Are these practice questions for Biomolecules based on the CBSE pattern?

Yes. Every practice question is modeled on the CBSE Class 11 - Science Biology exam pattern — including MCQs, assertion-reason questions, and short-answer formats that frequently appear in CBSE papers.

Are the practice questions for Biomolecules free?

Yes. Every chapter includes free practice questions for Class 11 - Science students to get you started.

What types of questions are included?

The practice set for Biomolecules mainly includes MCQs and CBSE-style short-answer questions, with instant feedback on each answer. For full-length textbook practice, use the NCERT Solutions page.

Are the practice questions suitable for board exam preparation?

Yes. The questions test the same concepts and depth that CBSE asks in board exams. After finishing, also solve the NCERT and NCERT Exemplar exercises for Biomolecules for full coverage.

How many practice questions are there for Biomolecules?

The number scales with chapter length and concept density. Each chapter typically has 15-50 practice questions across MCQ and short-answer formats.

Biomolecules Class 11 Biology Practice Questions with Answers

easy

Justify why a continuous increase in substrate concentration does not lead to an infinite increase in the velocity of an enzyme-catalyzed reaction.

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easy

Define biomacromolecules and list two examples.

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easy

Name the most abundant protein in the animal world and the most abundant protein in the whole biosphere.

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easy

Propose a scientific reason why the relative abundance of carbon and hydrogen is significantly higher in living organisms compared to the non-living Earth's crust.

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easy

Compare and contrast saturated and unsaturated fatty acids based on their chemical structure and provide one example of each.

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easy

Name the specific type of covalent bond that links amino acids together in a protein.

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easy

Identify the three chemically distinct components of a nucleotide.

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easy

Name the two fractions obtained when a living tissue is ground with trichloroacetic acid (

Cl_3CCOOH

) and filtered.

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easy

Justify why a protein is considered a heteropolymer, while cellulose is considered a homopolymer.

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easy

Analyze the structural and functional relationship between an apoenzyme and a holoenzyme.

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medium

Compare the primary and tertiary structures of a protein. Analyze why the tertiary structure is considered absolutely necessary for the biological activities of proteins.

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medium

Compare the chemical composition of a nucleotide found in DNA with a nucleotide found in RNA.

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medium

Based on the structure of a fatty acid, formulate an explanation for why lipids are generally insoluble in water. Distinguish between the properties of saturated and unsaturated fatty acids in your explanation.

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medium

Evaluate the significance of the quaternary structure of a protein, using human hemoglobin (Hb) as an example. How does this level of organization contribute to its function which a single polypeptide chain might not achieve?

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medium

An enzyme catalyzes the transfer of an amino group from an amino acid to a keto acid. Analyze which of the six major classes of enzymes this catalyst belongs to and justify your classification.

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medium

Create a classification scheme in the form of a simple flowchart to distinguish between a nitrogenous base, a nucleoside, and a nucleotide. Provide one specific example for each category.

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medium

Describe how temperature and pH affect the activity of an enzyme.

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medium

Design an experiment to qualitatively identify the presence of protein, starch (a polysaccharide), and a simple sugar (monosaccharide) in three unknown food samples labeled A, B, and C. Justify the choice of reagents for each test.

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medium

Explain the difference between a homopolymer and a heteropolymer, using one example for each from the chapter.

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medium

Explain the difference between a nucleoside and a nucleotide. Provide one example of each.

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medium

Analyze why lipids, which have a molecular weight not exceeding

800

Da and are therefore not strictly macromolecules, are found in the acid-insoluble fraction during the chemical analysis of a living tissue.

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medium

Demonstrate how a generic

\alpha

-amino acid with the structure R-CH(

\text{NH}_2

)-COOH exists as a zwitterion in a solution of neutral pH.

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medium

Analyze the functional differences between primary and secondary metabolites, using one example for each to illustrate your points.

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medium

Apply the concept of activation energy to explain how enzymes bring about such high rates of chemical conversions.

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medium

Define the term 'zwitterion' in the context of amino acids.

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medium

Design a graphical representation to compare the activation energy of a reaction with and without an enzyme. Your design must illustrate an exothermic reaction and clearly label the substrate (S), product (P), transition state, activation energy without enzyme (

E_{au}

), and activation energy with enzyme (

E_{ac}

).

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medium

Examine the relationship between substrate concentration and enzyme activity as depicted in a velocity vs. substrate concentration graph. Analyze why the reaction rate reaches a maximum velocity (

V_{\text{max}}

) and does not increase further with an additional increase in substrate concentration.

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medium

Propose a reason why certain nucleic acids that act as enzymes are called 'ribozymes', and state the central biological concept their discovery challenged.

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medium

Compare the relative abundance of Carbon (C) and Silicon (Si) in the Earth's crust versus the human body, as shown in Table 9.1. Analyze the significance of this difference for living organisms.

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medium

Evaluate the roles of primary and secondary metabolites in a plant. Critique the notion that secondary metabolites are simply 'waste products' by providing examples of their ecological and human-welfare importance.

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medium

List the four levels of protein structure and briefly describe what the primary structure represents.

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medium

Explain why lipids are considered part of the acid-insoluble fraction despite having a molecular weight of less than 800 Da.

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medium

Analyze the statement: 'A protein is a heteropolymer, not a homopolymer.'

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medium

Evaluate the statement: 'Lipids are not strictly macromolecules, yet they are found in the acid-insoluble fraction.' Justify your evaluation based on their molecular weight and behavior during chemical analysis.

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medium

Critique the method of determining the inorganic composition of a living tissue by burning it to 'ash'. What crucial information is lost in this process, and why is a different method required for organic analysis?

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medium

Describe the general structure of an

\alpha

-amino acid.

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hard

Explain the role of co-factors in enzyme function and describe the three main types.

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hard

A new enzyme is discovered that functions optimally at

95^{\circ}\text{C}

. Propose a likely natural source for this enzyme and justify why its tertiary structure remains stable at such high temperatures, unlike most enzymes from mesophilic organisms.

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hard

Compare the mechanism of a competitive inhibitor with the normal binding of a substrate to an enzyme's active site. Apply this comparison to explain the inhibition of succinic dehydrogenase by malonate.

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hard

Examine the structural reason why starch forms a blue-colored complex with iodine molecules while cellulose, also a polymer of glucose, does not.

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hard

Create a hypothetical dipeptide using the amino acids Glycine and Alanine, where Glycine is the N-terminal amino acid. Draw its structure and clearly label the peptide bond, the N-terminus, and the C-terminus.

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hard

Summarize the key differences between primary and secondary metabolites, providing two examples for each.

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hard

List the six major classes of enzymes according to the international classification system.

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hard

Formulate a hypothesis to explain why competitive inhibitors are effective as drugs to control bacterial pathogens. Design a simple in-vitro experiment to test if a new chemical, 'Compound X', acts as a competitive inhibitor for a specific bacterial enzyme.

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hard

An enzyme is isolated from a thermophilic organism that lives in hot vents at

85^{\circ}\text{C}

. Analyze what would happen to its catalytic activity if the temperature is first lowered to

40^{\circ}\text{C}

and then raised back to

85^{\circ}\text{C}

.

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BiomoleculesClass 11 Biology Practice Questions