Biomolecules Exam Questions Class 11 Biology

Please see Chapter 9 Biomolecules Exam Questions Class 11 Biology below. These important questions with solutions have been prepared based on the latest examination guidelines and syllabus issued by CBSE, NCERT, and KVS. We have provided Class 11 Biology Exam Questions and answers for all chapters in your NCERT Book for Class 11 Biology. These solved problems for Biomolecules in Class 11 Biology will help you to score more marks in upcoming examinations.

Exam Questions Chapter 9 Biomolecules Class 11 Biology

Objective Questions

Question. Inulin is a polymer of
(a) glucose
(b) galactose
(c) fructose
(d) arabinose

Question. Most abundant protein in human body is
(a) collagen
(b) myosin
(c) actin
(d) albumin

Question. The bond between phosphate and hydroxyl group of sugar in nucleic acid is _______.
(a) glycosidic bond
(b) peptide bond
(c) ester bond
(d) none of these

Question. The Km value of the enzyme is the value of the substrate concentration at which the reaction reaches to
(a) zero
(b) 2 Vmax
(c) ½ Vmax
(d) ¼ Vmax

Question. Feedback inhibition of enzymes is affected by
(a) enzyme
(b) substrate
(c) end product
(d) intermediate end products

Question. Which one of the following statements is correct, with reference to enzymes ?
(a) Holoenzyme = Apoenzyme + Coenzyme
(b) Coenzyme = Apoenzyme + Holoenzyme
(c) Holoenzyme = Coenzyme + Co-factor
(d) Apoenzyme = Holoenzyme + Coenzyme

Statement Type Questions

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. 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. 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. 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

Assertion/Reason Type Questions

In the following questions, a statement of Assertion is followed by a statement of Reason.
(a) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
(b) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
(c) If Assertion is true but Reason is false.
(d) If both Assertion and Reason are false.

Question. Assertion: Glycosidic bonds are formed by dehydration.
Reason: In polysaccharides, individual monosaccharide is linked by glycosidic bond.

Question. Assertion : Unsaturated fats are more reactive compared with the saturated fats.
Reason : Unsaturated fats have only single bonds in their structure.

Question. Assertion: The amino acid glycine comes under the category of nonessential amino acids.
Reason: This is due to the fact that it can not be synthesised in the body.

Matching Type Questions

Question. Which one of the following is wrongly matched?
(a) Fungi – Chitin
(b) Phospholipid – Plasma membrane
(c) Enzyme – Lipopolysaccharide
(d) ATP – Nucleotide derivative

Question. Choose the mismatch pair
(a) Glutamic acid – Acidic
(b) Lysine – Basic
(c) Valine – Charged
(d) Phenylalanine – Aromatic

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.

Critical Thinking Type Questions

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. A nucleoside differs from nucleotide is not having
(a) sugar
(b) nitrogen
(c) phosphate
(d) phosphate and sugar

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. 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. When triglycerides are solid at ordinary room temperature, they are called
(a) oils
(b) gases
(c) fats
(d) none of these

Question. Enzyme that break nucleic acids into nucleotides belongs to which of the following class ?
(a) Oxidoreductases
(b) Transferases
(c) Hydrolases
(d) Lyases

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. 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. 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.