Biomolecules — Practice Quiz
ICSE · Class 11 · Biology
Try a 4-question quiz on Biomolecules for ICSE Class 11 Biology: tap an answer to check it and see why. 103 questions in the full chapter test.
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Quick Quiz: Biomolecules
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Which of the following correctly explains why sucrose is a non-reducing sugar while maltose is a reducing sugar?
Amylose gives a blue-black colour with iodine while amylopectin gives a red-purple colour. Which structural feature of amylose is responsible for this difference?
A patient with lactose intolerance lacks the enzyme lactase. Which correctly describes the consequence at the molecular level?
The Michaelis-Menten constant (Km) of enzyme A is 0.01 mM and that of enzyme B is 5 mM for the same substrate. Which conclusion is most accurate?
Sample Questions
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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