NEET Topic-wise & A
Topic 1: HOW TO ANALYSE CHEMICAL COMPOSITION, MICROMOLECULES
NEET: Previous Years Questions
01: Lecithin, a small molecular weight organic compound found in living tissues, is an example of:
(1) Amino acids
(2) Phospholipids
(2) Glycerides
(4) Carbohydrates (NEET 2024)
✅ (2) Phospholipids
02: Following are the statements with reference to 'lipids'. (NEET 2021)
(a) Lipids having only single bonds are called unsaturated fatty acids.
(b) Lecithin is a phospholipid.
(c) Trihydroxy propane is glycerol.
(d) Palmitic acid has 20 C-atoms including carboxyl carbon.
(e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.
(1) (a) and (b) only
(2) (c) and (d) only
(3) (b) and (c) only
(4) (b) and (e) only
✅ (3) (b) and (c) only
03: Identify the basic amino acid from the following.
(1) Lysine
(2) Valine
(3) Tyrosine
(4) Glutamic Acid (NEET 2020)
✅ (1) Lysine
04: The two functional groups characteristic of sugar are
(1) hydroxyl and methyl
(2) carbonyl and methyl
(3) carbonyl and phosphate
(4) carbonyl and hydroxyl (NEET 2018)
✅ (4) carbonyl and hydroxyl
05: A typical fat molecule is made up of
(1) one glycerol and one fatty acid molecule
(2) three glycerol and three fatty acid molecules
(3) three glycerol molecules and one fatty acid molecule
(4) one glycerol and three fatty acid molecules (NEET-I 2016)
✅ (4) one glycerol and three fatty acid molecules
06: A phosphoglyceride is always made up of
(1) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(2) a saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule
(3) only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
(4) only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached. (NEET 2013)
✅ (1) a saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached
Model Questions
07: The plant ash is the indication of
(1) Mineral salts absorbed by the plant
(2) Organic matter of the plant
(3) Both the mineral salts and organic matter
(4) None of the above
✅ (1) Mineral salts absorbed by the plant
08: Which is not correct related with acid soluble pool?
(1) It contains micromolecules having molecular weight less than 1000 Da
(2) Amino acids are found in acid soluble pool
(3) Lipids have molecular weight below 800 Da so it comes under acid soluble pool
(4) All are incorrect
✅ (3) Lipids have molecular weight below 800 Da so it comes under acid soluble pool
09: Regarding amino acids, odd man out.
(1) Aspartic acid
(2) Glutamic acid
(3) Palmitic acid
(4) Alanine
✅ (3) Palmitic acid
10: Which of the following sets are aromatic amino acids?
(1) Lysine, arginine
(2) Tyrosine, tryptophan, phenyl Alanine
(3) Aspartic acid, glutamic acid
(4) Glycine, Alanine, serine
✅ (2) Tyrosine, tryptophan, phenyl Alanine
11: Which of the following show Zwitterionic form in solutions of different pH?
(1) Glucose
(2) Alanine
(3) Diglyceride
(4) Glycerol
✅ (2) Alanine
12: The type sugar in DNA is
(1) Triose
(2) Tetrose
(3) Pentose
(4) Hexose
✅ (3) Pentose
13: Select the correct statement:
(1) General formula of fatty acids is R-COOH where R is long chain hydrocarbon
(2) General formula of fatty acids is R-COOH where R is any carbohydrate molecule
(3) General formula of fatty acids is R-CHO where R is long chain hydrocarbon
(4) General formula of fatty acids is R-CHO where R is any carbohydrate molecule
✅ (1) General formula of fatty acids is R-COOH where R is long chain hydrocarbon
Topic 2: BIOMACROMOLECULES (MACROMOLECULES)
NEET: Previous Years Questions
14: Match List-I with List-II: (NEET 2024)
Choose the correct answer from the options given below.
(1) A-IV, B-I, C-II, D-III
(2) A-I, B-II, C-III, D-IV
(3) A-II, B-III, C-IV, D-I
(4) A-III, B-IV, C-I, D-II
✅ (1) A-IV, B-I, C-II, D-III
15: Match List I with List II: (NEET 2024)
Choose the correct answer from the options given below:
(1) A-IV, B-II, C-III, D-I
(2) A-III, B-II, C-I, D-IV
(3) A-II, B-IV, C-I, D-III
(4) A-IV, B-I, C-III, D-II
✅ (3) A-II, B-IV, C-I, D-III
16: Given below are two statements: (NEET 2023)
Statement I: A protein is imagined as a line, the left end represented by first amino acid (C-terminal) and the right end represented by last amino acid (N-terminal).
Statement II: Adult human haemoglobin, consists of 4 subunits (two subunits of α type and two subunits of β type).
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are false.
(2) Statement I is true but Statement II is false.
(3) Statement I is false but Statement II is true.
(4) Both Statement I and Statement II are true.
✅ (3) Statement I is false but Statement II is true.
17: Cellulose does not form blue colour with Iodine because
(1) It is a helical molecule
(2) It does not contain complex helices and hence cannot hold iodine molecules
(3) It breaks down when iodine reacts with it
(4) It is a disaccharide (NEET 2023)
✅ (2) It does not contain complex helices and hence cannot hold iodine molecules
18: Match List - I with List - II. (NEET 2021)
Choose the correct answer from the options given below.
(a) (b) (c) (d)
(1) (iv) (i) (ii) (iii)
(2) (i) (iv) (iii) (ii)
(3) (ii) (i) (iv) (iii)
(4) (iv) (iii) (i) (ii)
✅ (1) (iv) (i) (ii) (iii)
19: Which of the following statements is correct?
(1) Adenine pairs with thymine through three H-bonds.
(2) Adenine does not pair with thymine.
(3) Adenine pairs with thymine through two H-bonds.
(4) Adenine pairs with thymine through one H-bond. (NEET 2020)
✅ (3) Adenine pairs with thymine through two H-bonds.
20: Which one of the following is the most abundant protein in the animals? (NEET 2020)
(1) Lectin
(2) Insulin
(3) Haemoglobin
(4) Collagen
✅ (4) Collagen
21: Identify the substances having glycosidic bond and peptide bond, respectively in their structure:
(1) Cellulose, lecithin
(2) Inulin, insulin
(3) Chitin, cholesterol
(4) Glycerol, trypsin (NEET 2020)
✅ (2) Inulin, insulin
22: Purines found both in DNA and RNA are:
(1) Adenine and thymine
(2) Adenine and guanine
(3) Guanine and cytosine
(4) Cytosine and thymine (NEET 2019)
✅ (2) Adenine and guanine
23: Which of the following glucose transporters is insulin-dependent? (NEET 2019)
(1) GLUT I
(2) GLUT II
(3) GLUT III
(4) GLUT IV
✅ (4) GLUT IV
24: Which one of the following statements is wrong?
(1) Uracil is a pyrimidine.
(2) Glycine is a sulphur containing amino acid.
(3) Sucrose is a disaccharide.
(4) Cellulose is a polysaccharide. (NEET-I 2016)
✅ (2) Glycine is a sulphur containing amino acid.
25: Which of the following are not polymeric?
(1) Proteins
(2) Polysaccharides
(3) Lipids
(4) Nucleic acids (NEET 2017)
✅ (3) Lipids
26: Which of the following is the least likely to be involved in stabilising the three-dimensional folding of most proteins?
(1) Hydrogen bonds
(2) Electrostatic interaction
(3) Hydrophobic interaction
(4) Ester bonds (NEET-II 2016)
✅ (4) Ester bonds
Model Questions
27: A peptide bond formation between two amino acids is accompanied by the
(1) Addition of H2O
(2) Deamination
(3) Decarboxylation
(4) Dehydration
✅ (4) Dehydration
28: How many peptide bonds will be there in a polypeptide chain with 50 amino acids?
(1) 49
(2) 50
(3) 51
(4) 52
✅ (1) 49
29: Structural levels of keratin, fibroin and haemoglobin are respectively
(1) Secondary, tertiary and quaternary
(2) Secondary, secondary and quaternary
(3) Tertiary, secondary and quaternary
(4) Secondary, quaternary and quaternary
✅ (2) Secondary, secondary and quaternary
30: Select the wrong statement:
(1) Proteins are heteropolymers of amino acids
(2) Ribozymes are nucleic acids with catalytic power
(3) Proteins, nucleic acids & polysaccharides are the only 3 types of macromolecules found in the living system
(4) Collagen is the most abundant protein in the whole of the biosphere and RuBisCO is the most abundant proteins in the animal world
✅ (4) Collagen is the most abundant protein in the whole of the biosphere and RuBisCO is the most abundant proteins in the animal world
31: In which of the following groups, all are polysaccharides?
(1) Glycogen, sucrose, maltose
(2) Glycogen, Inulin, starch
(3) Starch, Sucrose, glycogen
(4) Cellulose, starch, lactose
✅ (2) Glycogen, Inulin, starch
32: Chitin is found in
(1) Cell wall of fungi and Exoskeleton of crabs and prawns
(2) Exoskeleton of insects and cell wall of plants
(3) Exoskeleton of crabs and prawns and cell wall of algae
(4) Cell wall of fungi and exoskeleton of reptiles
✅ (1) Cell wall of fungi and Exoskeleton of crabs and prawns
33: Pick out the wrong pair:
(1) Adenine-sugar : N-glycosidic bond
(2) Purine-pyrimidine : Hydrogen bond
(3) Valine-histidine : Peptide bond
(4) Glucose-glucose : Ester bond
✅ (4) Glucose-glucose : Ester bond
34: Nucleic acids are the polymer of
(1) Nucleotides linked by phosphodiester bond
(2) Nucleosides linked by N-glycosidic bond
(3) Nucleosides linked by phosphodiester bond
(4) Nucleotides linked by N-glycosidic bond
✅ (1) Nucleotides linked by phosphodiester bond
35: The difference between RNA and DNA is because of
(1) Sugar & purine
(2) Sugar & phosphate
(3) Phosphate & base
(4) Sugar & pyrimidine
✅ (4) Sugar & pyrimidine
36: In a DNA, guanine content is 10%. What is the content of adenine?
(1) 40%
(2) 60%
(3) 10%
(4) 20%
✅ (1) 40%
37: Which of the following sequence is correct on the basis of increasing molecular weight?
(1) DNA, ATP, NADP, AMP
(2) ATP, AMP, DNA, NADP
(3) AMP, ATP, NADP, DNA
(4) ATP, ADP, NADP, DNA
✅ (3) AMP, ATP, NADP, DNA
38: If a DNA strand contains 2000 base pairs, how many spirals would occur in each strand?
(1) 200
(2) 2000
(3) 4000
(4) 68000
✅ (1) 200
39: A DNA molecule contains 20,000 base pairs. How many nucleotides would be present in it?
(1) 2000
(2) 40,000
(3) 200,000
(4) 20,000
✅ (2) 40,000
40: In his experiment on the chemistry of DNA, Chargaff estimated the base composition of human sperm and found Adenine constituted 31% and guanine 19%. The quantity of cytosine in the DNA of a human somatic cell is likely to be
(1) 19%
(2) 38%
(3) 31%
(4) 62%
✅ (1) 19%
41: Select the wrong pair:
(1) Insulin: amino acids
(2) Inulin: fructose
(3) RNA: nucleoside
(4) Chitin: N-acetyl glucosamine
✅ (3) RNA: nucleoside
42: Most of the structural proteins which are in the form of fibres exhibit
(1) Primary structure
(2) Secondary structure
(3) Tertiary structure
(4) Quaternary structure
✅ (2) Secondary structure
Topic 3: METABOLITES, METABOLISM
NEET: Previous Years Questions
43: Which of the following are not secondary metabolites in plants? (NEET 2021)
(1) Morphine, codeine
(2) Amino acids, glucose
(3) Vinblastin, curcumin
(4) Rubber, gums
✅ (2) Amino acids, glucose
44: Identify the incorrect pair. (NEET 2021)
(1) Alkaloids – Codeine
(2) Toxin – Abrin
(3) Lectins – Concanavalin A
(4) Drugs – Ricin
✅ (4) Drugs – Ricin
45: Secondary metabolites such as nicotine, strychnine and caffeine are produced by plants for their:
(1) Defence action
(2) Effect on reproduction
(3) Nutritive value
(4) Growth response (NEET 2020)
✅ (1) Defence action
46: Concanavalin A is: (NEET 2019)
(1) an alkaloid
(2) an essential oil
(3) a lectin
(4) a pigment
✅ (3) a lectin
Model Questions
47: Select the group which contains all secondary metabolites.
(1) Anthocyanin, vitamins, glucose, lipids
(2) Morphine, Abrin, Vinblastin, Carotenoids
(3) Glucose, codein, RNA, gums
(4) Curcumin, ricin, amino acids, rubber
✅ (2) Morphine, Abrin, Vinblastin, Carotenoids
48: ATP is
(1) Higher nucleotide
(2) Energy currency
(3) Universal energy carrier
(4) All of these
✅ (4) All of these
49: Which of the following is not a catabolic pathway?
(1) Respiration
(2) Photosynthesis
(3) Glycolysis
(4) Hydrolysis
✅ (2) Photosynthesis
Topic 4: ENZYMES
NEET: Previous Years Questions
50: Regarding catalytic cycle of an enzyme action, select the correct sequential steps: (NEET 2024)
A. Substrate enzyme complex formation.
B. Free enzyme ready to bind with another substrate.
C. Release of products.
D. Chemical bonds of the substrate broken.
E. Substrate binding to active site.
Choose the correct answer from the options given below:
(1) E, A, D, C, B
(2) A, E, B, D, C
(3) B, A, C, D, E
(4) E, D, C, B, A
✅ (1) E, A, D, C, B
51: Inhibition of Succinic dehydrogenase enzyme by malonate is a classical example of: (NEET 2024)
(1) Cofactor inhibition
(2) Feedback inhibition
(3) Competitive inhibition
(4) Enzyme activation
✅ (3) Competitive inhibition
52: The cofactor of the enzyme carboxypeptidase is:
(1) Zinc
(2) Niacin
(3) Flavin
(4) Haem (NEET 2024)
✅ (1) Zinc
53: Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of
(1) Amylase
(2) Lipase
(3) Dinitrogenase
(4) Succinic dehydrogenase (NEET 2023)
✅ (4) Succinic dehydrogenase
54: Given below are two statements: (NEET 2023)
Statement I: Low temperature preserves the enzyme in a temporarily inactive state whereas high temperature destroys enzymatic activity because proteins are denatured by heat.
Statement II: When the inhibitor closely resembles the substrate in its molecular structure and inhibits the activity of the enzyme, it is known as competitive inhibitor.
In the light of the above statements, choose the correct answer from the options given below:
(1) Both Statement I and Statement II are false.
(2) Statement I is true but Statement II is false.
(3) Statement I is false but Statement II is true.
(4) Both Statement I and Statement II are true.
✅ (4) Both Statement I and Statement II are true.
55: Match the following: (NEET 2020)
Choose the correct option from the following:
(a) (b) (c) (d)
(1) (iii) (iv) (i) (ii)
(2) (ii) (iii) (i) (iv)
(3) (ii) (iv) (iii) (i)
(4) (iii) (i) (iv) (ii)
✅ (3) (ii) (iv) (iii) (i)
56: Choose the correct pair from the following:
(1) Nucleases - Separate the two strands of DNA
(2) Exonucleases - Make cuts at specific positions within DNA
(3) Ligases - Join the two DNA molecules
(4) Polymerases - Break the DNA into fragments (NEET 2020)
✅ (3) Ligases - Join the two DNA molecules
57: Consider the following statements:
(A) Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.
(B) A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.
(1) Both (A) and (B) are true.
(2) (A) is true and (B) is false.
(3) Both (A) and (B) are false.
(4) (A) is false and (B) is true. (NEET 2019)
✅ (2) (A) is true and (B) is false.
58: Which of the following statements is correct with reference to enzymes? (NEET 2017)
(1) Holoenzyme = Apoenzyme + Coenzyme
(2) Coenzyme = Apoenzyme + Holoenzyme
(3) Holoenzyme = Coenzyme + Co-factor
(4) Apoenzyme = Holoenzyme + Coenzyme
✅ (1) Holoenzyme = Apoenzyme + Coenzyme
59: A non-proteinaceous enzyme is (NEET-II 2016)
(1) lysozyme
(2) ribozyme
(3) ligase
(4) deoxyribonuclease
✅ (2) ribozyme
60: Which of the following describes the given graph correctly? (NEET-II 2016)
(1) Endothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
(2) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
(3) Endothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
(4) Exothermic reaction with energy A in absence of enzyme and B in presence of enzyme.
✅ (2) Exothermic reaction with energy A in presence of enzyme and B in absence of enzyme.
Model Questions
61: Enzymes are
(1) Globular proteins
(2) Biological catalysts
(3) Highly specific
(4) All the above
✅ (4) All the above
62: Enzymes enhance the rate of a reaction by
(1) Lowering the activation energy of the reaction
(2) Combining with the product as soon as it is formed
(3) Forming a reactant-product complex
(4) Changing the equilibrium point of the reaction
✅ (1) Lowering the activation energy of the reaction
63: Which of the following is the best evidence for the lock and key theory of enzyme action?
(1) Compounds similar in structure to the substrate inhibit the reaction
(2) Enzymes are found in living organisms and speed up certain reactions
(3) Enzymes determine the direction of a reaction
(4) Enzymes have optimum temperature and pH
✅ (1) Compounds similar in structure to the substrate inhibit the reaction
64: An example of competitive inhibition of an enzyme is the inhibition of
(1) Cytochrome oxidase by cyanide
(2) Succinic dehydrogenase by malonic acid
(3) Hexokinase by glucose-6-phosphate
(4) Carbonic anhydrase by CO2
✅ (2) Succinic dehydrogenase by malonic acid
65: With reference to enzymes, which one of the following statements is true?
(1) Apoenzyme = Holoenzyme + Coenzyme
(2) Coenzyme = Apoenzyme + Holoenzyme
(3) Holoenzyme = Coenzyme – Apoenzyme
(4) Holoenzyme = Apoenzyme + Coenzyme
✅ (4) Holoenzyme = Apoenzyme + Coenzyme
66: The enzyme that joins together molecules by forming new covalent bonds are
(1) Oxidoreductases
(2) Transferases
(3) Lyases
(4) Ligases
✅ (4) Ligases
67: Protein portion of the enzyme is known as
(1) Co-factor
(2) Holoenzyme
(3) Apoenzyme
(4) Prosthetic group
✅ (3) Apoenzyme