Biomolecules Class 12 MCQ. We covered all the Biomolecules Class 12 MCQ in this post for free so that you can practice well for the exam.
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Biomolecules Class 12 MCQ for Students
Which of the following is an INCORRECT match?
(A) Alkaloid – Ricin
(B) Lectin – Concanavalin A
(C) Drugs – Vinblastin
(D) Toxin – Abrin
Option a – Alkaloid – Ricin
……. is NOT a kind of a co-factor.
(A) Prosthetic group
(B) Ribozyme
(C) Metal ion
(D) Co-enzyme
Option b – Ribozyme
Study the given statements and select the correct option. Statement I: Metabolites exist in steady-state biological systems. Statement II: The living state is a non-equilibrium steady state.
(A) Statement I is correct and statement II is incorrect.
(B) Statement II is correct and statement I is incorrect.
(C) Both statement I and statement II are correct.
(D) Both statement I and statement II are incorrect.
Option c – Both statement I and statement II are correct.
Which of the following is/are the reasons for declining enzyme activity?
(A) Extremely low temperatures
(B) pH below optimum pH
(C) Formation of ES complex
(D) Both (A) and (B)
Option d – Both (A) and (B)
…….. transports glucose across the cell membrane.
(A) Glutamine
(B) GLUT-4
(C) Amylase
(D) Trypsin
Option b – GLUT-4
From the following which is NOT a function of polysaccharides?
(A) Structural component of cell walls
(B) Component of arthropod exoskeleton
(C) Absorption of vitamins
(D) Store house of energy
Option c – Absorption of vitamins
Which of the following is an incorrectly matched pair?
(A) Uracil : Pyrimidine
(B) l’deoxyribose : DNA
(C) Monosaccharide pentose : RNA
(D) Adenine : Purine
Option b – l’deoxyribose : DNA
Complete the analogy. Protein: Peptide bond: Polysaccharide …….
(A) Covalent bond
(B) Glycosidic bond
(C) Ester bond
(D) lonic bond
Option b – Glycosidic bond
Which of the following statement is INCORRECT regarding the similarities between DNA and RNA?
(A) Both have pentose sugar.
(B) Both have phosphodiester bonds.
(C) Both are double-stranded structures in prokaryotes.
(D) Both have the same set of purines.
Option c – Both are double-stranded structures in prokaryotes
Identify the INCORRECT statement regarding enzyme catalysis.
(A) Enzymes are three-dimensional structures with an ‘active site’ which has a cleft for binding of substrate.
(B) The substrate alters its shape to ensure the binding of the enzyme.
(C) On releasing the products, the free enzyme binds to another molecule of substrate.
(D) ‘ES’ complex is transient and thus dissociates into products (P) and unchanged enzyme with an intermediate of ‘EP’ complex.
Option b – The substrate alters its shape to ensure the binding of the enzyme.
Identify the CORRECT statements about secondary metabolites. i. Secondary metabolites are useful to human welfare. ii. The functions of all the secondary metabolites in organisms are well known. iii. Secondary metabolites are exclusively found in animal cells. iv. Secondary metabolites have ecological importance.
(A) ii and iii
(B) ii and iv
(C) i and iv
(D) i and iii
Option c – i and iv
Identify the phospholipid found in the cell membrane.
(A) Cytidine
(B) Lecithin
(C) Cholesterol
(D) Collagen
Option b – Lecithin
Which of the following statement INCORRECT regarding is
(A) co-enzymes? The essential chemical components of many co-enzymes are vitamins.
(B) Co-enzymes are a kind of co-factor.
(C) Co-enzymes are organic compounds like NAD and NADP
(D) Co-enzymes are tightly bound to the apoenzyme.
Option d – Co-enzymes are tightly bound to the apoenzyme.
From the following identify the essential chemical components of many coenzymes.
(A) Organic compounds
(B) Vitamins
(C) Apoenzymes
(D) Minerals
Option b – Vitamins
For which of the following purpose the chemical analysis of living tissues using Cl, CCOOH is carried out?
(A) To analyze the type of RNA present in the tissue sample
(B) To analyze the type of organic compounds present in it
(C) To analyze the dry weight of the tissue sample
(D) To find the molecular formula of compounds in the tissue sample
Option b – To analyze the type of organic compounds present in it
Which of the following inhibits the enzyme activity of dehydrogenase due to competitive inhibition?
(A) Malonate
(B) Fumarate
(C) Citrate
(D) Succinate
Option a – Malonate
Study the given statements and select the correct option. Statement I: Non-essential amino acids are not produced in the body. Statement II: Essential amino acids are produced in the body.
(A) Statement I is correct and statement II is incorrect.
(B) Statement II is correct and statement I is incorrect.
(C) Both statement I and statement II are correct.
(D) Both statements are incorrect.
Option d – Both statements are incorrect.
Which of the following is NOT a structural polysaccharide?
(A) Pectin
(B) Chitin
(C) Cellulose
(D) Glycogen
Option d – Glycogen
From the following identify the CORRECT match.
(A) Arachidonic acid -21 carbon atoms.
(B) Saturated fatty acids – With one or more C=C double bonds.
(C) Palmitic acid – 16 carbon atoms.
(D) Unsaturated fatty acid without a C=C double bond.
Option c – Palmitic acid – 16 carbon atoms.
The age of the plant can be determined by the number of
(A) annual rings
(B) vascular bundles
(C) branches
(D) medullary rays
Option a – annual rings
Which of the following is/are factor/s responsible for seed dormancy?
(A) Hard seed coat
(B) Seed coats impermeable to water
(C) Presence of immature embryo
(D) All of these
Option d – All of these
The micronutrient causing delayed flowing is
(A) N
(B) S
(C) P
(D) Mo
Option d – Mo
Phellogen, Phellem, and Phelloderm are collectively called as
(A) Secondary stele
(B) Annual rings
(C) Pericycle
(D) Periderm
Option d – Periderm
A plant is exposed to 8 hours of light and 16 hours of uninterrupted darkness for a considerable amount of days. If the plant starts flowering after this treatment, then what type of plant is it?
(A) Day-neutral plant
(B) Short-day plant
(C) Long-day plant
(D) None of the above
Option b – Short-day plant
Raisins when placed in water, swell due to
(A) facilitated diffusion
(B) plasmolysis
(C) imbibition
(D) transpiration
Option c – imbibition
In T.S. of a dicot root, the tangential, as well as radial walls of the endodermal cells, have a deposition of waxy material in the form of
(A) conjunctive tissue
(B) companion cells
(C) Casparian strip
(D) cork cambium
Option c – Casparian strip
Select the INCORRECT statement/s from the following.
(A) Ground tissue consists of simple tissues like parenchyma, sclerenchyma, and collenchyma.
(B) In leaves, the ground tissue consists of thin-walled chloroplast-containing cells.
(C) All tissues including the epidermis and vascular bundles constitute the ground tissue.
(D) Both (A) and (C)
Option c – All tissues including the epidermis and vascular bundles constitute the ground tissue.
Which of the following factor is required to induce flowering by the process of vernalization?
(A) Exposure to low temperature
(B) Exposure to high temperature
(C) prolonged photoperiod
(D) short photoperiod
Option a – Exposure to low temperature
Necrosis refers to
(A) delay in flowering
(B) loss of chlorophyll
(C) death of tissue
(D) inhibition of cell division
Option c – death of tissue
Assertion: ABA plays an important role in dormancy. Reason: ABA helps seeds to withstand desiccation and other factors unfavorable for growth by inducing dormancy.
(A) Both assertion and reason are true and the reason is the correct explanation of assertion.
(B) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(C) The assertion is true but the reason is false.
(D) Both assertion and reason are false.
Option a – Both assertion and reason are true and the reason is the correct explanation of assertion.
What will be the value for osmotic pressure, if the osmotic potential of a system is -120 kPa?
(A) – 100 kPa
(B) + 120 kPa
(C) – 60 kPa
(D) + 12 kPa
Option b – + 120 kPa
Select the INCORRECT statement from the following.
(A) The walls of the collenchyma show deposition of cellulose, hemicellulose, and pectin.
(B) The cells of sclerenchyma are thin-walled and contain protoplast.
(C) The walls of parenchyma cells are thin and made up of cellulose.
(D) Collenchyma cells assimilate food when they contain chloroplast.
Option b – The cells of sclerenchyma are thin-walled and contain protoplast.
…….. is responsible for the primary growth of the plant.
(A) Apical meristem
(B) Cork cambium
(C) Vascular cambium
(D) Both (B) and (C)
Option a – Apical meristem
Read the given statements and select the correct option. Statement I: Mineral concentration which reduces the dry weight of tissue by about 10% is considered toxic. Statement II: Moderate decrease in the number of micronutrients causes toxicity in plants. The correct statement/s is/are
(A) Statement I
(B) Statement II
(C) Both statements I and III
(D) Neither statements I and III
Option a – Statement I
Xylem elements include all the given below, except
(A) Tracheids and vessels
(B) Xylem fibres
(C) Xylem parenchyma
(D) Companion cells.
Option d – Companion cells
Apical dominance induced by auxin is counteracted by
(A) Ethylene
(B) Cytokinin
(C) Abscisic acid
(D) Gibberellic acid
Option b – Cytokinin
Which of the following is an element of the xylem?
(A) Companion cells
(B) Tracheids
(C) Sieve tube elements
(D) Bast fibres
Option b – Tracheids
Pruning of tea plants is done to remove
(A) heterophylly
(B) apical dominance
(C) pest
(D) wilting of leaves
Option b – apical dominance
……. ATP molecules are required for the synthesis of one molecule of ammonia by nitrogenase.
(A) 4
(B) 8
(C) 10
(D) 12
Option b – 8
Bast fibers are nothing but
(A) xylem sclerenchymatous cells
(B) thick-walled tracheids
(C) phloem fibers
(D) sieve elements
Option c – phloem fibers
Read the following statements and choose the correct option. Statement I: Cytokinins are synthesized in the regions where rapid cell division occurs. Statement II: Cytokinins promote the senescence of leaves and fruit.
(A) Statement I is correct.
(B) Statement II is correct.
(C) Both statements I and II are correct.
(D) Both statements I and II are incorrect.
Option a – Statement I is correct.
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