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This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1251. |
Glucose `overset(Br_(2)+H_(2)O)rarr` Product,Product is :A. glucaric acidB. gluconic acidC. hexanoic acidD. bromo hexane |
| Answer» Correct Answer - B | |
| 1252. |
Hydrolysis of sucrose is called:A. InhibitionB. saponificationC. inversionD. hydration |
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Answer» Correct Answer - C Hydrolysis of sucrose into glucose and fructose is called inversion. |
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| 1253. |
Carbohydrates that are not cleaved to smaller carbohydrates on attempted hydrolysis are calledA. MonsaccharideB. OligosaccharideC. PolysaccharideD. Disaccharide |
| Answer» Correct Answer - A | |
| 1254. |
Which of the following is not a disaccharideA. maltoseB. sucroseC. lactoseD. dextrose |
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Answer» Correct Answer - D Dextrose or glucose is a monosaccharides |
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| 1255. |
Glucose is an example ofA. aldohexoseB. ketohexoseC. disaccharideD. non-reducing sugar |
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Answer» Correct Answer - A |
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| 1256. |
Which of the following compound is found abundantly in nature?A. FructoseB. StarchC. GlucoseD. Cellulose |
| Answer» Correct Answer - D | |
| 1257. |
Which one of the following compounds is found abundantly in nature? (a) Fructose(b) Starch (c) Glucose (d) Cellulose |
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Answer» (d) Cellulose |
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| 1258. |
Which of the following is a disaccharide?A. LactoseB. StarchC. celluloseD. Fructose |
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Answer» Correct Answer - A Lactose is a disaccharide |
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| 1259. |
Which of the following chemical units is certainly to be found in an enzyme?A. B. C. D. |
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Answer» Correct Answer - C Enzymes are globular proteins which catalyse biochemical reaction (i.e., increase the rate) in the living system. Being proteins, they are characterised by the presence of peptide bond, `(-NH - CO -)`. |
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| 1260. |
Carbohydrates contain?A. `-OH` groupB. `-CHO` groupC. `gt C = O` groupD. All |
| Answer» Correct Answer - D | |
| 1261. |
Which of the following compounds will not show mutarotation ?A. `alpha` -D (+) glucopyranoseB. `beta` -D (+) glucopyranoseC. Methly-`alpha`-D-glucopyranosideD. `beta` - D(+) galacopyranose |
| Answer» Correct Answer - c | |
| 1262. |
Glycogen on hydrolysis gives:A. lactose and glucoseB. only glucoseC. glucose and fructoseD. glucose and maltose |
| Answer» Correct Answer - b | |
| 1263. |
The disaccharides that gives only glucose on hydrolysis isA. LactoseB. maltoseC. sucroseD. xylose |
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Answer» Correct Answer - B |
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| 1264. |
Glucose cannot be classified asA. A hexoseB. A carbohydrateC. An oligosaccharideD. An aldose |
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Answer» Correct Answer - C Glucose cannot be classified as an oligosaccharide. It is a monosaccharide |
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| 1265. |
Which of the following monosaccharides is a pentose?A. GlucoseB. FructoseC. ArabinoseD. Galactose |
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Answer» Correct Answer - C Arabinose is a pentose |
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| 1266. |
Which of the following statements is correctA. Chemically considering digestion is basically hydrolysisB. In reference to biological role, `Ca^(2+)` ions are important in generating the right electode potential across cell membraneC. Sucrose in water is dextrorotatory , `[alpha]_(D) = + 66.4^(@)`. When boiled with di `HCl` the solution becomes laevorotatory, `[alpha]_(D) = - 39.9^(@)`.D. All of these |
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Answer» Correct Answer - D During digestion large molecules are hydrolysed to yield smaller molecules. For example, when we eat proteins they are hydrolysed to yield amino acis. On hydrolysis with dilute acids or enzyme invertase cane sugar (sucrose) gives equimolar mixture of `D - (+) -` glucose and `D - (-) -` fructose. |
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| 1267. |
In addition to an aldehyde group, glucose contains:A. one secondary OH and four primary OH groupsB. one primary OH and four secondary OH groupsC. two primary OH and three secondary OH groupsD. three primary OH and two secondary OH groups |
| Answer» Correct Answer - b | |
| 1268. |
To become a carbohydrate, a compound must contain at least:A. 2 carbon atomsB. 3 carbon atomsC. 4 carbon atomsD. 6 carbon atoms |
| Answer» Correct Answer - b | |
| 1269. |
Which of the following is known as laevulose?A. `L-(+)-` FructoseB. `L-(-)-` RiboseC. `L-(-)-` GlucoseD. `D-(-)-` Fructose |
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Answer» Correct Answer - D Naturally occuring fructose is `D - (-) -` fructose. It is also referred to as fruit sugar, laevulose or hexulose. It occurs in sweet ripe fruits, in the nectar of flowers, and in honey. |
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| 1270. |
The number of stereoismers of aldepentose, excluding cyclic forms isA. 8B. 6C. 4D. 2 |
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Answer» Correct Answer - A An aldopentose possesses the following structure: `HOCH_(2) (CHOH)_(3) CHO` It containes 3 structurally different asymmetric carbon atoms, therefore, leads to `(2)^(3) = 8` optically active forms (4 pairs of enantiomers). |
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| 1271. |
Assertion : Starch give Iodine test. Reason : Starch can hold `I_(2)` molecules in the helical portion.A. If both assertion and reason are true and the reason is the correct explanation of the assertionB. If both assertion and reason are true and the reason is not the correct explanation of the assertionC. If assertion is true but reason is falseD. If both assertion and reason are false |
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Answer» Correct Answer - A (A)Starch gives Iodine test. The starch-`I_(2)` is blue in colour because starch can hold `I_(2)` molecules in the helical portion. |
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| 1272. |
Pentoses and hexoses are the most common Or The simple polyhydroxy ketone molecule containing 3-7 carbons is aA. OligosaccharidesB. DisachharidesC. MonosaccharidesD. polysaccharide |
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Answer» Correct Answer - C ( C) Pentose and hexoses are the common monosaccharides. |
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| 1273. |
According to IUB system, isomerases belong to which class?A. IB. IIIC. VD. IV |
| Answer» Correct Answer - C | |
| 1274. |
Which proteins possess α‐Helix structure? |
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Answer» Keratin and myosin possess α‐Helix structure. |
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| 1275. |
Maltose and glucose areA. oxidising sugarB. reducing sugarsC. first is oxidising and second is reducing sugarD. both are non-reducing sugar |
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Answer» Correct Answer - B |
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| 1276. |
Reaction of glucose with `(CH_3CO)_2O` suggest thatA. pentahydroxy aldehydeB. hydrate of carbonC. pentahydroxy ketoneD. an hexahydric aldehyde |
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Answer» Correct Answer - A |
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| 1277. |
All monosaccharides are defined asA. non reducing sugarsB. reducing sugarsC. hydrolysing sugarD. non-hydrolysing sugars |
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Answer» Correct Answer - D |
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| 1278. |
Which one of the following is not a protein ?A. WoolB. HairC. CelluloseD. Nail |
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Answer» Correct Answer - C |
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| 1279. |
The following cyclic structure represent A. `beta`-(D)-glucofuranoseB. `beta`-(D)-glucopyranoseC. `alpha`-(D)-glucofurnoseD. `alpha`-(D)-glucopyranose |
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Answer» Correct Answer - B |
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| 1280. |
Isomerization of glucose productsA. galactoseB. fructoseC. mannoseD. allose |
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Answer» Correct Answer - B |
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| 1281. |
The secondary structure of proteins is derived fromA. peptide linkageB. hydrogen bondingC. disulphide linkageD. folding of chains |
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Answer» Correct Answer - B The arragement of polypeptide chains assumed as a result of hydrogen bonding is called secondary structure of proteins . |
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| 1282. |
The correct statement about the following disaccharide is: A. ring (a) is pyranose with `alpha`-glycosidic linkB. ring (a) is furanose with `alpha`-glycosidic linkC. ring (b) is furanose with `alpha`-glycosidic linkD. ring (b) is pyranose with `beta`-glycosidic link |
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Answer» Correct Answer - A The six membered cyclic ether is known as pyranose while the five membered cyclic ether is known as furanose. Hence ring (a) is a pyranose and it has `alpha`-glucosidic linkage in the carbohydrate. |
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| 1283. |
During curdling of milk, what happens to sugar present in it? |
| Answer» Curdling of milk is caused due to formation of lactic acid by the bacteria present in milk. It is an example of denaturation of protein. i.e. when a protein is subjected is some physical or chemical changes. Hydrogen bond get disturbed. Globules unfold and helix uncoli and protein loss its biological acturty. | |
| 1284. |
Phenyl alanine `+ NaOH rarr A overset("1 equiv. HCI") (rarr)underset(underset(C)(darr)"2 equiv. HCl")((B))`. |
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Answer» Correct Answer - (A) `PhCH_(2)-underset(underset(NH_(2))(|))(C)H-overset(overset(O)(||))(C)-O^(-)` (B) `PhCH_(2)- underset(underset(.^+NH_(3))(|))(CH)-overset(overset(O)(||))(C)-O^(-)` (C) `PhCH_(2)-underset(underset(.^(+)NH_(3))(|))(CH)-overset(overset(O)(||))(C)-OH`. |
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| 1285. |
How do yout explain the presence of five `-OH` groups in glucose molecule? |
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Answer» Glucose on reaction with acetic anhydride produces glucose pentaacetate. `overset(" "CHO)overset(|)underset(" "CH_(2)OH)underset(|)(" "(CHOH)_(4))overset("Acetic anhydride")rarroverset(" "CHO)overset(|)underset(" ""Glucose pentacetate")underset(" "CHOAc)underset(|)(" "(CHOAc)_(4))` This reaction explain presence of five -`OH` groups. |
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| 1286. |
Point out wrong statement about protemsA. These are polymeric macromoleculesB. They are present in food stuffC. Many of them are hormones and enzymesD. They do not contain CONH group |
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Answer» Correct Answer - D |
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| 1287. |
Which α-helix or β-helix is more stable? |
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Answer» α-helix is right handed and is more stable due to inter molecular H bonding between first and fourth amino acid. |
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| 1288. |
What type of substance is phenyl alanine hydroxylase ? What is its importance for us ? |
| Answer» It is an enzyme. The deficiency of the enzyme causes disease phenyl ketourea. | |
| 1289. |
What are the constituents of sucrose ? |
| Answer» Sucrose `(C_(12)H_(22)O_(11))` has two constituents glucose and fructose linked to each other by glycosidic linkage. | |
| 1290. |
Assertion : All enzymes are made up of protems and all proteins have three dimensional structures. Reason : Secondary structures of proteins are sequence of amino acids.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason are both incorrect. |
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Answer» Correct Answer - D Correct assertion. All enzymes are made up of proteins but all proteins do not have three dimensional structures. Correct reason : Primary structure of proteins is a sequence of amino acids. |
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| 1291. |
Which one of the following statements is incorrect for the sucrose?A. It is obtained from cane sugar.B. It is not reducing sugar.C. On hydrolysis, it gives equal quantities of D-glucose and D-fructose.D. It gives aspartame when it Is heated at `210^@ C` . |
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Answer» Correct Answer - D Sucrose obtained from cane sugar. On hydrolysis of sucrose it gives equimolar mixture of D (+)-glucose and D (-)-fructose. Sucrose is a non-reducing sugar. Sucrose `underset"or invertase"overset(H^+)to ` D(+)-glucose + D(-) - fructose |
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| 1292. |
Why must vit. C be supplied regularly in diet? |
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Answer» As it is water soluble & easily excreted in urine. |
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| 1293. |
Why must vitamin C be supplied regularly in diet? |
| Answer» Vitamin C is water soluble hence, they are regularly excreted in urine and can not be stored in our body, so, they are supplied regularly in diet. | |
| 1294. |
Assertion : Nucleoticles are phosphate esters of nucleosides. Reason : The various nucleotides in proteins are linked either through purine or pyridimine bases.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason are both incorrect. |
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Answer» Correct Answer - C Correct reason. The various nucleotides in proteins are linked through phosphate ester groups. |
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| 1295. |
Why must vitamin C be supplied regularly in diet |
| Answer» Vitamin C is water soluble therefore it is readily excreted in urine and can’t be stored in our body. | |
| 1296. |
Which of the following does not form oxime?A. glucose penta-acetateB. glucoseC. xyloseD. galactose |
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Answer» Correct Answer - A |
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| 1297. |
Which of the following does not form an oxime?A. GlucoseB. Glucose pentaacetateC. ArabinoseD. Galactose |
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Answer» Correct Answer - B Glucose pentaacetate does not form an oxime because the glycosidic - OH group is not free since it is involved in ring formation. As a result, it cannot get converted into the open chain form required for the formation of oxime. |
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| 1298. |
The disease albinism is caused by the deficiency ofA. Phenylalanine hydroxylaseB. TyrosinaseC. EmulsionD. Lactase |
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Answer» Correct Answer - B The deficiency of enzyme tryosinase in the body leads to albinism. |
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| 1299. |
In glycine the basic group isA. `-NH_(2)`B. `-overset(+)(N)H_(3)`C. `-CO OH`D. `-C OO^(-)` |
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Answer» Correct Answer - D In glycine the basic group is `-CO O^(-)` |
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| 1300. |
In aqueous solution amino acids moslty exit asA. `NH_(2)-CHR-COOH`B. `NH_(2)-CHR-COO^(-)`C. `overset(+)(N)H_(3)CHRCOOH`D. `H_(3)overset(+)NCHRCOO^(-)` |
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Answer» Correct Answer - D In aqueous solutions , amino acids mostly exist as zwitter ion or dipolar ion `underset("zwitter ion")(overset(+)NH_(3)-overset(R)overset(|)CH-COO^(-))` |
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