BIOLOGY NEET PYQ QUIZ:BIOMOLECULES AND ENZYMES

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BIOLOGY NEET PYQ : BIOMOLECULES AND ENZYMES

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BIOMOLECULES AND ENZYMES

Competitive inhibition

In simple reversible competitive inhibition, which parameter remains unchanged?

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BIOMOLECULES AND ENZYMES

Fatty acids

NEET-UG 2024 Re-Examination

Which of the following are not fatty acids?

  1. Glutamic acid
  2. Arachidonic acid
  3. Palmitic acid
  4. Lecithin E. Aspartic acid

Choose the correct combination.

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BIOMOLECULES AND ENZYMES

Lecithin

NEET-UG 2024

Lecithin, an organic compound found in living tissues, is an example of:

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BIOMOLECULES AND ENZYMES

Reducing sugars

Which of the following is a non-reducing sugar?

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BIOMOLECULES AND ENZYMES

Enzyme inhibition

NEET-UG 2024

Inhibition of succinate dehydrogenase by malonate is a classical example of:

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BIOMOLECULES AND ENZYMES

Biological catalysts

Which statement about enzymes is correct?

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BIOMOLECULES AND ENZYMES

Cofactor of carboxypeptidase

NEET-UG 2024

The cofactor required by the enzyme carboxypeptidase is:

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BIOMOLECULES AND ENZYMES

Protein structure

NEET-UG 2024 Re-Examination

Match the levels of protein structure with the appropriate descriptions.

List I List II
A. Primary structure I. Human haemoglobin
B. Secondary structure II. Disulphide bonds
C. Tertiary structure III. Polypeptide chain sequence
D. Quaternary structure IV. Alpha helix and beta sheet

 

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BIOMOLECULES AND ENZYMES

PURINE BASES

Which pair consists entirely of purine bases?

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BIOMOLECULES AND ENZYMES

Bonds hydrolysed by enzymes

NEET-UG 2024

Match the enzymes with the bonds they act upon.

List I List II
A. Lipase I. Peptide bond
B. Nuclease II. Ester bond
C. Protease III. Glycosidic bond
D. Amylase IV. Phosphodiester bond

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BIOMOLECULES AND ENZYMES

Protein, hormone and transporter matching

NEET-UG 2024

Match List I with List II.

List I List II
A. GLUT-4 I. Hormone
B. Insulin II. Enzyme
C. Trypsin III. Intercellular ground substance
D. Collagen IV. Enables glucose transport into cells

 

Choose the correct sequence.

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BIOMOLECULES AND ENZYMES

Enzyme class

NEET-UG 2024 Re-Examination

Enzymes that remove groups from substrates by mechanisms other than hydrolysis, often leaving a double bond, belong to which class?

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BIOMOLECULES AND ENZYMES

RNA sugar

Which sugar is present in RNA?

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BIOMOLECULES AND ENZYMES

Storage carbohydrate in animals

The principal storage polysaccharide in animals is:

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BIOMOLECULES AND ENZYMES

Cellulose

Cellulose is composed primarily of:

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BIOMOLECULES AND ENZYMES

Enzyme specificity

The region of an enzyme that binds its substrate and participates directly in catalysis is the:

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BIOMOLECULES AND ENZYMES

Repeated concept: enzyme prosthetic groups

NEET-UG 2019

Consider the following statements about enzyme prosthetic groups:

  1. A coenzyme or metal ion tightly bound to an enzyme protein may act as a prosthetic group.
  2. Every enzyme functions independently of cofactors.

Which statement is correct?

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BIOMOLECULES AND ENZYMES

Effect of substrate concentration

NEET-UG 2024 Re-Examination

Which graph represents the effect of substrate concentration on the velocity of an enzyme-catalysed reaction?

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BIOMOLECULES AND ENZYMES

Bond between amino acids

Amino acids in a polypeptide are linked by:

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BIOMOLECULES AND ENZYMES

Cofactors

The protein portion of a conjugated enzyme without its required cofactor is called the:

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DISCLAIMER

This educational material is prepared for Biology learning and NEET-UG preparation. Questions are intended for practice and revision. The year and examination name should be included only when the question’s appearance in that examination can be established from a reliable source. Some questions may be adapted from previous-year question patterns and should not be treated as verbatim official questions unless verified against the original paper. The author and website are not responsible for discrepancies in unofficial question compilations. Refer to the official NTA/NEET question papers and answer keys for confirmation.

Part 1: Complete Theory

1. INTRODUCTION TO BIOMOLECULES

Biomolecules are chemical compounds found in living organisms. They form cellular structures, store and release energy, regulate metabolism and carry genetic information.

The major biomolecules include carbohydrates, proteins, lipids, nucleic acids, and several smaller molecules such as amino acids, nucleotides, vitamins and metabolic intermediates.

1.1 CHEMICAL COMPOSITION OF LIVING ORGANISMS

Living organisms contain both inorganic and organic substances.

Inorganic constituents: Water, mineral salts and dissolved ions.

Organic constituents: Carbohydrates, proteins, lipids, nucleic acids and other carbon-containing compounds.

Water is generally the most abundant chemical component of cells. Organic compounds are essential for cell structure, energy storage, catalysis and heredity.

1.2 ANALYSIS OF CHEMICAL CONSTITUENTS

Biologists study cellular composition by analysing living tissues and their chemical components.

  1. Elemental analysis: Determines the elements present in biological material, such as carbon, hydrogen, oxygen, nitrogen, phosphorus and sulphur.
  2. Compound analysis: Identifies individual compounds such as glucose, amino acids, fatty acids and nucleotides.
  3. Acid-soluble fraction: Generally contains small molecules, including sugars, amino acids, nucleotides and organic acids.
  4. Acid-insoluble fraction: Generally contains macromolecules and cellular structures, including proteins, nucleic acids, polysaccharides and membrane-associated lipids.

NEET concept: Lipids have relatively low molecular masses compared with many macromolecules, but they are commonly recovered in the acid-insoluble fraction because they occur largely in membranes and other aggregates.

2. CARBOHYDRATES

Carbohydrates are organic compounds composed mainly of carbon, hydrogen and oxygen. They are important energy sources and structural materials.

2.1 Classification of carbohydrates

Monosaccharides

The simplest carbohydrates; they cannot be hydrolysed into smaller carbohydrate units.

Examples: glucose, fructose, ribose and deoxyribose.

Oligosaccharides

Contain a small number of monosaccharide units. Disaccharides are particularly important.

Examples: sucrose, maltose and lactose.

Polysaccharides

Long chains of monosaccharide units that serve storage or structural functions.

Examples: starch, glycogen, cellulose and chitin.

2.2 IMPORTANT MONOSACCHARIDES

MonosaccharideImportance
GlucoseMajor cellular respiratory substrate
FructoseCommon fruit sugar
RiboseComponent of RNA and ATP
DeoxyriboseComponent of DNA
GalactoseComponent of lactose

Monosaccharides can be classified by the number of carbon atoms. For example, glucose is a hexose, while ribose is a pentose.

2.3 DISACCHARIDES

Disaccharides consist of two monosaccharides joined by a glycosidic bond.

DisaccharideComponents
SucroseGlucose + fructose
MaltoseGlucose + glucose
LactoseGlucose + galactose

Sucrose is a non-reducing sugar, whereas maltose and lactose are reducing sugars.

2.4 POLYSACCHARIDES

Starch: The principal storage carbohydrate in plants. It contains amylose and amylopectin.

Glycogen: The principal storage polysaccharide in animals; it is highly branched and is also present in fungi.

Cellulose: A structural polysaccharide of plant cell walls, composed of β-glucose units.

Chitin: A structural polysaccharide found in arthropod exoskeletons and fungal cell walls.

NEET distinction: Humans can digest starch but lack the enzyme cellulase needed to digest cellulose.

3. LIPIDS

Lipids are a diverse group of hydrophobic or amphipathic compounds. They are important for energy storage, membrane formation, insulation and cell signalling.

3.1 TYPES OF LIPIDS

Fats and oils: Composed mainly of glycerol and fatty acids; serve as energy reserves.

Phospholipids: Major components of biological membranes, with hydrophilic heads and hydrophobic tails.

Waxes: Provide protective, water-resistant coatings.

Steroids: Include cholesterol and several steroid hormones.

3.2 FATTY ACIDS

Fatty acids contain a carboxyl group and a hydrocarbon chain.

Saturated fatty acids: Contain no carbon–carbon double bonds in the hydrocarbon chain.

Unsaturated fatty acids: Contain one or more carbon–carbon double bonds.

Triglycerides contain one glycerol molecule linked to three fatty acids by ester bonds. Unlike proteins and nucleic acids, most lipids are not true polymers composed of repeating monomer units.

NEET focus: Phospholipids are amphipathic, whereas triglycerides are primarily energy-storage molecules.

4. PROTEINS

Proteins are biological macromolecules composed of amino acids joined by peptide bonds. They perform structural, catalytic, transport, regulatory, defensive and contractile functions.

4.1 AMINO ACIDS

A typical amino acid contains:

An amino group (–NH₂)

A carboxyl group (–COOH)

A hydrogen atom

A variable side chain (R group)

These groups are attached to the alpha carbon in most protein-forming amino acids.

There are 20 standard amino acids commonly used to build proteins. Their different R groups determine their chemical properties.

4.2 PEPTIDE BOND

A peptide bond forms between the carboxyl group of one amino acid and the amino group of another, with the elimination of water in the conventional condensation representation.

Two amino acids form a dipeptide; additional amino acids form longer peptides and polypeptides.

4.3 LEVELS OF PROTEIN STRUCTURE

Primary structure

The specific sequence of amino acids in a polypeptide chain.

Secondary structure

Local folding, especially the alpha helix and beta-pleated sheet, stabilised mainly by hydrogen bonds between backbone groups.

Tertiary structure

The overall three-dimensional folding of a single polypeptide chain.

Quaternary structure

The arrangement of multiple polypeptide subunits in a functional protein, as in haemoglobin.

4.4 FIBROUS AND GLOBULAR PROTEINS

FeatureFibrous proteinsGlobular proteins
General shapeLong and fibre-likeCompact and rounded
SolubilityOften poorly solubleOften water-soluble
Main roleStructural supportDiverse functional roles
ExamplesCollagen, keratinHaemoglobin, many enzymes

4.5 DENATURATION OF PROTEINS

Denaturation is the disruption of a protein’s native conformation by factors such as heat, extreme pH or certain chemicals.

It commonly affects secondary, tertiary and quaternary structures without breaking all the peptide bonds of the primary structure.

Example: Heating egg white causes its proteins to denature and coagulate.

5. NUCLEIC ACIDS

Nucleic acids store, transmit and help express genetic information. The two principal types are DNA and RNA.

5.1 NUCLEOSIDES AND NUCLEOTIDES

Nitrogenous base + pentose sugar = nucleoside.

Nucleoside + phosphate group(s) = nucleotide.

The nitrogenous bases are classified into two groups:

Purines: Adenine (A) and guanine (G).

Pyrimidines: Cytosine (C), thymine (T) and uracil (U).

5.2 DNA AND RNA

FeatureDNARNA
SugarDeoxyriboseRibose
BasesA, G, C, TA, G, C, U
Usual structureDouble-strandedOften single-stranded
Major roleGenetic information storageGene expression and other cellular functions

DNA nucleotides are connected through 3′–5′ phosphodiester bonds. In double-stranded DNA, adenine pairs with thymine and guanine pairs with cytosine.

RNA includes messenger RNA (mRNA), transfer RNA (tRNA) and ribosomal RNA (rRNA), among other functional types.

5.3 ATP

Adenosine triphosphate (ATP) consists of adenine, ribose and three phosphate groups. It is a major energy-transfer molecule in cells.

ATP supports biosynthesis, active transport, muscle contraction and numerous other cellular processes.

6. OTHER IMPORTANT BIOMOLECULES

Vitamins

Vitamins are organic compounds required in small quantities for normal physiological functions.

VitaminGeneral importance
AVision and epithelial health
B₁Carbohydrate metabolism
B₉DNA synthesis and cell division
B₁₂Red blood cell formation and nervous system function
CCollagen synthesis and antioxidant functions
DCalcium and phosphate homeostasis
EAntioxidant protection
KBlood clotting

MINERALS AND COFACTORS

Mineral ions such as magnesium, iron, zinc and calcium participate in biological processes. Some enzymes require non-protein components called cofactors.

Cofactor: A non-protein component required for the activity of certain enzymes.

Coenzyme: An organic cofactor, often derived from vitamins.

Prosthetic group: A cofactor that is tightly bound to its associated protein.

Apoenzyme: The protein portion of an enzyme without its required cofactor.

Holoenzyme: The complete, active enzyme system consisting of the apoenzyme and its required cofactor.

7. ENZYMES

Enzymes are biological catalysts that increase the rate of chemical reactions by lowering the activation energy. Most enzymes are proteins, although some RNA molecules, called ribozymes, also catalyse reactions.

Enzymes accelerate reactions without being consumed in the overall process. They do not change the overall free-energy difference between reactants and products or the equilibrium constant.

7.1 PROPERTIES OF ENZYMES

  1. Enzymes are highly efficient biological catalysts.
  2. They often show specificity for their substrates and reactions.
  3. Their activity depends on conditions such as temperature and pH.
  4. Many require metal ions or organic cofactors.
  5. They can be regulated by inhibitors, activators and cellular conditions.
  6. They do not change the final equilibrium position of a reversible reaction.

7.2 ENZYME–SUBSTRATE COMPLEX

An enzyme binds to its substrate at a specific region called the active site.

The reaction takes place in the following steps:

E + S ⇌ ES → E + P

Where:

E = Enzyme

S = Substrate

ES = Enzyme-substrate complex

P = Product

At the end of the reaction, the product is released, and the enzyme remains unchanged. It can be used again for another reaction.

7.3 LOCK-AND-KEY AND INDUCED-FIT MODELS

Lock-and-key model: The active site is described as complementary to the substrate.

Induced-fit model: Substrate binding promotes a change in enzyme conformation that helps achieve an effective catalytic arrangement.

The induced-fit model better captures the flexibility of many enzyme active sites.

7.4 FACTORS AFFECTING ENZYME ACTIVITY

Temperature

Activity generally increases with temperature up to an optimum. Beyond this range, many enzymes lose activity because their structures are disrupted.

pH

Each enzyme has a suitable pH range. Changes in pH can alter the ionisation of active-site residues and the enzyme’s structure.

Substrate concentration

When the substrate concentration is low, increasing the substrate concentration usually increases the reaction rate.

When the substrate concentration becomes high, most of the enzyme active sites become occupied. The enzyme reaches saturation, and the reaction rate approaches its maximum value, called Vmax.

7.5 MICHAELIS–MENTEN EQUATION

For a simple enzyme-catalysed reaction, the reaction rate can be calculated using the Michaelis-Menten equation:

v = (Vmax x [S]) / (Km + [S])

Where:

v = Initial reaction rate

Vmax = Maximum reaction rate under specific conditions

[S] = Substrate concentration

Km = Michaelis constant

Important points:

  1. When the substrate concentration ([S]) is equal to Km, the reaction rate (v) is half of Vmax.
  2. A lower Km value can indicate greater apparent affinity between an enzyme and its substrate under the simple Michaelis-Menten model.
  3. Km is not always a direct measure of binding affinity because it depends on the rates of the enzyme-catalysed reaction.

Top of Form

Bottom of Form

7.6 ENZYME INHIBITION

Types of Enzyme Inhibition

1. Competitive Inhibition: The inhibitor competes with the substrate for the active site of the enzyme. In this type of inhibition, the apparent Km value increases, but Vmax remains unchanged. Increasing the substrate concentration can reduce the effect of competitive inhibition.

2. Pure Non-Competitive Inhibition: The inhibitor reduces the effective activity of the enzyme. In this type of inhibition, Vmax decreases, but Km remains unchanged.

3. Uncompetitive Inhibition: The inhibitor binds only to the enzyme-substrate complex. In this type of inhibition, both the apparent Km and Vmax values decrease.

7.7 CLASSIFICATION OF ENZYMES

The traditional NCERT/NEET presentation commonly uses six major classes:

ClassMain reaction typeExample
OxidoreductasesOxidation–reductionDehydrogenases
TransferasesTransfer of functional groupsTransaminases
HydrolasesBond cleavage using waterLipases
LyasesAddition or removal of groups without hydrolysis or oxidationDecarboxylases
IsomerasesIntramolecular rearrangementsPhosphoglucose isomerase
LigasesJoining molecules, often coupled to ATP hydrolysisDNA ligase

Modern enzyme nomenclature also recognises a seventh class, translocases, which catalyse the movement of ions or molecules across membranes or their separation within membranes. For NEET questions, follow the classification specified in the relevant NCERT edition or examination syllabus.

7.8 ENZYMES IN DIGESTION

EnzymeSubstrateMajor product(s)
Salivary amylaseStarchSmaller carbohydrates
PepsinProteinsSmaller peptides
TrypsinProteins and peptidesSmaller peptides
Pancreatic lipaseTriglyceridesFatty acids and monoacylglycerols, with further products depending on conditions
MaltaseMaltoseGlucose
LactaseLactoseGlucose and galactose

Important distinction: Enzymes are not limited to digestion. They also function in DNA replication, transcription, respiration, photosynthesis, cell signalling and metabolic regulation.

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