Biomolecules — Important Questions
ICSE · Class 11 · Biology
103 important questions from Biomolecules for ICSE Class 11 Biology, with answers. Includes mcq and multiple choice questions.
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Important Questions from Biomolecules
Which of the following is a non-reducing sugar?
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Sucrose
Sucrose is the only common non-reducing disaccharide. Its glycosidic bond uses BOTH carbonyl (reducing) groups of glucose and fructose, leaving no free carbonyl group to reduce Fehling's or Benedict's solution.
Starch gives a blue-black colour with iodine because of its:
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Amylose component
Amylose (the straight-chain component of starch, 15-20%) forms a helical structure that traps iodine molecules, producing a blue-black complex. Amylopectin gives red-purple; glycogen gives purple-red.
Which of the following is the animal storage polysaccharide?
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Glycogen
Glycogen is the animal storage carbohydrate, stored mainly in the liver and muscles. Starch is the plant equivalent. Cellulose and chitin are structural polysaccharides.
The term "enzyme" was coined by:
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Friedrich Wilhelm Kuhne
Kuhne (1878) coined the term "enzyme" from the Greek words "en" (in) and "zyma" (yeast). Sumner (1926) isolated the first enzyme (urease) in crystalline form and proved enzymes are proteins.
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