Biomolecules PYQs Set 8 (PDF)

Set 8 of 12 · Questions 211-240 of 335

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Biomolecules · Set 8 (Q211-240)
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211. $Sugar moiety in DNA and RNA molecules respectively are$ (1) $β -D-2-deoxyribose, β -D-deoxyribose$ (2) $β -D-2-deoxyribose, β -D-ribose$ (3) $β -D-ribose, β -D-2-deoxyribose$ (4) $β -D-deoxyribose, β -D-2-deoxyribose$ 212. $The two functional groups present in a typical carbohydrate are :$ (1) $-CHO and -COOH$ (2) $>C=O and -OH$ (3) $-OH and -CHO$ (4) $-OH and -COOH$ 213. $Which of the following is the incorrect statement about maltose?$ (1) $It is a reducing sugar$ (2) $It is composed of two α -D-glucose units$ (3) $It is composed of one β -D- glucose and one β - D galactose unit$ (4) $It has 1, 4-glycosidic linkage$ 214. $The deficiency of which vitamin causes pernicious anaemia?$ (1) $Vitamin B_{2}$ (2) $Vitamin B_{6}$ (3) $Vitamin E$ (4) $Vitamin B_{12}$ 215. $Which of the following pairs give positive Tollen’s Test ?$ (1) $Glucose, sucrose$ (2) $Glucose, fructose$ (3) $Hexanol, acetophenone$ (4) $Fructose, sucrose$ 216. $What is the value of specific rotation exhibited by glucose molecule?$ (1) $+ 52.7^{\circ}$ (2) $- 92.4^{\circ}$ (3) $+ 66.5^{\circ}$ (4) $+ 40.3^{\circ}$ 217. $What type of sugar molecule is present in DNA?$ (1) $D-3-Deoxyribose$ (2) $D-Ribose$ (3) $D-2-Deoxyribose$ (4) $D-Glucopyranose$ 218. $A polysaccharide 'X' on boiling with dil H_{2} S O_{4} at 393 K under 2-3 atm pressure yields 'Y'. 'Y' on treatment with bromine water gives gluconic acid. 'X' contains β -glycosidic linkages only.Compound 'X' is :$ (1) $starch$ (2) $cellulose$ (3) $amylose$ (4) $amylopectin$ 219. $The Zwitter ion among the following is$ (1) $R - C H (N H_{2}) - C (= O) - O H$ (2) (3) (4) $R - C H (N H_{3}^{+}) - C (= O) - O^{-}$ 220. $Fructose and glucose can be distinguished by :$ (1) $Benedict's test$ (2) $Fehling's test$ (3) $Barfoed' test$ (4) $Seliwanoff's test$ 221. $Which is not true for arginine?$ (1) $It has a fairly high melting point$ (2) $It is associated with more than one p K_{a} values.$ (3) $It has high solubility in benzene.$ (4) $It is a crystalline solid.$ 222. $The cell membranes are mainly composed of$ (1) $fats$ (2) $proteins$ (3) $phospholipids$ (4) $carbohydrates$ 223. $In DNA, the linkages between different nitrogenous bases are$ (1) $phosphate linkage$ (2) $H ‐bonding$ (3) $glycosidic linkage$ (4) $peptide linkage$ 224. $Identify the essential amino acids from below : (A) Valine (B) Proline (C) Lysine (D) Threonine. (E) Tyrosine Choose the correct answer from the options given below:$ (1) $(A), (C) and (E) only$ (2) $(A), (C) and (D) only$ (3) $(C), (D) and (E) only$ (4) $(B), (C) and (E) only$ 225. $Which of the following is not an essential amino acid?$ (1) $Tyrosine$ (2) $Valine$ (3) $Lysine$ (4) $Leucine$ 226. $Stability of α - Helix structure of proteins depends upon$ (1) $dipolar interaction$ (2) $H-bonding interaction$ (3) $van der Waals forces$ (4) $π -stacking interaction$ 227. $The major product of the reaction is :$ (1) (2) (3) (4) 228. $Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide ?$ (1) $Seliwanoff's test$ (2) $Iodine test$ (3) $Barfoed test$ (4) $Tollen's test$ 229. $Thiol group is present in :$ (1) $Cystine$ (2) $Cysteine$ (3) $Methionine$ (4) $Cytosine$ 230. $Consider the following rections: (i) Glucose + ROH ⟶ dryHCI Acetal \frac{x eq . of}{( CH _{3} CO ) _{2} O} acetyl derivative (ii) Glucose ⟶ Ni / H_{2} A \frac{y eq . of}{( CH _{3} CO ) _{2} O} acetyl derivative (iii) Glucose \frac{z eq . of}{( CH _{3} CO ) _{2} O} acetyl derivative' x', ' y' and ' z' in these reactions are respectively.$ (1) $4,5 & 5$ (2) $4,6 & 5$ (3) $5,4 & 5$ (4) $5,6 & 5$ 231. $The two monomers for the synthesis of nylon 6, 6 are :$ (1) $HOOC (C H_{2})_{4} COOH, H_{2} N (C H_{2})_{6} N H_{2}$ (2) $HOOC (C H_{2})_{6} COOH, H_{2} N (C H_{2})_{6} N H_{2}$ (3) $HOOC (C H_{2})_{4} COOH, H_{2} N (C H_{2})_{4} N H_{2}$ (4) $HOOC (C H_{2})_{6} COOH, H_{2} N (C H_{2})_{4} N H_{2}$ 232. $The oxidation of glucose is one of the most important reactions in a living cell. What is the number of ATP molecules generated in cells from one molecule of glucose?$ (1) $28$ (2) $38$ (3) $12$ (4) $18$ 233. $Which of the statements about“Denaturation”given below are correct. (1) Denaturation of proteins causes loss of secondary and tertiary structures of the protein(2). Denaturation leads to the conversion of double strand of DNA into single strand(3). Denaturation affects primary structure which gets distorted.$ (1) $(2) and (3)$ (2) $(1) and (3)$ (3) $(1) and (2)$ (4) $(1), (2) and (3)$ 234. $Synthesis of each molecule of glucose in photosynthesis involves :$ (1) $18 molecules of ATP$ (2) $10 molecules of ATP$ (3) $8 molecules of ATP$ (4) $6 molecules of ATP$ 235. $On hydrolysis of starch, we finally get$ (1) $glucose$ (2) $fructose$ (3) $both(a) and (b)$ (4) $sucrose.$ 236. $Number of cyclic tripeptides formed with 2 amino acids A and B is:$ (1) $2$ (2) $3$ (3) $5$ (4) $4$ 237. $The compound 'A' is a complementary base of in DNA stands.$ (1) $Uracil$ (2) $Guanine$ (3) $Adenine$ (4) $Cytosine$ 238. $In alanylglycylleucylalanylvaline, the number of peptide linkages is______.$ 239. $A short peptide on complete hydrolysis produces 3 moles of glycine (G), two moles of leucine (L) and two moles of valine (V) per mole of peptide. The number of peptide linkages in it are_______.$ 240. $Total number of essential amino acid among the given list of amino acids is ______he Arginine, Phenylalanine, Aspartic acid, Cysteine, Histidine, Valine, Proline$