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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MCQ on Biomolecules for NEET 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.
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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