Biomolecules PYQs Set 1 (PDF)

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Biomolecules · Set 1 (Q1-30)
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1. $Which of the given statements is INCORRECT about glycogen ?$ (1) $It is a straight chain polymer similar to amylose.$ (2) $Only α - linkages are present in the molecule.$ (3) $It is present in animal cells.$ (4) $It is present in some yeast and fungi.$ 2. $The hormone that helps in the conversion of glucose to glycogen is$ (1) $cortisone$ (2) $bile acids$ (3) $adrenaline$ (4) $insulin$ 3. $Given below are two statements: Statement I: D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine Statement II : Starch, on heating with concentrated sulfuric acid at 100^{\circ} C and 2 - 3 atmosphere pressure produces glucose. choose the correct answer from the options given below$ (1) $Statement I is false but Statement II is true$ (2) $Both Statement I and Statement II are false$ (3) $Both Statement I and Statement II are true$ (4) $Statement I is true but Statement II is false$ 4. $Out of the following, which type of interaction is responsible for the stabilisation of α -helix structure of proteins?$ (1) $Ionic bonding$ (2) $Hydrogen bonding$ (3) $vander Waals forces$ (4) $Covalent bonding$ 5. $Which one of the amino acids can be synthesised in the body?$ (1) $Alanine$ (2) $Lysine$ (3) $Valine$ (4) $Histidine$ 6. $Which one of the following compounds contains β - C1 - C4 glycosidic linkage?$ (1) $Lactose$ (2) $Sucrose$ (3) $Maltose$ (4) $Amylose$ 7. $Which of the following hormones modulate inflammatory reactions?$ (1) $Mineralocorticoids$ (2) $Glucocorticoids$ (3) $Epinephrine$ (4) $Glucagon$ 8. $The correct statement regarding RNA and DNA, respectively is$ (1) $the sugar component in RNA is a arabinose and the sugar component in DNA is ribose$ (2) $the sugar component in RNA is 2^{'} ‐deoxyribose and the sugar component in DNA is arabinose$ (3) $the sugar component in RNA is arabinose and the sugar component in DNA is 2‐deoxyribose$ (4) $the sugar component in RNA is ribose and the sugar component in DNA is 2‐deoxyribose.$ 9. $The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:$ (1) $3$ (2) $8$ (3) $6$ (4) $4$ 10. $The function of enzymes in the living system is to$ (1) $catalyse biochemical reactions$ (2) $provide energy$ (3) $transport oxygen$ (4) $provide immunity$ 11. $Which one of the following sets of monosaccharides forms sucrose?.$ (1) $α - D ‐galactopyranose and α - D ‐glucopyranose$ (2) $α - D ‐glucopyranose and β - D ‐fructofuranose$ (3) $β - D ‐glucopyranose and α - D ‐fructofuranose$ (4) $α - D ‐glucopyranose and β - D ‐fructopyranose.$ 12. $Match List-I with List-II. List-I Natural Amino acid (A) Arginine (B) Aspartic acid (C) Asparagine (D) Alanine List-II One Letter Code (I) D (II) N (III) A (IV) R Choose the correct answer from the options given below:$ (1) $(A)-IV, B-I, (C)-II, (D)-III$ (2) $(A)-I, B-III, (C)-IV, (D)-II$ (3) $(A)-III, B-I, (C)-II, (D)-IV$ (4) $(A)-IV, B-I, (C)-III, (D)-II$ 13. $Identify the correct statements.(A) Arginine and Tryptophan are essential amino acids.(B) Histidine does not contain heterocyclic ring in its structure.(C) Proline is a six membered cyclic ring amino acid.(D) Glycine does not have chiral center.(E) Cysteine has characteristic feature of side chain as MeS - CH_{2} - CH_{2} - . Choose the correct answer from the options given below:$ (1) $(A) and (D) Only$ (2) $(B) and (E) Only$ (3) $(C) and (E) Only$ (4) $(C) and (D) Only$ 14. $Identify the correct statement related to amino acids$ (1) $Nonessential amino acids cannot be synthesized in the body .$ (2) $These are soluble in ether$ (3) $These are low melting solid substances$ (4) $In aqueous solution they exist as zwitter ion$ 15. $Which one of the following is a water soluble vitamin, that is not excreted easily?$ (1) $Vitamin B_{2}$ (2) $Vitamin B_{1}$ (3) $Vitamin B_{6}$ (4) $Vitamin B_{12}$ 16. $The reaction of concentrated sulphuric acid with carbohydrates (C_{12} H_{22} O_{11}) is an example Of [NEET 2020]$ (1) $dehydration$ (2) $oxidation$ (3) $reduction$ (4) $sulphonation$ 17. $Coagulation of egg, on heating is because of :$ (1) $The secondary structure of protein remains unchanged$ (2) $Denaturation of protein occurs$ (3) $Biological property of protein remains unchanged$ (4) $Breaking of the peptide linkage in the primary structure of protein occurs$ 18. $Identify the incorrect statement from the following$ (1) $Amylose is a branched chain polymer of glucose$ (2) $Starch is a polymer of α -D glucose$ (3) $β -Glycosidic linkage makes cellulose polymer$ (4) $Glycogen is called as animal starch$ 19. $Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of$ (1) $L-sugar component$ (2) $Chiral phosphate unit$ (3) $Base unit$ (4) $D-sugar component$ 20. $Which one of the following bases is not present in DNA ?$ (1) $Quinoline$ (2) $Adenine$ (3) $Cytosine$ (4) $Thymine$ 21. $The increasing order of pKa of the following amino acids in aqueous solution is : Gly Asp Lys Arg$ (1) $Asp < Gly < Arg < Lys$ (2) $Gly < Asp < Arg < Lys$ (3) $Asp < Gly < Lys < Arg$ (4) $Arg < Lys < Gly < Asp$ 22. $Match the following List - I List -II A. Beri Beri I. Riboflavin B. Scurvy II. Thiamine C. Cheilosis III. Pyridoxine D. Rickets IV. Ascorbic acid V. Vitamin D The correct answer is$ (1) $A - III, B - IV, C - III, D - V$ (2) $A-II, B - IV, C - I, D - V$ (3) $A-III, B-V, C-I, D - II$ (4) $A-III, B - V, C-IV, D - II$ 23. $Which one is responsible for production of energy in biochemical reaction?$ (1) $Thyroxine$ (2) $Adrenaline$ (3) $Oestrogen$ (4) $Progesterone$ 24. $The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is$ (1) $56$ (2) $36$ (3) $130$ (4) $86$ 25. $The central dogma of molecular genetics states that the genetic information flows from$ (1) $Amino acids \to Proteins \to DNA$ (2) $DNA \to Carbohydrates \to Proteins$ (3) $DNA \to RNA \to Proteins$ (4) $DNA \to RNA \to Carbohydrates$ 26. $Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is:$ (1) (2) (3) (4) 27. $Hypothyroidism is due to A. High level of iodine in the diet B. Enlargement of thyroid gland C. Low levels of iodine in the diet D. Increased levels of thyroxine$ (1) $A, B$ (2) $B, C$ (3) $A, D$ (4) $C,D$ 28. $From the following number of fat soluble and water soluble vitamins respectively are ADC B_{1} K B_{6} .$ (1) $2,4$ (2) $4,2$ (3) $3,3$ (4) $6,0$ 29. $From the vitamins A, B B_{1}, B_{6}, B_{12}, C, D, E and K, the number vitamins that can be stored in our body is_____$ 30. $2.5 g of protein containing only glycine (C_{2} H_{5} N O_{2}) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5.03 x 1 0^{- 3} bar. The total number of glycine units present in the protein is____ (Given : R = 0.083 L bar K^{- 1} m o l^{- 1})$