Biomolecules PYQs Set 10 (PDF)

Set 10 of 12 · Questions 271-300 of 335

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Biomolecules · Set 10 (Q271-300)
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271. $If sucrose is boiled with dilute. HCl in alcoholic solution the ratio in which glucose and fructose are formed is$ (1) $1 : 1$ (2) $1 : 2$ (3) $2 : 1$ (4) $4 : 1$ 272. $Chargaff’s rule states that in an organism$ (1) $amount of adenine (a) is equal to that of thymine (T) and the amount of guanine (G) is equal to that of cytosine (c)$ (2) $amount of adenine (a) is equal to that of guanine (G) and the amount of thymine (T) is equal to that of cytosine (c)$ (3) $amount of adenine (a) is equal to that of cytosine (c) and the amount of thymine (T) is equal to that of guanine (G)$ (4) $amounts of all bases are equal.$ 273. $Observe the following statements. I. Sucrose has glycosidic linkage. II. Cellulose is present in both plants and animals. III. Lactose contains D-galactose and D-glucose units. Which of the following statements are correct?$ (1) $(I), (II) and (III)$ (2) $(I) and (II)$ (3) $(II) and (III)$ (4) $(I) and (III)$ 274. $The secondary structure of a protein refers to$ (1) $regular folding patterns of continuous portions of the polypeptide chain$ (2) $three‐dimensional structure, specially the bond between amino acid residues that are distant from each other in the polypeptide chain$ (3) $mainly denatured proteins and structures of prosthetic groups$ (4) $linear sequence of amino acid residues in the polypeptide chain.$ 275. $Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Amylose is insoluble in water. Reason R : Amylose is a long linear molecule with more than 200 glucose units. choose the correct answer from the options given below.$ (1) $Both A and R are correct and R is the correct explanation of A.$ (2) $Both A and R are correct and R is NOT the correct explanation of A.$ (3) $A is correct but R is not correct.$ (4) $A is not correct but R is correct.$ 276. $Identify the trisaccharide from following.$ (1) $Maltose$ (2) $Lactose$ (3) $Raffinose$ (4) $Stachyose$ 277. $Chemically considering digestion is basically$ (1) $anabolism$ (2) $hydrogenation$ (3) $hydrolysis$ (4) $dehydrogenation$ 278. $Which of the following statements about enzymes are true$ (1) $Enzymes catalyse chemical reactions by increasing the activation energy$ (2) $Enzymes are highly specific both in binding chiral substrates and in catalysing their reactions.$ (3) $Enzymes lack in nucleophilic groups.$ (4) $Pepsin is proteolytic enzyme.$ 279. $Which of the following is not a basic amino acid?$ (1) $Proline$ (2) $Lysine$ (3) $Arginine$ (4) $Histidine$ 280. $Which of the following molecules is eliminated during peptide bond formation?$ (1) $H_{2} O$ (2) $NH_{2}$ (3) $CH_{3} OH$ (4) $CO_{2}$ 281. $What are the functional groups present in the structure of maltose?$ (1) $One acetal and one ketal$ (2) $One ketal and one hemiketal$ (3) $Two acetals$ (4) $One acetal and one hemiacetal$ 282. $Maltose on treatment with dilute HCl gives :$ (1) $D-Glucose and D-Fructose$ (2) $D - Fructose$ (3) $D- Galactose$ (4) $D- Glucose$ 283. $The amino acid containing indole part is$ (1) $tryptophan$ (2) $tyrosine$ (3) $proline$ (4) $methionine$ 284. $Among the following compounds, which one is found RNA ?$ (1) (2) (3) (4) 285. $In which of the following amino acids - OH group is present?$ (1) $A, B$ (2) $A, C$ (3) $B, C$ (4) $B, D$ 286. $Which of the following is correct structure of α -anomer of maltose:$ (1) (2) (3) (4) 287. $The correct sequence of amino acids present in the tripeptide given below is :$ (1) $Val - Ser - Thr$ (2) $Thr - Ser - Val$ (3) $Leu - Ser - Val$ (4) $Thr - Ser - Leu$ 288. $Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.$ (1) $N H_{2} - C H_{2} - C O C l and N H_{2} - C H (C H_{3}) - C O O H$ (2) $N H_{2} - C H_{2} - C O C l and N \oplus H_{3} - C H (C H_{3}) - C O C l$ (3) $N H_{2} - C H_{2} - C O O H and N H_{2} - C H (C H_{3}) - C O O H$ (4) $N H_{2} - C H_{2} - C O O H and N H_{2} - C H (C H_{3}) - C O C l$ 289. $Match List-I with List-II List-I (A) Glucose + HI (B) Glucose + B r_{2} water (C) Glucose + acetic anhydride (D) Glucose + H N O_{3} List - II (I) Gluconic acid (II) Glucose pentacetate (III) Saccharic acid (IV) Hexane Choose the correct answer from the options given below$ (1) $(A)-(IV), (B)-(I), (C)-(II), (D)-(III)$ (2) $(A)-(IV), (B)-(III), (C)-(H), (D)-(I)$ (3) $(A)-(III), (B)-(I), (C)-(IV), (D)-(II)$ (4) $(A)-(I), (B)-(IH), (C)-(IV), (D)-(II)$ 290. $What is the functional group present in serine, an aminoacid in addition to - NH_{2} and - COOH groups?$ (1) $- OH$ (2) $- SH$ (3) $- NH -$ (4) $- C (= O) - N H_{2}$ 291. $The correct representation in six membered pyranose form for the following sugar [X] is$ (1) (2) (3) (4) 292. $The Fishcher presentation of D-glucose is given below. The correct structure(s) of β-L-glucopyranose is (are)$ (1) (2) (3) (4) 293. $The incorrect statements regarding enzymes are :(A) Enzymes are biocatalysts.(B) Enzymes are non-specific and can catalyse different kinds of reactions.(C) Most Enzymes are globular proteins.(D) Enzyme - oxidase catalyses the hydrolysis of maltose into glucose. Choose the correct answer from the option given below :$ (1) $(B), (C) and (D)$ (2) $(B) and (D)$ (3) $(A), (B) and (C)$ (4) $(B) and (C)$ 294. $The product ' Q' of the following reactions is$ (1) (2) (3) (4) 295. $A sugar 'X' dehydrates very slowly under acidic condition to give furfural which on further reaction with resorcinol gives the coloured product after sometime. Sugar 'X' is$ (1) $Aldopentose$ (2) $Aldotetrose$ (3) $Oxalic acid$ (4) $Ketotetrose$ 296. $Given below are two statements. Statments I: Maltose has two α -D-glucose units linked at C_{1} and C_{4} and is a reducing sugar. Statement II: Maltose has two monosaccharides: α -D-glucose and β -D-glucose linked at C_{1} and C_{6} and it is a non-reducing sugar. choose the correct answer from the options given below.$ (1) $Both Statement I and Statement II are true$ (2) $Both Statement I and Statement II are false$ (3) $Statement I is true but Statement II is false$ (4) $Statement I is false but Statement II is true$ 297. $The correct structure of Rhumann's Purple, the compound formed in the reaction of ninhydrin with proteins is:$ (1) (2) (3) (4) 298. $The formulas of A and B for the following reaction sequence are$ (1) $A = C_{7} H_{14} O_{8},B = C_{6} H_{14}$ (2) $A = C_{7} H_{13} O_{7}, B = C_{7} H_{14} O$ (3) $A = C_{7} H_{12} O_{8}, B = C_{6} H_{14}$ (4) $A = C_{7} H_{14} O_{8}, B = C_{6} H_{14} O_{6}$ 299. $Number of compounds among the following which contain sulphur as heteroatom is______ Furan, Thiophene, Pyridine, Pyrrole, Cysteine, Tyrosine$ 300. $The total number of carbon atoms present in tyrosine, an amino acid, is_____$