Biomolecules — NEET Biology Questions 2026

Glycogen is a polysaccharide found in the acid-insoluble fraction, not in the acid-soluble pool.

Inhibitor near active site prevents ES complex formation. Beyond optimum temperature, enzyme denatures, losing catalytic ability.

The order of nitrogenous bases in DNA determines genetic instructions and codes for proteins.

The Assertion is true as NCERT classifies reactions by energy changes. However, NCERT states “If ‘P’ is at a lower level than ‘S’, the reaction is an exothermic reaction” - the Reason incorrectly places the product at higher energy level, when exothermic reactions have products at lower energy levels.

The question evaluates the understanding of ash formation and its chemical composition. S1: Correct. Ash is formed by fully burning dried tissue, implying that water has already evaporated during the drying process. S2: Correct. During complete combustion, all carbon compounds are indeed oxidized to gaseous forms like CO2 and water vapour and are removed. S3: Incorrect. As stated in S2, all carbon compounds (including carbohydrates and amino acids) are oxidized and removed. Therefore, ash does not contain unoxidized carbohydrates and amino acids. S4: Correct. Ash contains inorganic elements like calcium and magnesium, which are stable and remain after combustion. S5: Incorrect. NCERT states that 'Inorganic compounds like sulphate, phosphate, etc., are also seen in the acid-soluble fraction.' This implies they are components of the living tissue extractable before combustion, not major constituents remaining in the ash after complete combustion. Ash primarily contains inorganic *elements*. Therefore, statements S3 and S5 are NOT correct.