Biomolecules PYQs Set 9 (PDF)

Set 9 of 12 · Questions 241-270 of 335

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Biomolecules · Set 9 (Q241-270)
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241. $Assertion (A) : In aqueous solution, amino acids exist in dipolar ion form. Reason (R) : Most of the naturally occurring amino acids have L-configuration. The correct option among the following is$ (1) $(A) is true, (R) is true and (R) is the correct explanation for (A)$ (2) $(A) is true, (R) is true but (R) is not the correct explanation for (A)$ (3) $(A) is true but (R) is false$ (4) $(A) is false but (R) is true$ 242. $Which of the glycosidic linkage galactose and glucose is present in lactose?$ (1) $C-1 of glucose and C-6 of galactose$ (2) $C-1 of galactose and C-4 of glucose$ (3) $C-1 of glucose and C-4 of galactose$ (4) $C-1 of galactose and C-6 of glucose$ 243. $Which one of the following statements is correct?$ (1) $All amino acids except lysine are optically active$ (2) $All amino acids are optically active$ (3) $All amino acids except glycine are optically active$ (4) $All amino acids except glutamic acids are optically active$ 244. $The correct structure of histidine in a strongly acidic solution (pH=2) is :$ (1) (2) (3) (4) 245. $The number of six and five membered rings present in norethindrone (a synthetic progesterone) are respectively$ (1) $2 and 2$ (2) $3 and 1$ (3) $3 and 3$ (4) $3 and 2$ 246. $Given below are two statements: Statement I: Fructose does not contain an aldehydic group but still reduces Tollen's reagent Statement II: In the presence of base, fructose undergoes rearrangement to give glucose. choose the correct answer from the options given below$ (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) $Statement I is false but Statement II is true$ 247. $The correct structure of product ‘P’ in the following reactio is: Asn - Ser + (C H_{3} CO)_{2} O NE t_{3} P (excess)$ (1) (2) (3) (4) 248. $Out of following isomeric forms of uracil, which one is present in RNA ?$ (1) (2) (3) (4) 249. $Number of chiral carbons in β - D -_{(} +_{)} glucose is$ (1) $five$ (2) $six$ (3) $three$ (4) $four$ 250. $Major product of the following reaction is : (1) E t_{3} N (2) Free radical polymerisation$ (1) (2) (3) (4) 251. $Following tetrapeptide can be represented as (F, L, D, Y, I, Q, P are one letter codes for amino acids)$ (1) $FIQY$ (2) $FLDY$ (3) $YQLF$ (4) $PLDY$ 252. $Which is not true statement?$ (1) $α ‐carbon of α ‐amino acid is asymmetric.$ (2) $All proteins are found in L ‐form.$ (3) $Human body can synthesise all proteins they need.$ (4) $At p H = 7 both amino and carboxylic groups exist in ionised form.$ 253. $Which carbon atom of deoxyribose sugar in DNA does not contain bond?$ (1) $C_{5}$ (2) $C_{3}$ (3) $C_{2}$ (4) $C_{1}$ 254. $The structure of Nylon-6 is :$ (1) $- [(C H_{2})_{4} - C (= O) - N (H)]_{n} -$ (2) $- [C (= O) - (C H_{2})_{6} - N (H)]_{n} -$ (3) $- [C (= O) - (C H_{2})_{5} - N (H)]_{n} -$ (4) $- [(C H_{2})_{6} - C (= O) - N (H)]_{n} -$ 255. $Two monomers in maltose are$ (1) $α - D - Glucose, α - D - Glucose$ (2) $α - D - Glucose, β - D - Glucose$ (3) $α - D - Galactose, β - D - Glucose$ (4) $β - D - Galactose ,α-D-Glucose$ 256. $The following carbohydrate is$ (1) $a ketohexose$ (2) $an aldohexose$ (3) $an α-furanose$ (4) $an α-pyranose$ 257. $Which among the following pairs of Vitamins is stored in our body relatively for longer duration?$ (1) $Thiamine and Vitamin A$ (2) $Vitamin A and Vitamin D$ (3) $Thiamine and Ascorbic acid$ (4) $Ascorbic acid and Vitamin D$ 258. $Match List I with List II List I (Bio Polymer) A. Starch B. Cellulose C. Nucleic acid D. Protein List II (Monomer) I. nucleotide II. α -glucose III. β -glucose IV. α -amino acid Choose the correct answer from the options given below :-$ (1) $A-II, B-I, C-III, D-IV$ (2) $A-IV, B-II, C-I, D-III$ (3) $A-I, B-III, C-IV, D-II$ (4) $A-II, B-III, C-I, D-IV$ 259. $Glucose on prolonged heating with HI gives :$ (1) $Hexanoic acid$ (2) $6-iodohexanal$ (3) $n-Hexane$ (4) $1-Hexene$ 260. $Which of the following acids is a vitamin?$ (1) $Adipic acid$ (2) $Ascorbic acid$ (3) $Saccharic acid$ (4) $Aspartic acid$ 261. $Hormone that maintains the blood glucose level within the limit is$ (1) $thyroxine$ (2) $insulin$ (3) $testosterone$ (4) $epinephrine$ 262. $Hydrolysis of nucleic acid gives nitrogenous base sugar and$ (1) $Sulphuric acid$ (2) $Phosphorous acid$ (3) $Sulphurous acid$ (4) $Phosphoric acid$ 263. $Identify non reducing sugar from following.$ (1) $Sucrose$ (2) $Maltose$ (3) $Lactose$ (4) $Glucose$ 264. $Insulin production and its action in human body are responsible for the level of diabetes. This compound belongs to which of the following categories?$ (1) $a co- enzyme$ (2) $a hormone$ (3) $an enzyme$ (4) $an antibiotic$ 265. $The number of complementary hydrogen bond(s) between a guanine and cytosine pair is$ (1) $2$ (2) $1$ (3) $4$ (4) $3$ 266. $The total number of amino acids present in insulin is$ (1) $55$ (2) $1051$ (3) $51$ (4) $100$ 267. $Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : α -halocarboxylic acid on reaction with dil. N H_{3} gives good yield of a amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides. Reason (R) : Amino acids exist in zwitter ion form in aqueous medium. choose the correct answer from the options given below :$ (1) $Both (A) and (R) are correct and (R) is the correct explanation of (A).$ (2) $Both (A) and (R) arc correct but (R) is not the correct explanation of (A).$ (3) $(A) is correct but (R) is not correct.$ (4) $(A) is not correct but (R) is correct.$ 268. $When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is :$ 269. $Number of chiral centres in Pencillin is$ 270. $A peptide synthesized by the reactions of one molecule each of Glycine, Leucine, Aspartic acid and Histidinewill have ____ peptide linkages.$