regulation. Experimental measurements of binding parameters, genetic loss-of-function studies and pharmacological interventions all converge on the same interpretation. Related options address neighboring concepts but do not satisfy the precise criterion stated in the question.

Ref: NCERT Biology Class 11–12 Alberts et al Molecular Biology of the Cell Lodish et al, Molecular Cell Biology Cooper & Hausman, The Cell Abbas et al., Cellular and Molecular Immunology (for immunology sections)

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Carbohydrates

What is the function of glycosaminoglycans (GAGs)?

Structural support in connective tissues 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, Enzymatic catalysis, and Protein synthesis) 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

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Carbohydrates

Which sugar is used as a lubricant in joints and connective tissues?

Hyaluronic acid 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 Hyaluronic acid directly address what is being asked. Among the other options, Heparan sulfate, Cellobiose, and Galactitol 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

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Tissue

Proteoglycans and glycosaminoglycans are components of:

Correct option is C, Ground substance. In Tissue-2, the accurate description is Ground substance, and that is what you should commit to memory. Keep the definition tight and the role clear — Ground substance is the option that correctly names the structure, process, or principle asked for in Tissue-2. Then Ground substance is the answer you can defend. Check yourself by covering the options and writing the answer first, then matching the letter — that builds confidence. If the wording feels dense, translate it into everyday language first, then map that plain sentence back onto Ground substance. Remember that physiology questions reward precise language: name the process, the location, and the outcome, then match that to the option text.

Ref: Animal physiology is Unit 7 of the CSIR NET Life Science Syllabus, covering core body systems. It accounts for roughly 10% of the total marks in Sections B and C.

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