Biomolecules PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions NEET Biology · Biomolecules · Set 1 (Q1-30)
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1. $Cellulose does not form blue colour with lodine because.$ (1) $It breaks down when iodine reacts with it.$ (2) $It is a disaccharide.$ (3) $It is a helical molecule.$ (4) $It does not contain complex helices and hence cannot hold iodine molecules.$ 2. $Which one of the following is the most abundant protein in the animals?$ (1) $Collagen$ (2) $Lectin$ (3) $Insulin$ (4) $Haemoglobin$ 3. $Consider the following statement: A. Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.B. A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.Select the correct option.$ (1) $Both (A) and (B) are true.$ (2) $(A) is true but (B) is false.$ (3) $Both (A) and (B) are false.$ (4) $(A) is false but (B) is true.$ 4. $Which one is the most abundant protein in the animal world?$ (1) $Trypsin$ (2) $Haemoglobin$ (3) $Collagen$ (4) $Insulin$ 5. $Match the following. Choose the correct option from the following: Column-I (A) Inhibitor of catalytic activity (B) Possess peptide bonds (C) Cell wall material in fungi (D) Secondary metabolite Column-II (i) Ricin (ii) Malonate (iii) Chitin (iv) Collagen$ (1) $(A)-(iii), (B)-(i), (C)-(iv), (D)-(ii)$ (2) $(A)-(iii), (B)-(iv), (C)-(i), (D)-(ii)$ (3) $(A)-(ii), (B)-(iii), (C)-(i), (D)-(iv)$ (4) $(A)-(ii), (B)-(iv), (C)-(iii), (D)-(i)$ 6. $Match the following: Column-I (A) Aquaporin (B) Asparagine (C) Abscisic acid (D) Chitin Column-II (i) Amide (ii) Polysaccharide (iii) Polypeptide (iv) Carotenoids Select the correct option:$ (1) $(A)-(ii), (B)-(iii), (C)-(iv), (D)-(i)$ (2) $(A)-(ii), (B)-(i), (C)-(iv), (D)-(iii)$ (3) $(A)-(iii), (B)-(i), (C)-(ii), (D)-(iv)$ (4) $(A)-(iii), (B)-(i), (C)-(iv), (D)-(ii)$ 7. $Three of the following statements about enzymes are correct and one is wrong. Which one is wrong?$ (1) $Enzymes require optimum pH for maximal activity.$ (2) $Enzymes are denatured at high temperature but in certain exceptional organisms they are effective even at temperatures from 80°-90°C.$ (3) $Enzymes are highly specific.$ (4) $Most of the enzymes are proteins but some are lipids.$ 8. $Which one of the following biomolecules is correctly characterized?$ (1) $Palmitic acid - An unsaturated fatty acid with 18 carbon atoms.$ (2) $Adenylic acid - Adenosine with a glucose phosphate molecule.$ (3) $Alanine amino acid - Contains an amino group and an acidic group anywhere in the molecule.$ (4) $Lecithin - A phosphorylated glyceride found in cell membrane.$ 9. $Which of the following is the least likely to be involved in stabilizing the three-dimensional folding of most proteins?$ (1) $Electrostatic interaction$ (2) $Hydrophobic interaction$ (3) $Ester bonds$ (4) $Hydrogen bonds$ 10. $Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of$ (1) $Dinitrogenase$ (2) $succinic dehydrogenase$ (3) $Amylase$ (4) $Lipase$ 11. $Select the option which is not correct with respect to enzyme action$ (1) $Substrate binds with enzyme at its active site$ (2) $Addition of lot of succinate does not reverse the inhibition of Succinic dehydrogenase by malonate$ (3) $A non - competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate$ (4) $Malonate is a competitive inhibitor of Succinic dehydrogenase$ 12. $The chitinous exoskeleton of arthropods is formed by the polymerization of:$ (1) $D - glucosamine$ (2) $N - acetyl glucosamine$ (3) $Lipoglycans$ (4) $Keratin sulphate and chondroitin sulphate$ 13. $Which one of the following is non reducing carbohydrate?$ (1) $Maltose$ (2) $Sucrose$ (3) $Lactose$ (4) $Ribulose 5 - phosphate$ 14. $The transition state structure of the substrate formed during an enzymatic reaction is$ (1) $Temporary but stable$ (2) $Permanent but unstable$ (3) $Temporary and unstable$ (4) $Permanent and stable$ 15. $Exoskeleton of arthropods is composed of:$ (1) $Glucosamine$ (2) $Cutin$ (3) $Cellulose$ (4) $Chitin$ 16. $Which one of the following statement is incorrect?$ (1) $A competitive inhibitor reacts reversibly with the enzyme to form an enzyme inhibitor complex$ (2) $In competitive inhibition, the inhibitor molecule is not chemically change by the enzyme$ (3) $The competitive inhibitor does not affect the rate of breakdown of the enzyme subtract complex$ (4) $The present of the competitive inhibitor decreases the Km of the enzyme for the substrate.$ 17. $Following are the statements with reference to "lipids". A. Lipids having only single bonds are called unsaturated fatty acids. B. Lecithin is a phospholipid. C. Trihydroxy propane is glycerol. D. Palmitic acid has 20 carbon atoms including carboxyl carbon. E. Arachidonic acid has 16 carbon atoms. Choose the correct answer from the options given below.$ (1) $C and D only$ (2) $B and C only$ (3) $B and E only$ (4) $A and B only$ 18. $Identify the statement which is incorrect.$ (1) $Glycine is an example of lipids$ (2) $Lecithin contains phosphorus atom in its structure$ (3) $Tyrosine possesses aromatic ring in its structure$ (4) $Sulphur is an integral part of cysteine$ 19. $Select the correct option with respect to mitosis.$ (1) $Chromatids start moving towards opposite poles in telophase.$ (2) $Golgi complex and endoplasmic reticulum are still visible at the end of prophase.$ (3) $Chromosomes move to the spindle equator and get aligned along the equatorial plate in metaphase.$ (4) $Chromatids separate but remains at the centre of the cell in anaphase.$ 20. $Which of the following are not secondary metabolites in plants?$ (1) $Amino acids, glucose$ (2) $Vinblastin, curcumin$ (3) $Rubber, gums$ (4) $Morphine, codeine$ 21. $A phosphoglyceride is always made up of$ (1) $Only a saturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.$ (2) $Only an unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.$ (3) $A saturated or unsaturated fatty acid esterified to a glycerol molecule to which a phosphate group is also attached.$ (4) $A saturated or unsaturated fatty acid esterified to a phosphate group which is also attached to a glycerol molecule.$ 22. $Macromolecule chitin is$ (1) $Nitrogen containing polysaccharide$ (2) $Phosphorus containing polysaccharide$ (3) $Sulphur containing polysaccharide$ (4) $Simple polysaccharide$ 23. $A typical molecule is made up of$ (1) $Three glycerol molecules and one fatty acid molecule$ (2) $One glycerol and three fatty acid molecules$ (3) $One glycerol and one fatty acid molecule$ (4) $Three glycerol and three fatty acid molecules$ 24. $The essential chemical components of many coenzymes are$ (1) $Proteins$ (2) $Nucleic acids$ (3) $Carbohydrates$ (4) $Vitamins$ 25. $Which one of the following statements is wrong?$ (1) $Sucrose is a disaccharide$ (2) $Cellulose is a polysaccharide$ (3) $Uracil is a pyrimidine$ (4) $Glycine is a sulphur containing amino acid$ 26. $Which of the following biomolecules does have a phosphodiester bond?$ (1) $Monosaccharides in a polysaccharide$ (2) $Amino acids in a polypeptide$ (3) $Nucleic acids in a nucleotide$ (4) $Fatty acids in a diglycerides$ 27. $Identify the incorrect pair.$ (1) $Toxin - Abrin$ (2) $Lectins - Concanavalin A$ (3) $Drugs - Ricin$ (4) $Alkaloids - Codeine$ 28. $The chitinous exoskeleton of arthropods is formed by the polymerisation of :$ (1) $lipoglycans$ (2) $keratin sulphate and chondroitin sulphate$ (3) $D-glucosamine$ (4) $N-acetyl glucosamine$ 29. $Which one of the following is not a constituent of cell membrane?$ (1) $Phospholipids$ (2) $Cholesterol$ (3) $Glycolipids$ (4) $Proline$ 30. $Prosthetic groups differ from co-enzymes in that :-$ (1) $they require metal ions for their activity.$ (2) $they (prosthetic groups) are tightly bound to apoenzymes.$ (3) $their association with apoenzymes is transient.$ (4) $they can serve as co-factors in a number of enzyme-catalyzed reactions.$