Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
1. Which of the following are not polymeric?
1. Protiens
2. Polysaccharides
3. Lipids
4. Nucleic acids
2. A non-proteinaceous enzyme is
1. lysozyme
2. ribozyme
3. ligase
4. deoxyribonuclease
3.
Which of the following describes the given graph
correctly?
6.
Water soluble pigments found in plant cell vacuoles are
1. cholrophylls
2. carotenoids
3. anthocyanins
4. xanthophylls
7. The chitinous exoskeleton of arthropods is formed by
the polymerization of
1. Keratine sulphate and chondroitin sulphate
2. D-glucosamine
3. N-acetyl glucosamine
4. Lipoglycans
8. Which of the following biomolecules have a
phosphodiester bond?
1. Fatty acids in a diglyceride
2. Monosaccharides in a polysaccharide
3. Amino acids in a plypeptide
4. Nucleic acids in a nucleoide
9.
A phosphoglyceride is always made up of
1. only an 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
glycerol molecule to which a phosphate group is also
attached.
3. a saturated or unsaturated fatty acid esterified to a
1. Endothermic reaction with energy A in the presence of phosphate group which is also
enzyme and B in the absence of enzyme
attached to a glycerol molecule.
2. Exothermic reaction with energy A in the presence of 4. only a saturated fatty acid esterified to a glycerol
enzyme and B in the absence of enzyme
molecule to which a phosphate group is also attached.
3. Endothermic reaction with energy A in the absence of
enzyme and B in the presence of enzyme
4. Exothermic reaction with energy A in the absence of 10. Select the option which is not correct with respect to
enzyme and B in the presence of enzyme
enzyme action:
4.
Which one of the following statements is wrong?
1. Cellulose is a polysaccharide
2. Uracil is a pyrimidine
3. Glycine is a sulphur containing amino acid
4. Sucrose is a disaccharide
5.
A typical fat molecule is made up of
1. One glycerol and three fatty acid molecules
2. One glycerol and one fatty acid molecule
3. Three glycerol and three fatty acid molecules
4. Three glycerol molecules and one fatty acid molecule.
1. Substrate binds with enzyme at its active site.
2. Addition of lot of succinate does not reverse the
inhibition of succinic dehydrogenase by malonate
3. A non-competitive inhibitor binds the enzyme at a site
distinct from that which binds the substrate
4. malonate is a competitive inhibitor of succinic
dehydrogenase
11. The essential chemical components of many
coenzymes are:
1. Nucleic acid
2. Carbohydrates
3. Vitamins
4. Proteins
Page: 1
Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
12. Transition state structure of the substrate formed 15. Which one of the following structural formulae of two
during an enzymatic reaction is:
organic compounds are correctly identified along with its
1. Permanent but unstable
related function?
2. transeint and unstable
3. permanent and stable
4. transeint but stable
13. Given below is the diagrammatic representation of one
of the categories of small molecular weight organic
compounds in the living tissues. Identify the category
shown and the one blank component X in it
1. Cholesterol Guanin
2. Amino acid NH2
3. Nucleotide Adenine
4. Nucleoside Uracil
14. Which one is the most abundant protein in the animal 1. A- Triglyceride – sources of energy e-major
world?
2. B- Uracil – a component of DNA
1. Trypsin
3. A- Lecithin – a component of cell membrane
2. Haemoglobin
4. B- Adenine – a nucleotide that makes up nucleic acids
3. Collagen
4. Insulin
Page: 2
Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
16. The curve given below shows enzymatic activity with
relation to three conditions (pH, temperature and substrate
concentration) what do the two axises (X and Y)
represent?
X - axis
(a) Temperature
Y-axis
Enzyme activity
(b) Substrate concentration
Enzymatic activity
(c) Enzymatic activity
Temperature
(d) Enzymatic activity
pH
1.
2.
3.
4.
(a)
(b)
(c)
(d)
19. Consider the following statements:
(A) Coenzyme or metal ion that is tightly bound to
enzyme protein is called prosthetic group
(B) A complete catalytic enzyme with its bound prosthetic
group is called apoenzyme
Select the correct option
1. (A) is false but (B) is true
2. Both (A) and (B) are true
3. (A) is true but (B) is false
4. Both (A) and (B) are false
20. Which of the following organic compounds is the
main constituent of Lecithin?
1. Arachidonic acid
2. Phospholipid
3. Cholesterol
4. Phosphoprotein
21. Prosthetic groups differ from co-enzymes in that
1. they require metal ions for their activity
2. they (prosthetic groups) are tightly bound to
apoenzymes.
3. their association with apoenzymes is transient.
4. they can serve as co-factors in a number of enzymecatalyzed reactions.
22. "Ramachandran plot" is used to confirm the structure
of
1. RNA
2. Proteins
3. Triacylglycerides
4. DNA
17.
A competitive inhibitor of succinic dehydrogenase is
1. malonate
2. Oxaloacetate
3. α-ketoglutarate
4. malate
18. An organic substance bound to an enzyme and
essential for its activity is called:
1. coenzyme
2. holoenzyme
3. apoenzyme
4. isoemzyme
Page: 3
Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
23. Match the following:
(a)
Inhibitor of catalytic
activity
(i)
Ricin
(b)
Possess peptide bonds
(ii)
Malonate
(c)
Cell wall material in fungi (iii)
Chitin
(d)
Secondary metabolite
Collagen
(iv)
Choose the correct option from the following:
(1)
(a)
(b)
(c)
(d)
(iii)
(i)
(iv)
(ii)
(2)
(iii)
(iv)
(i)
(ii)
(3)
(ii)
(iii)
(i)
(iv)
(4)
(ii)
(iv)
(iii)
(i)
27. Match the following :
(a) Aquaporin (i) Amide
(b) Asparagine (ii) Polysaccharide
(c) Abscisic acid (iii) Polypeptide
(d) Chitin (iv) Carotenoids
Select the correct option :
1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
2. (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)
3. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
4. (a)-(iii), (b)-(i), (c) -(ii), (d)-(iv)
28. Which one of the following biomolecules is correctly
characterised ?
1. Palmitic acid - an unsaturated fatty acid with 18 carbon
atoms
2. Adenylic acid - adenosine with a glucose phosphate
molecule
3. Alanine amino acid - Contains an amino group and an
acidic group anywhere in the molecule
4. Lecithin - a phosphorylated glyceride found in cell
membrane
29. For its activity, carboxypeptidase requires :
1. Iron
2. Niacin
3. Copper
4. Zinc
24. Identify the basic amino acid from the following.
1. Glutamic Acid
2. Lysine
3. Valine
4. Tyrosine
25. Which one of the following is the most abundant
protein in the animals?
(1) Collagen
(2) Lectin
(3) Insulin
(4) Hemoglobin
26. Identify the statement which is incorrect.
1. Sulphur is an integral part of cysteine.
2. Glycine is an example of lipids.
3. Lecithin contains a phosphorus atom in its structure.
4. Tyrosine possesses an aromatic ring in its structure.
Page: 4
Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
30. The figure given below shows the conversions of a
substrate into product by an enzyme. In which one of the
four options (1-4) the components of reaction labelled as
A, B, C and D are identified correctly –
33. Which of the following statements regarding enzyme
inhibition is correct 1. Competitive inhibition is seen when a substrate
competes with an enzyme for binding to an inhibitor
protein
2. Non-competitive inhibitors often bind to the enzyme
irreversibly
3. Competitive inhibition is seen when the substrate and
the inhibitor compete for the active site on the enzyme
4. Non-competitive inhibition of an enzyme can be
overcome by adding large amounts of substrate
Options
A
34. Nucleotides are building blocks of nucleic acids. Each
nucleotide is a composite molecule formed by 1. Base-sugar-OH
2. Base-sugar-phosphate
3. Sugar-phosphate
4. (Base-sugar-phosphate)n
B
1.
Transition
state
Potential
energy
2.
Potential
energy
Transition
state
3.
Activation
Transition
energy with
state
enzyme
4.
Potential
energy
Transition
state
C
Activation
energy
without
enzyme
D
Activation
energy with
enzyme
Activation
Activation
energy
energy with
without
enzyme
enzyme
Activation
energy
Potential
without
energy
enzyme
Activation
Activation
energy
energy with
without
enzyme
enzyme
35. Which protein is found in maximum amount:
1. Catalase
2. Zinc carbonic anhydrase
3. Transferase
4. RUBISCO
36. ATP is :
1. Nucleotide
2. Nucleoside
3. Nucleic acid
4. Vitamin
37. Role of enzyme in reactions is to
31. Three of the following statements about enzymes are 1. Decrease activation energy
2. Increase activation energy
correct and one is wrong. Which
3. Act as inorganic catalyst
one is wrong
1. Enzymes are denatured at high temperature but in 4. None of the above
certain exceptional organisms they are effective even at
38. Phospholipids are esters of glycerol with :temperatures 80º - 90ºC
(1) Three carboxylic acid residues
2. Enzymes are highly specific
(2) Two carboxylic acid residues and one phosphate group
3. Most enzymes are proteins but some are lipids
(3) One carboxylic acid residue and two phosphate groups
4. Enzymes require optimum pH for maximal activity
(4) Three phosphate groups
32. Which of the following is the simplest amino acid (1) Alanine
(2) Asparagine
(3) Glycine
(4) Tyrosine
39. The major portion of the dry weight of plants
comprises of : (1) Nitrogen, phosphorus and potassium
(2) Calcium, magnesium and sulphur
(3) Carbon, nitrogen and hydrogen
(4) Carbon, hydrogen and oxygen
40. Which of the following are not secondary metabolites
in plants?
(1) Vinblastin, curcumin
(2) Rubber, gums
(3) Morphine, codeine
(4) Amino acids, glucose
Page: 5
Biomolecules - NCERT based PYQs
Contact Number: 9667591930 / 8527521718
41. Match List -I with List - II.
List-I
List-Ii
(a) Protein
I. C-C double bonds
(b) Unsaturated fatty acid II. Phosphodiester bonds
(c) Nucleic acid
III. Glycosidic bonds
(d)Polysaccharides
IV. Peptide bonds
Choose the correct answer from the options given below.
(a) (b) (c) (d)
1. (ii) (i) (iv) (iii)
2. (iv) (iii) (i) (ii)
3. (iv) (i) (ii) (iii)
4. (i) (iv) (iii) (ii)
42. Identify the incorrect pair.
(1) Lectins - Concanavalin A
(2) Drugs - Ricin
(3) Alkaloids - Codeine
(4) Toxin - Abrin
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43. Following are the statements with reference to 'lipids'.
(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 carbon atoms including carboxyl
carbon.
(e) Arachidonic acid has 16 carbon atoms.
Choose the correct answer from the options given below.
1. (b) and (c) only
2. (b) and (e) only
3. (a) and (b) only
4. (c) and (d) only
Page: 6