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InterviewSolution
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.
| 901. |
Define the following terms : (i) Glycosidic linkage (ii) Invert sugar (iii) Oligosaccharides. |
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Answer» (i) Glycosidic linkage: The two monosaccharides units are joined together through an oxide linkage formed by loss of a molecule of H2O. (ii) Invert sugar: Hydrolysis of sucrose brings about a change in a sign of rotation from dextro (+) to laevo (-) and the product is known as invert sugar. (iii) Carbohydrates that yield two to ten monosaccharides units, on hydrolysis are called Polysaccharides. Examples are starch, cellulose, glycogen etc. |
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| 902. |
Which component of starch is branched polymer of a glucose and insoluble in water ? |
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Answer» Amylopectin component of starch is branched polymer of a glucose and insoluble in water. |
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| 903. |
A mixture of naphthalene and benzoic can be separated by :A. chromatograhicB. sublimationC. fractional crystallisationD. distillation |
| Answer» Correct Answer - a | |
| 904. |
Each question has choices (a), (b), (c ) and (d) out of which ONLY ONR is correct. STATEMENT -1 : Ethanol and phenol can be separated by aq. `NaHCO_(3)`. STATEMENT - 2 : Phenol forms soluble sodium salt with aq.`NaHCO_(3)` whereas ethanol does not.A. Statement -1 is True, Statement-2 is True ,Statement -2 is a correct explanation for Statement -1.B. Statement -1 is True, Statement-2 is True ,Statement -2 is a NOT correct explanation for Statement -1.C. Statement -1 id True , Statement -2 is False.D. Statement -1 and Satement - 2 both are False. |
| Answer» Correct Answer - d | |
| 905. |
Which statement is incorrect ?A. can be differentitated by Lucas regent.B. can be differentiated by `Br_(2)` water.C. `Me-CH_(2)CequivCH " and "Me-CH=CH_(2)` can be differentiated by `NaNH_(2)`D. `CH_(3)-underset(CH_(3))underset(|)(N)-CH_(3) " and " H_(3)C-NH-CH_(3)` can be differentiated by carbyl amine test. |
| Answer» Correct Answer - d | |
| 906. |
Phenol and benzoic acid are separated by:A. `NaHCO_(3)`B. NaOHC. NaD. `NaNH_(2)` |
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Answer» Correct Answer - a `PhOh+NaHCO_(3)rarr"No reaction "` `PhCOOH+NaHCO_(3)rarrPhCOunderset(("salt"))overset(Θ)O Na^(o+)+H_(2)O+CO_(2)` |
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| 907. |
`CH_(3)-overset(O)overset(||)C-CH_(3) " and " CH_(3)-overset(O)overset(||)(C)-H` is differentiated by:A. iodoformB. `NaHSO_(3)`C. 2,4-DNPD. non of these |
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Answer» Correct Answer - d Both compounds give all three test. |
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| 908. |
Choose the correct statement about isoelectric pointA. If pH `gt` isoelectric point amino acid will move towards cathodeB. At this point amino acid is present in the form of Zwitter ionC. If pH `lt` isoelectric point, amino acid will move towards anodeD. Al this point amino acids are basic in nature |
| Answer» Correct Answer - B | |
| 909. |
Amino acids are known to be bullding blocks ofA. ProteinsB. Nucleic acidsC. CarbohydratesD. Vitamins |
| Answer» Correct Answer - A | |
| 910. |
Nucleotides are formed ofA. A phosphoric acid groupB. A nitrogenous baseC. A pentose sugarD. All of these |
| Answer» Correct Answer - D | |
| 911. |
Which of the following is an essential amino acid?A. AsparagineB. GlutamineC. HistidineD. Alanine |
| Answer» Correct Answer - C | |
| 912. |
Which of the following is a female sex hormone?A. AdrenalineB. EsteroneC. CortisoneD. Testosterone |
| Answer» Correct Answer - B | |
| 913. |
The chemical extracted from the plant Rauwolfia sepentina is:A. AspirinB. QuinineC. BithionalD. Reserpine |
| Answer» Correct Answer - D | |
| 914. |
The chemical extracted from the plant Rauwolfia sepentina is:A. AspirinB. QuinineC. Bithional D. Reserpine |
| Answer» Correct Answer - D | |
| 915. |
Which of the following is a plant growth inhibiter?A. HeteroauxinB. GibberrellinsC. CytokinnisD. Abscisic acid `(ABA)` |
| Answer» Correct Answer - D | |
| 916. |
The first sex attractant pheromone identified was that ofA. CatB. DogC. Gypsy mothD. Human |
| Answer» Correct Answer - C | |
| 917. |
To separate a mixture of monosacharides, you would useA. CentrifugeB. ChromatographC. Mass spectometerD. Electrolytic cell |
| Answer» Correct Answer - B | |
| 918. |
Which of the following statements is not correctA. All enzymes found in cell are invariably proteins which catalyse biological reactionsB. Enzymes act efficient at a moderate temperature and `pH`C. Coenzymes increase the activities of enzymesD. Enzymes arenot specific in their action on substrates |
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Answer» Correct Answer - D Enzymes are specific in their action on substrates. |
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| 919. |
Which of the following statement is not correct ?A. Photosynthesis take place in the regions of plant cells called chloroplastsB. Phototraphs synthesis sugars, amino acids, nucleic acids and other nutrients by using chemical energyC. Chemorophs get chemical energy for cellular activities by consuming organic molecules produced by phototrophs and break them down to simple molecules by a process as digestion.D. The `pH` in the stomach is basic. |
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Answer» Correct Answer - D The `pH` in the stomach is acidic. |
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| 920. |
Check the incorrect statement.A. Protiens, like fats and carbohydrates, are primarily used for supplying heat and energy to the body.B. Proteins differ from fats and carbohydrates in that they contain nitrogen.C. Amino acids in proteins have `L-`configuration.D. Enzymes are proteins. |
| Answer» Correct Answer - A | |
| 921. |
The set of reactions in a cell which help in degradation of bigger molecules is calledA. metabolismB. digestionC. anabolismD. catabolism |
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Answer» Correct Answer - D The catabloic reactions involve the breaking down of big and complex molecules in an organism. |
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| 922. |
Which of the following statements is incorrect?A. `alpha-D-`glucose and `beta-D-`glucose are enantiomers.B. `D-`Glyceraldehyde and `L-`glyceraldehyde are epimers.C. The reserve carbohydrate of animals is glycogen.D. Few aldohexoses which react with phenylhydrazine to give identical osaazones are epimers. |
| Answer» Correct Answer - A | |
| 923. |
The Ruff degradation used to reduce the carbon the carbon chain in anA. AlcoholB. AlkeneC. KetoseD. Aldose |
| Answer» Correct Answer - D | |
| 924. |
Which of the following carbohydrates cannot be directly utilised by the human body as a source of energy?A. GlucoseB. SucroseC. GlycogenD. Cellulose |
| Answer» Correct Answer - D | |
| 925. |
Which of the following carbohydrates cannot be directly utilised by the human body as a source of energy?A. StarchB. CelluloseC. GlycogenD. All of these |
| Answer» Correct Answer - B | |
| 926. |
It is best to perform reactions with sugars in _____ mediumA. alkalineB. neutralC. acidicD. neutral or acidic |
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Answer» Correct Answer - C Because the Labry de Bruyn-van Ekenstein rearrangement takes pace in alkaline media. |
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| 927. |
Gluose yields a yellow precipitate when warmed to `100^(@)C` with an excess ofA. hydrogen cyanideB. hydroxylamineC. phenylhydrazineD. semicarbazide |
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Answer» Correct Answer - C Both aldoses and ketoses react with exces of phenylhyrazine to form osazones: `underset(":")overset(CHO)overset(|)(C )HOH overset(3PhNHNH_(2))rarrunderset(":")overset(CH=N NHPh)overset(|)(C)=N NHPh + PhNH_(2)+NH_(3)` One of the difficulties of wrong with carbohydrates is their tendency to form syrups. These are fine for pouring on pancakes at breakfast but hard to work with in the laboratory. Treatment with phenylhydrazine converts corbohydrates into solid osazones, which are readily isolated and purified. They can be identified by their characteristic crystaline forms. |
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| 928. |
Storing carbohydrates in the form of polysaccharides has following advantahes :A. diuring their formation , many molecules of water are removed from monosaccharide ( dehydration synthesis ), condensing the bulk to be stored .B. when necessary ,polysaccsrides are broken down byenzymes for the releare of energyC. Unike small carbohydrates , polysaccharides are rela-tivelt easy to store.D. All of these |
| Answer» Correct Answer - D | |
| 929. |
On hydrolysis which of the following carbohydrates give only glucose?A. LactoseB. CellobioseC. MaltoseD. Sucrose |
| Answer» Correct Answer - B::C | |
| 930. |
Gluose is also calledA. DextroseB. com sugarC. Grape sugarD. All of these |
| Answer» Correct Answer - D | |
| 931. |
How many stereoisomers would you expect for a ketopentose?A. FourB. EightC. SixteenD. Two |
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Answer» Correct Answer - A The structure of a ketopentose is `HOCH_(2) CO (CHOH)_(2) CH_(2) OH` It has 2 structurally different asymmetric `C` atoms. Therefore it exists in four stereoisomeric forms. |
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| 932. |
In sucrose, the glycosidic linkage isA. `alpha` 1:4 linkageB. `alpha` 1:6 linkageC. both `alpha` 1:4 linkage and `alpha` 1:6 linkageD. `alpha` 1:2 linkage |
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Answer» Correct Answer - D Sucrose contains `alpha` 1:2 glycoside linkage. |
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| 933. |
On hydrolysis which of the following carbohydrates give only glucose?A. SucroseB. LactoseC. MaltoseD. Raffinose |
| Answer» Correct Answer - C | |
| 934. |
Which of the following in not a sugar?A. GlycogenB. LactoseC. GlucoseD. Maltose |
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Answer» Correct Answer - A Monosaccharides are oligosaccharides are sugars while polysaccharides are non-sugar. Glycogen is a polysaccharide. |
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| 935. |
How many stereocenters are contained in the aldotetrose?A. FourB. TwoC. FiveD. Three |
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Answer» Correct Answer - B The sturcture of an aldotetrose is `HOCH_(2)CHOHCHOHCHO` It has two stereocentres in the form of 2 structurally different asymmetric `C` atoms |
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| 936. |
Which of the following disaccharide is not a reducing sugar?A. MaltoseB. LactoseC. SucroseD. Both (1) and (2) |
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Answer» Correct Answer - C In sucrose, the two monosaccharide units are linked there reducing centres. Therefore, it is non-reducing sugar. |
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| 937. |
Lactose is made of:A. `alpha`-D -glucose onlyB. `alpha`-D-glycose and `beta`-D-glucoseC. `alpha`-D-glactose and `beta`-D-glucoseD. `beta`-D-galactose and `alpha`-D-glucose |
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Answer» Correct Answer - C Lactose (milk sugar) is a dissaccharide, obtained by condensation of one molecule of `beta`-D-galactopyranose and one molecule of `beta`-D-glucopyranose. |
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| 938. |
Which of the following disaccharide is not a reducing sugar?A. GlucoseB. LactoseC. MaltoseD. Sucrose |
| Answer» Correct Answer - D | |
| 939. |
The sugar that is disaccharide among the following isA. glucoseB. maltoseC. xyloseD. stachyose |
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Answer» Correct Answer - B |
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| 940. |
Glucose when reduced with HI and red phosphorus givesA. n-hexaneB. n-heptaneC. n-pentaneD. n-octane |
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Answer» Correct Answer - A (A) `underset("Glucose")(C_(6)H_(12)O_(6)) overset(HI//Red P)to underset("n-Hexane")(CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)CH_(3))` |
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| 941. |
Glucose is reduced by HI givesA. sorbitolB. n-hexaneC. saccharic acidD. gluconic acid |
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Answer» Correct Answer - B |
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| 942. |
Glucose when reduced with HI and red phosphorus givesA. n-pentaneB. n-butaneC. n-hexaneD. n-heptane |
| Answer» Correct Answer - C | |
| 943. |
Which one of the following statements is worng ?A. Cellulose is a polysaccharideB. Uracil is a pyrmidineC. Glycine is a sulphur containg amino acidD. Sucrose is a disaccharide |
| Answer» Correct Answer - C | |
| 944. |
The polysaccharide used in evaluting the function of human nephron is attined form the _____of Dahlia plant.A. rootB. stemC. seedsD. fruit |
| Answer» Correct Answer - A | |
| 945. |
Which is a worng statement?A. Cellulose is the most abundant homopolysaccharideB. Waxes are simple liqidsC. Glycogen and glucose are two common carbohydrates in animals.D. Steroid is a fatty acid |
| Answer» Correct Answer - D | |
| 946. |
Fattyness is due to the excess ofA. connective tissueB. bloodC. muscular tissueD. adipose tissue |
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Answer» Correct Answer - D |
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| 947. |
Starving person will first use :A. fatsB. glycogenC. blood proteinD. muscle protein |
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Answer» Correct Answer - B |
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| 948. |
Which one of the following is polysaccharide?A. sucroseB. lactoseC. glycogenD. glucose |
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Answer» Correct Answer - C |
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| 949. |
Characteristic feature of haemoglobinA. reversible union with oxygenB. red colourC. presence of cuD. presence of globulin protein |
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Answer» Correct Answer - A |
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| 950. |
Which is not polysaccharide ?A. sucroseB. starchC. glycogenD. cellulose |
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Answer» Correct Answer - A |
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