#proteoglycans

Cell Communication

Incorrect statement about GAGs and proteoglycans: (June 2020)

GAGs attach to Asn residues, 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

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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Carbohydrates

The function of proteoglycans is:

Providing hydration and structural support to tissues is the accurate answer because it correctly identifies the biological function or role described in this question. In Carbohydrates, understanding the specific functions of molecules, enzymes, or structures is fundamental. Providing hydration and structural support to tissues fulfills this particular biological role through its specific structural properties, biochemical activity, or physiological mechanism. The other options (Energy storage, Forming peptide bonds, and Transporting lipids) serve different biological functions or are associated with other processes, pathways, or structural roles within the cell or organism.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 7

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Carbohydrates

What distinguishes proteoglycans from glycoproteins?

Proteoglycans have larger carbohydrate content 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 Proteoglycans have larger carbohydrate content reflects fundamental differences in structure, function, mechanism, or origin between the compared entities. The other options (Glycoproteins contain sulfated sugars, Proteoglycans do not have glycosidic bonds, and Glycoproteins are always intracellular) 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

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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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