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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 combinations is incorrect?
(A) Alkaloid – Ricin
(B) Lectin – Concanavalin A
(C) Drug – Vinblastin
(D) Toxin – Abrin
Option a – Alkaloid – Ricin
Which of the following is not considered a co-factor?
(A) Prosthetic group
(B) Ribozyme
(C) Metal ion
(D) Co-enzyme
Option b – Ribozyme
Choose the correct option after reading the statements below:
Statement I: Metabolites are maintained at steady levels in living systems.
Statement II: Living organisms function in a non-equilibrium but steady-state condition.
(A) Only Statement I is true
(B) Only Statement II is true
(C) Both statements are true
(D) Both statements are false
Option c – Both statements are true
Which of the following conditions lead to reduced enzyme activity?
(A) Very low temperatures
(B) pH lower than the optimal range
(C) Formation of the enzyme-substrate complex
(D) Both (A) and (B)
Option d – Both (A) and (B)
Which of these molecules aids in the transport of glucose across the plasma membrane?
(A) Glutamine
(B) GLUT-4
(C) Amylase
(D) Trypsin
Option b – GLUT-4
Which among the following is not a function carried out by polysaccharides?
(A) Structural support in plant cell walls
(B) Component of exoskeleton in arthropods
(C) Absorption of vitamins
(D) Storage of energy
Option c – Absorption of vitamins
Identify the mismatched pair:
(A) Uracil : Pyrimidine
(B) Deoxyribose : DNA
(C) Pentose monosaccharide : RNA
(D) Adenine : Purine
Option b – Deoxyribose : DNA
Protein : Peptide bond :: Polysaccharide : ?
(A) Covalent bond
(B) Glycosidic bond
(C) Ester bond
(D) Ionic bond
Option b – Glycosidic bond
Which statement is incorrect regarding similarities between DNA and RNA?
(A) Both contain pentose sugars
(B) Both possess phosphodiester linkages
(C) Both exist as double-stranded molecules in prokaryotes
(D) Both share common purine bases
Option c – Both exist as double-stranded molecules in prokaryotes
Choose the false statement related to enzyme activity:
(A) Enzymes are 3D molecules with a binding cleft called an active site
(B) Substrates change their shape to match the enzyme
(C) After releasing the product, enzymes bind new substrate molecules
(D) The enzyme-substrate complex temporarily forms and breaks down to release products
Option b – Substrates change their shape to match the enzyme
Which statements regarding secondary metabolites are accurate?
i. Beneficial to humans
ii. All their roles in organisms are known
iii. Found only in animal cells
iv. Play a role in ecological interactions
(A) ii and iii
(B) ii and iv
(C) i and iv
(D) i and iii
Option c – i and iv
Identify the phospholipid commonly present in the plasma membrane:
(A) Cytidine
(B) Lecithin
(C) Cholesterol
(D) Collagen
Option b – Lecithin
Which of the following statements about co-enzymes is incorrect?
(A) Many co-enzymes derive from vitamins
(B) Co-enzymes belong to the co-factor group
(C) NAD and NADP are examples of co-enzymes
(D) Co-enzymes bind permanently to apoenzymes
Option d – Co-enzymes bind permanently to apoenzymes
What is a major source for many co-enzymes?
(A) Organic compounds
(B) Vitamins
(C) Apoenzymes
(D) Minerals
Option b – Vitamins
Why is chemical analysis using Cl and CCOOH done on living tissue?
(A) To identify the RNA type
(B) To determine the organic compound content
(C) To measure dry weight
(D) To calculate the molecular formula
Option b – To determine the organic compound content
Which substance inhibits dehydrogenase through competitive inhibition?
(A) Malonate
(B) Fumarate
(C) Citrate
(D) Succinate
Option a – Malonate
Read the statements and choose the correct option:
Statement I: Non-essential amino acids cannot be synthesized by the body.
Statement II: Essential amino acids are synthesized in the human body.
(A) Only Statement I is true
(B) Only Statement II is true
(C) Both statements are true
(D) Both statements are false
Option d – Both statements are false
Which of the following is not classified as a structural polysaccharide?
(A) Pectin
(B) Chitin
(C) Cellulose
(D) Glycogen
Option d – Glycogen
Choose the correctly matched pair:
(A) Arachidonic acid – 21 carbon atoms
(B) Saturated fatty acid – Contains C=C double bond
(C) Palmitic acid – 16 carbon atoms
(D) Unsaturated fatty acid – Lacks double bonds
Option c – Palmitic acid – 16 carbon atoms
How can the age of a plant be determined?
(A) Annual rings
(B) Number of vascular bundles
(C) Count of branches
(D) Presence of medullary rays
Option a – Annual rings
Which of the following causes seed dormancy?
(A) Tough seed coat
(B) Water-impermeable seed coat
(C) Immature embryo
(D) All of these
Option d – All of these
Which micronutrient is associated with delayed flowering?
(A) Nitrogen
(B) Sulfur
(C) Phosphorus
(D) Molybdenum
Option d – Molybdenum
The combination of phellogen, phellem, and phelloderm is known as
(A) Secondary stele
(B) Annual rings
(C) Pericycle
(D) Periderm
Option d – Periderm
A plant kept under 8 hours of light and 16 hours of darkness begins flowering. It is an example of a
(A) Day-neutral plant
(B) Short-day plant
(C) Long-day plant
(D) None of these
Option b – Short-day plant
Why do raisins swell when soaked in water?
(A) Facilitated diffusion
(B) Plasmolysis
(C) Imbibition
(D) Transpiration
Option c – Imbibition
In the transverse section of a dicot root, the endodermis shows waxy material in the form of
(A) Conjunctive tissue
(B) Companion cells
(C) Casparian strip
(D) Cork cambium
Option c – Casparian strip
Which statement is false regarding ground tissues?
(A) Composed of parenchyma, sclerenchyma, and collenchyma
(B) Leaf ground tissue includes chloroplast-rich cells
(C) Ground tissue includes all tissue types, even epidermis and vascular bundles
(D) Both (A) and (C)
Option c – Ground tissue includes all tissue types, even epidermis and vascular bundles
What triggers flowering through the process of vernalization?
(A) Exposure to low temperature
(B) Exposure to high temperature
(C) Long photoperiod
(D) Short photoperiod
Option a – Exposure to low temperature
What does necrosis refer to?
(A) Delay in flowering
(B) Loss of chlorophyll
(C) Tissue death
(D) Suppression of cell division
Option c – Tissue death
Assertion: ABA induces dormancy.
Reason: ABA helps seeds endure dryness and unfavorable growth conditions by initiating dormancy.
(A) Both assertion and reason are correct, and the reason explains the assertion
(B) Both assertion and reason are correct, but the reason doesn’t explain the assertion
(C) Assertion is correct, but the reason is incorrect
(D) Both assertion and reason are incorrect
Option a – Both assertion and reason are correct, and the reason explains the assertion
What will be the osmotic pressure if osmotic potential is -120 kPa?
(A) -100 kPa
(B) +120 kPa
(C) -60 kPa
(D) +12 kPa
Option b – +120 kPa
Which statement is incorrect?
(A) Collenchyma walls contain cellulose, hemicellulose, and pectin
(B) Sclerenchyma cells are thin-walled and contain protoplasm
(C) Parenchyma cells have cellulose-based thin walls
(D) Collenchyma may store food when chloroplasts are present
Option b – Sclerenchyma cells are thin-walled and contain protoplasm
Which meristem is responsible for primary plant growth?
(A) Apical meristem
(B) Cork cambium
(C) Vascular cambium
(D) Both (B) and (C)
Option a – Apical meristem
Select the correct statement(s):
Statement I: A mineral level that reduces dry weight by 10% is toxic.
Statement II: Slight reduction in micronutrients leads to toxicity.
(A) Only Statement I
(B) Only Statement II
(C) Both I and III
(D) Neither I nor III
Option a – Only Statement I
Which of the following is not a xylem component?
(A) Tracheids and vessels
(B) Xylem fibres
(C) Xylem parenchyma
(D) Companion cells
Option d – Companion cells
Apical dominance caused by auxins is counteracted by
(A) Ethylene
(B) Cytokinin
(C) Abscisic acid
(D) Gibberellic acid
Option b – Cytokinin
Which of the following is a xylem element?
(A) Companion cells
(B) Tracheids
(C) Sieve tube elements
(D) Bast fibres
Option b – Tracheids
Pruning in tea plants is carried out to eliminate
(A) Heterophylly
(B) Apical dominance
(C) Pest infestation
(D) Leaf wilting
Option b – Apical dominance
How many ATP molecules are used to produce one ammonia molecule by nitrogenase?
(A) 4
(B) 8
(C) 10
(D) 12
Option b – 8
Bast fibres refer to
(A) Xylem sclerenchyma cells
(B) Thick-walled tracheids
(C) Phloem fibres
(D) Sieve tube elements
Option c – Phloem fibres
Consider the statements and pick the correct option:
Statement I: Cytokinins are produced in actively dividing tissues.
Statement II: Cytokinins promote aging in leaves and fruits.
(A) Only Statement I is true
(B) Only Statement II is true
(C) Both statements are true
(D) Both statements are false
Option a – Only Statement I is true
We covered all the biomolecules class 12 MCQ above in this post for free so that you can practice well for the exam.
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