Please refer to MCQ Questions Chapter 9 Biomolecules Class 11 Biology with answers provided below. These multiple-choice questions have been developed based on the latest NCERT book for class 11 Biology issued for the current academic year. We have provided MCQ Questions for Class 11 Biology for all chapters on our website. Students should learn the objective based questions for Chapter 9 Biomolecules in Class 11 Biology provided below to get more marks in exams.
Chapter 9 Biomolecules MCQ Questions
Please refer to the following Chapter 9 Biomolecules MCQ Questions Class 11 Biology with solutions for all important topics in the chapter.
MCQ Questions Answers for Chapter 9 Biomolecules Class 11 Biology
Question- Which statement is incorrect about coenzyme ?
(a) Every coenzyme is a cofactor and every cofactor is a coenzyme.
(b) Every coenzyme is a cofactor and every cofactor is not a coenzyme.
(c) Most of the coenzymes are nucleotides and are composed of vitamins.
(d) Coenzymes are the active constituents of enzyme.
Question- What will happen when the cofactor is removed from the enzyme?
(a) Catalytic activity of the enzyme is lost.
(b) Enzyme preserves in a temporarily inactive state.
(c) The substurate molecules are not closely related to enzymes molecules.
(d) Both b and c
Question- Which of the following statements are correct?
(i) Chitin, a complex or heteropolysaccharide occuring in exoskeleton consists of NAG.
(ii) Glucosamine and N-acetyl glucosamine are modified sugar.
(iii) Cellulose shows blue colour when treated with I2.
(iv) Starch in plants and glycogen in animals are store houses of energy.
(v) Right end of polysaccharide is called reducing end while left end is called non-reducing end.
(a) (i), (ii) and (iii)
(b) (iii), (iv) and (v)
(c) All except (iii)
(d) All except (v)
Question- Km is related to
(b) ES complex
(d) none of these
Question- Which of the given option is correct for the following statements ?
(i) The metabolic pathway in which acetic acid is converted into cholesterol is an endothermic one.
(ii) Anabolic pathway is endergonic while catabolic pathway is exergonic.
(iii) Without metabolism there can not be a living state.
(a) All are correct
(b) All are wrong
(c) (i) and (ii) are correct
(d) Only (iii) is correct
Question- Which of the following is not an attribute of enzymes ?
(a) They are substrate specific in nature.
(b) They are proteinaceous in nature.
(c) They are used up in the reaction.
(d) They speed up rate of biochemical reaction.
Question- Match column I (organic compound) with column II (examples) and choose the correct combination from the given options.
(Organic Compounds) (Examples)
A. Fatty acid I. Glutamic acid
B. Phospholipid II. Tryptophan
C. Aromatic amino acid III. Lecithin
D. Acidic amino acid IV. Palmitic acid
(a) A – I; B – II; C – III, D – IV
(b) A – IV; B – III; C – II, D – I
(c) A – II; B – III; C – IV, D – I
(d) A – III; B – IV; C – I, D – II
Question- Which of the following is wrongly matched ?
(a) Ribozyme – Proteinaceous in nature.
(b) Apoenzyme – The protein part of enzyme.
(c) Co-enzyme – Loosely attached organic cofactor of haloenzyme
(d) Co-factors – Non-protein part of haloenzyme.
Question- Match the protein given in column I with its function given in column II and choose the right option.
Column I Column II
A. Collagen I. Glucose transport
B. Trypsin II. Hormone
C. Insulin III. Intercellular ground substance
D. GLUT-4 IV. Enzyme
(a) A – III; B – IV; C – II; D – I
(b) A – IV; B – I; C – II; D – III
(c) A – II; B – IV; C – I; D – III
(d) A – III; B – IV; C – I; D – II
Question- On hydrolysis, a nucleoside would not yield
(c) pentose sugar
(d) phosphoric acid
Question- Transition state structure of the substrate formed during an enzymatic reaction is.
(a) permanent but unstable.
(b) transient and unstable.
(c) permanent and stable.
(d) transient but stable.
Question- Match column I (category) with column II (secondary metabolites)and choose the correct option.
Column I Column II
(Category) (Secondary metabolites)
A. Pigments I. Concanavalin A
B. Terpenoides II. Monoterpenes, Diterpenes
C. Alkaloids III. Morphine, Cadeine
D. Lectins IV. Carotenoids, Anthocyanin
(a) A – IV; B – II; C – III; D – I
(b) A – IV; B – III; C – II; D – I
(c) A – I; B – IV; C – III; D – II
(d) A – I; B – III; C – II; D – IV
Question- According to weight percentage, the first three elements in human body are
(a) C > H > O
(b) C > O > N
(c) O > N > C
(d) O > C > H
Question-Choose the mismatch pair
(a) Glutamic acid – Acidic
(b) Lysine – Basic
(c) Valine – Charged
(d) Phenylalanine – Aromatic
Question- Which of the following statement(s) is/are incorrect?
(i) Nearly 1/3rd of all enzymes requires the presence of metal ions for catalytic function.
(ii) Metal ions form coordinate bond with side chain at active site of metalloenzyme and at the same time form one or more coordinate bonds with the substrate.
(iii) NAD and NAD (coenzymes) contain niacin (vit.B3)
(iv) Coenzymes are organic compounds but their association with the apoenzyme is only transient, usually occurring during catalysis.
(a) All of these
(b) Only (iii) and (iv)
(c) Only (iv)
(d) None of these
Question- Nucleotides are building blocks of nucleic acids. Each nucleotide is a composite molecule formed by
Question- Relation between amino acid and protein is similar to the one found between
(a) glucose and fructose
(b) thymine and uracil
(c) nucleosides and nucleic acid
(d) nucleotides and nucleic acid
Question- Primary structure of polypeptide is stabilized or secondary structure of polypeptide is maintained by
(a) disulphide bonds.
(b) ionic bonds.
(c) hydrogen bonds.
(d) hydrophobic interactions.
Question- Antiparallel strands of a DNA molecule means that
(a) the phosphate groups of two DNA strands, at their ends share the same position.
(b) the phosphate groups at the start of two DNA strands are in opposite position (pole).
(c) one strand turns clockwise.
(d) one strand turns anti-clockwise.
Question- The steps in catalytic cycle of an enzyme action are given in random order.
(i) The enzyme releases the products. Now enzyme is free to bind another substrate.
(ii) The active sites, now in close proximity of substrate breaks the bond of substrate and forms E-P complex.
(iii) Binding of substrate induces the enzyme to alter its shape fitting more tightly around the substrate.
(iv) The substrate binds to the active site of enzyme (i.e., fitting into the active site).
The correct order is
(a) (i), (ii), (iii), (iv)
(b) (iv), (iii), (ii), (i)
(c) (i), (iii), (ii), (iv)
(d) (i), (ii), (iv), (iii)
Question- “All enzymes are proteins.” This statement is now modified because an apparent exception to this biological truth is
Question- Carbohydrates, the most abundant biomolecule on earth, are produced by
(a) some bacteria, algae and green plant cells.
(b) fungi, algae and green plant cells.
(c) all bacteria, fungi and algae.
(d) viruses, fungi and bacteria.
Question- The quaternary structure of human haemoglobin is best described as a
(a) dimer of identical subunits.
(b) dimer of different subunits.
(c) tetramer of four different subunits.
(d) tetramer of two different subunits.
Question- Study the given statements and select the correct option.
(i) Nitrogen bases are open chain hydrocarbons.
(ii) A nucleoside differ from nucleotide in not having phosphate.
(iii) One turn of B-DNA has ten base pairs.
(iv) Length of one turn of DNA is 3.4 Å.
(a) Statements (i) and (ii) are correct.
(b) Statements (i) and (iv) are correct.
(c) Statements (ii) and (iii) are incorrect.
(d) Statements (i) and (iv) are incorrect.
Question- Which of the following set is correctly match to the category mentioned against them ?
(a) Lysine, glycine, thiamine – amino acids.
(b) Arachidonic acid, acetic acid, palmitic acid – Fatty acids
(c) Thymidine, uridine, cytidilic acid – Nucleosides
(d) Cellulose, inulin, glycogen – Polysaccharides
Question- The stored form of sugar in animal is a
Question- If all the peptide bonds of a protein are broken down,then what would remain?
(a) Amino acids
Question- For a protein to have a quaternary structure, it must
(a) have four amino acids.
(b) consist of two or more polypeptide subunits.
(c) consist of four polypeptide subunits.
(d) have at least four disulphide bridges.
Question- Enzyme that break nucleic acids into nucleotides belongs to which of the following class ?
Question- At temperature near freezing point, the enzymes are
(c) slightly activated
(d) slightly inactivated
Question- Select false statements for an enzyme promoting a chemical reaction by
(i) lowering the energy of activation.
(ii) causing the release of heat, which acts as a primer.
(iii) increasing molecular motion.
(iv) changing the free energy difference between substrate and product.
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (ii), (iii) and (iv)
(d) (iii) and (iv)
Question- Match the column-I (component) with column-II (% of the total cellular mass) and identify the correct option.
(Component) (% of the total cellular mass)
A. Water I. 3
B. Proteins II. 70-90
C. Carbohydrates III. 2
D. Lipids IV. 5-7
E. Nucleic acids V. 10-15
(a) A – V; B – II; C – III; D – IV; E – I
(b) A – II; B – V; C – I; D – III; E – IV
(c) A – III; B – I; C – IV; D – V; E – II
(d) A – V; B – IV; C – III; D – II; E – I
Question- Sugar-phosphate backbone in nucleic acid
(a) is hydrophilic in nature.
(b) is negatively charged.
(c) shows polarity.
(d) all of the above.
Question- Which one of the following biomolecules is correctly characterized?
(a) Lecithin – A phosphorylated glyceride found in cell membrane.
(b) Palmitic acid – An unsaturated fatty acid with 18 carbon atoms.
(c) Adenylic acid – Adenosine with a glucose phosphate molecule.
(d) Alanine amino acid – Contains an amino group and an acidic group anywhere in the molecule.
Question- The information in a genetic nucleic acid resides in the
(a) number of nucleotides.
(b) kinds of nucleotides.
(c) sequence of nucleotides.
(d) all of the above.
Question- Match the biomoecules given in column I with their examples given in column II and choose the correct answer.
Column I Column II
A. Carbohydrates I. Trypsin
B. Protein II. Cholesterol
C. Nucleic acid III. Insulin
D. Lipid IV. Adenylic acid
(a) A – III; B – I; C – IV, D – II
(b) A – II; B – III; C – IV, D – I
(c) A – III; B – IV; C – I, D – II
(d) A – IV; B – I; C – II, D – III
Question- When triglycerides are solid at ordinary room temperature, they are called
(d) none of these
Question- Hexokinase (Glucose + ATP → Glucose 6-P + ADP) belongs to the category
Question- Mark the odd pair in the followings
(a) Amino acid – Protein
(b) Nucleotide – DNA
(c) Glycerol – Fatty acid
(d) Monosaccharide – Cellulose
Question- Enzymes are sensitive to
(d) both (b) and (c)
Question- The catalytic efficiency of two different enzymes can be compared by the
(a) Km value.
(b) pH optimum value.
(c) formation of the product.
(d) molecular size of the enzyme.
Question- Which of the following statements about enzymes is incorrect?
(a) Enzymes are denatured at high temperature but in certain exceptional organisms. They are effective even at 80° – 90°C.
(b) Enzymes require optimum pH for maximal activity.
(c) Most enzymes are proteins but some are lipids.
(d) Enzymes are highly specific.
Question- “When glucose is degraded to lactic acid in skeletal muscles energy is liberated”.
Which of the following conclusion is correctly associated with the above statement? enzyme?
(a) It is a catabolic pathway which releases energy.
(b) It is an anabolic pathway which releases energy.
(c) The energy, liberated during this degradation, is trapped and stored in the form of chemical bonds (ADP).
(d) None of the above.
Question- Find out the wrongly matched pair
(a) Primary metabolite – Ribose
(b) Secondary metabolite – Anthocyanins
(c) Chitin – Polysaccharide
(d) Cellulose – Heteropolymer
Question- Match column I with column II and choose the correct option.
A. Cotton fibre I. Chitin
B. Exoskeleton of II. Glycogen
C. Liver III. Starch
D. Peeled potato IV. Cellulose
(a) A – I; B – IV; C – III; D – II
(b) A – IV; B – I; C – II; D – III
(c) A – IV; B – I; C – III; D – II
(d) A – I; B – IV; C – II; D – III
Question- Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it ?
(a) Adenine, thymine – Purines
(b) Thymine, uracil – Pyrimidines
(c) Uracil, cytosine – Pyrimidines
(d) Guanine, adenine – Purines
Question- Why the velocity of enzymatic reaction is not exceeded by any further rise in the concentration of the substrate?
(a) The enzyme molecules are equal to the substrate molecules.
(b) The enzyme molecules are fewer than the substrate molecules
(c) The substrate molecules are not closely resembled to the enzyme molecules.
(d) Both b and c.
Question- Natural lipids are readily soluble in
(d) none of these
Question- Which one of the following is wrongly matched?
(a) Fungi – Chitin
(b) Phospholipid – Plasma membrane
(c) Enzyme – Lipopolysaccharide
(d) ATP – Nucleotide derivative
Question- The effectiveness of an enzyme is affected least by
(b) concentration of the substrate.
(c) original activation energy of the system.
(d) concentration of the enzyme.
Question- Find out the odd one from the given pair.
(a) Polysaccharide – Glycosidic bond
(b) Protein – Peptide bond
(c) Fat – Ester
(d) Polynucleotide – Hydrogen bond
Question- In the composition of cellular mass, arrange the components- proteins(P), carbohydrates(C), lipids(L) and nucleic acids(N) in decreasing order of mass percentage.
(a) C > N > P > L
(b) P > N > C > L
(c) P > C > L > N
(d) P > N > L > C
Question- Find out the correct match.
(a) Inulin – Polymer of glucose
(b) Starch – Spiral secondary structure
(c) Cellulose – Component of cell wall
(d) Glycogen – Monosaccharide and reserved food of plants
Question- A nucleoside differs from nucleotide is not having
(d) phosphate and sugar
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