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Biomolecules

ICSE · Class 11 · Biology

Practice quiz for Biomolecules — ICSE Class 11 Biology. MCQs and questions with answers to test your preparation.

103 questions44 flashcards5 concepts

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Quick Quiz: Biomolecules

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1

Which of the following correctly explains why sucrose is a non-reducing sugar while maltose is a reducing sugar?

2

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?

3

A patient with lactose intolerance lacks the enzyme lactase. Which correctly describes the consequence at the molecular level?

4

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?

103 Questions·
mcqmultiple choice

Sample Questions

1mcq

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.

2mcq

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.

3mcq

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.

4mcq

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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Frequently Asked Questions

What are the important topics in Biomolecules for ICSE Class 11 Biology?
Key topics in Biomolecules include Pie chart showing the percentage composition of elements in human body and living organisms, Mind map showing the classification of carbohydrates into monosaccharides, oligosaccharides, and polysaccharides with examples, Classification of monosaccharides by number of carbon atoms and functional groups. These are the concepts ICSE Class 11 examiners draw on most — study them first, then practise related questions.
How to score full marks in Biomolecules — ICSE Class 11 Biology?
Understand the core concepts first, then work through the 103 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

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Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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