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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.
| 651. |
Which of the following is an amino acid?A. `H_(2) NCOCOOH`B. `CH_(3)underset(CONH_(2))underset(|)(C )HCOOH`C. `H_(2)NCOOH`D. |
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Answer» Correct Answer - D Amino acids contain amino `(-NH_(2))` and carboxyl `(-COOH)` functional groups. Depending upon the relative position of amino group with respect to carboxyl group, the amino acid can be classified as `alpha, beta, gamma ,delta` and so on. Only `alpha`-amino acids. `H_(2)N - CH (R ) - CO_(2) H`, are obtained on hydrolysis of proteins. They may contain other functional groups also. Compound (4) called proline is different from the other amino acids as it is `2^(@)` amine and also the amino `N` is part of a five - membered ring. |
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| 652. |
The main storage polysaccharide of plants isA. celluloseB. starchC. glycogenD. inulin |
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Answer» Correct Answer - B The polysaccharides are high polymers of the monomeric sugars and have molecular weights that may range from a few thousand to several millions. Starch occurs in all plants. Particularly in their seeds. It is the most important dietary source for human biengs. High content of starch is found in cereals, roots tubers and some vegetables. Plants store their reserve carbohydrates in the form of starch. Glycogen is the reserve polysaccharide of animals whereas starch is the reserve for plants. Glycogen has a structure similar to amylopectin, except it has more cross-linking. The polysaccharide inulin. is hydrolysed by dilute acids to `D - (-) -` fructose. Thus, inulin is `(C_(6) H_(10) O_(5))_(n)`. and n has a value of about 30. It is a white powder, insoluble in cold water, and a gel on cooling. Inulin solution does not give any colour with iodine. |
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| 653. |
The function of DNA isA. to synthesis RNAB. to synthesis necessary proteinsC. to carry the hereditary characterD. all are correct |
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Answer» Correct Answer - D |
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| 654. |
RNA isA. single helix strandB. double helix strandC. triple helix strandD. all of these |
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Answer» Correct Answer - A |
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| 655. |
Cellobiose on hydrolysis producesA. `alpha`-D-glucoseB. `alpha`-D-fructoseC. `beta`-D-glucoseD. `beta`-D-fructose |
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Answer» Correct Answer - C |
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| 656. |
Which of the following carbohydrates develops blue colour on treatment with iodine solution?A. GlucoseB. AmyloseC. StarchD. Fructose |
| Answer» Correct Answer - b,c | |
| 657. |
Which is correct statements?A. Starch is polymer of `alpha`-glucoseB. Amylose is component of celluloseC. In cyclic structure of fructose there are five carbons and one oxygen atomD. glucose and galactose are anomers |
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Answer» Correct Answer - A |
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| 658. |
Which of the following carbohydrates gives a dark blue colour with iodine?A. AmylopectimB. CelluloseC. StrachD. none of these |
| Answer» Correct Answer - C | |
| 659. |
Which of the following carbohydrates gives a dark blue colour with iodine?A. glucoseB. celluloseC. starchD. raffinose |
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Answer» Correct Answer - C See some note worthy points |
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| 660. |
Starch consists of two polymeric units, namelyA. inulin and pectinB. glycogen and cellobioseC. cellulose and cellobioseD. amylose and amylopectin |
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Answer» Correct Answer - D Starch is a polymer of `alpha - D -(+) -` glucose and consists of two components-Amylose and Amylopectin. Natural starch has appoximately 10 - 20% of amylose and 80 - 90% of amylopectin. Amylose is water soluble component which gives blue color with iodine.Chemicall amylose (polysaccharide) is a long straight (unbrached) chain having only `alpha - D - (+) -` glucose units joined together by `alpha`-glycosidic linkages involving `C1` of one glucose and `C4` of the next.it can have 100 - 3000 D-glucose units i.e., its molecular mass can range from 10,000 to 5000,000. Amylopectin is a branched chain polysaccharide insoluble in water which does not give blue color with iodine. It is composed of chains of `25-30 D`-Glucose units joined by `alpha-D-` glycosidic linkages between`C-1` of one glucose unit and `C-4` of the next glucose unit (similar to amylose). However, these chains are connected with each other by 1, 6-linkage. |
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| 661. |
Why the sugar in DNA is a deoxyribose? |
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Answer» The sugar in DNA molecule is called 2’ – deoxyribose because there is no hydroxyl group at 2’ position. |
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| 662. |
Common examples of hexose sugar is/are (A) glucose (B) fructose (C) erythrose (D) both (A) and (B) |
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Answer» The correct answer is (D) both (A) and (B) |
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| 663. |
Deoxyribose sugar in DNA isA. `C_(5)H_(10)O_(5)`B. `C_(5)H_(10)O_(4)`C. `C_(6)H_(12)O_(6)`D. `C_(6)H_(14)O_(5)` |
| Answer» Correct Answer - B | |
| 664. |
Number of carbon in ring of deoxyribose sugar is `:`A. ThreeB. FourC. FiveD. Six |
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Answer» Correct Answer - B (B) Number of carbons in a ring of deoxyribose sugar is four. |
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| 665. |
Which of the following is known as gun cotton?A. Cellulose dinitrateB. Cellulose diacetateC. Celluose trinitrateD. Cellulose triacetate. |
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Answer» Correct Answer - C A number of derivatives of cellulose are used commercially . Most of these are compounds in which two or three of the free hydroxyl groups of each glucose unit have been converted either to an ester or an ether. This conversion substantially alters the physical properties of the material, making it more soluble in orgainc solvents and allowing it to be made into fibres and films. During reaction of cellulose (other than hydrolysis), the chain remains essentialy intact. Like only alcohol, cellulose forms esters. Treating cellulose with acetic anhydride produces the triacetate known as "Arnel" or acetate" widely used in the textile industry. Treatment with a mixture of nitric and sulphuric acid converts cellulose into cellulose nitrite.The properties and used of the product depend upon the extent of nitration. Guncotton, which is used in making explosives (smokeless powder) is very nearly completely nitrated groups cellulose, and is often called cellulose trinitrate (three mitrate groups per glucose unit). Pyroxylin is less highly nitrated material containing between two and three nitrate groups per glucose unit. It is used ion the manufacture of plastics like celluloid and collodion, in photographic film, and in lacquers. it has the disadvantage of being flammable, and form highly toxic nitrogen oxides upon burning. |
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| 666. |
Which of the following carbohydrates develops a deep blueback colour on treatment with iodine solution?A. AmyloseB. AmylopectinC. starchD. Both (1) and (3) |
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Answer» Correct Answer - D A room temperature, starch gives a deep blue-black color, on addition of `I_(2)`. The color changes to reddish-brown when the test is performed at elevated temperatures. Thus, starch can be used for the detection of traces of `I_(2)` generated in a reaction. Amylose in starch traps `I_(2)` molecules its helix, forming a charge-transfer complex with the characteristic blue-black color. At higher temperatures the helix partially unwinds and fewer `I_(2)` molecules are trapped. Upon cooling, the helix reforms, enclosing the `I_(2)`, and the original color returns. Amylopcetin gives a less intense red-brown color because the helical structure is disrupted by the branching of the chain. |
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| 667. |
Celloboise is obtained byA. complete hydrolysis of celluloseB. partial hydrolysis of celluloseC. complete hydrolysis of glycogenD. partial hydrolysis of raffinose |
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Answer» Correct Answer - B |
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| 668. |
Deoxyribose sugar is an example of (A) monosaccharide (B) disaccharide (C) polysaccharide (D) simple protein |
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Answer» The correct answer is (A) monosaccharide |
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| 669. |
Cellulose is a linear polymer ofA. `alpha`-(D) glucoseB. `beta`-(D) glucoseC. `beta`-(D) fructoseD. amylose |
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Answer» Correct Answer - B |
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| 670. |
Cellulose is polymer isA. galactoseB. `alpha`-glucoseC. fructoseD. `beta`-glucose |
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Answer» Correct Answer - D |
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| 671. |
Cellulose is a linear polymer ofA. `beta-D-` glucoseB. `alpha-D-` glucoseC. `alpha-D-` fructoseD. `beta-D`-fructose |
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Answer» Correct Answer - A CellUlose, the chief constituent of the cell walls of plants, is a straight chain polysaccharide composed of only D-glucose units, which are joined by `beta`-glycosidic linkage between `C-1` of one glucose unit and `C - 4` of the next glucose unit. The molecular mass of cellulose is in the range of 50,000 - 500,000 (300 -2500 D-glucose units). It is used in the manufacture of paper, rayon and gun cotton. |
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| 672. |
Celloboise containA. 1-4-`beta`-glucoside bondB. 2-4-`alpha`-glucoside bondC. 1-4-`alpha`-glucoside bondD. 2-4-`beta`-glucoside bond |
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Answer» Correct Answer - A |
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| 673. |
the number of monosaccharide units in a polysaccharide isA. 2B. 9C. 10D. more than 10 |
| Answer» Correct Answer - D | |
| 674. |
Cellulose is a linear polymer ofA. `alpha`-D-glucoseB. `beta`-D- glucoseC. `alpha`-D-FructoseD. `beta`-L-Glucose |
| Answer» Correct Answer - B | |
| 675. |
Which of the following represents the anomer of the compound shown ? A. B. C. D. all of these |
| Answer» Correct Answer - B | |
| 676. |
The simplest monosaccharide made up of three carbons amongst the following is(A) erythrose (B) glucose (C) glyceraldehyde (D) ribose |
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Answer» The correct answer is (C) glyceraldehyde |
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| 677. |
Rapid interconversion of `alpha` D-glucose and `beta`-D-glucose in solution is known as :A. racemisationB. asymmetric inductionC. fluxional isomerisationD. mutarotation |
| Answer» Correct Answer - D | |
| 678. |
Rapid interconversion of `alpha` D-glucose and `beta`-D-glucose in solution is known as :A. racemizationB. asymmetric inductionC. fluxional isomerizationD. mutarotation |
| Answer» Correct Answer - D | |
| 679. |
In cyclic structure of lactose glycosidic linkage present betweenA. C-1 of `beta`-D-glucopyranose and C-2 of `beta`-D-galactopyranoseB. C-4 of `beta`-D-glucopyranose and C-1 of `beta`-D-galactopyranoseC. C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranoseD. C-4 of `beta`-D-glucopyanose and C-1 of `beta`-D-galactopyranose |
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Answer» Correct Answer - B |
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| 680. |
Consider the following statements (I) Maltose consists two molecules of α – D glucose units linked by an α – 1, 4 glycosidic bond. (ii) Maltose act as non-reducing sugar. (iii) Maltose is produced during digestion of cellulose by the enzyme a-amylase. Which of the above statement is / are not correct? (a) (i) only (b) (i) & (iii) (c) (iii) only (d) (ii) & (iii) |
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Answer» (d) (ii) & (iii) |
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| 681. |
In cyclic structure of cane sugar glycosidic bond is formed in betweenA. C-1 of `alpha`-D-glucopyranose and C-5 of `beta`-D-fructofuranoseB. `C-5 of `alpha`-D-glucopyranose and C-1 of `beta`-D-glucopyranoseC. C-1 of `alpha`-(D)-glucopyranose and C-2 of `beta`-(D)-fructofuranoseD. C-2 of `alpha`-(D)-glucopyranose and C-1 of `beta`-(D)-fructofuranose |
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Answer» Correct Answer - C |
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| 682. |
Non-protein part of enzyme is known asA. ApoenzymeB. CofactorC. Inorganic catalystD. Active site |
| Answer» Correct Answer - B | |
| 683. |
The given structure represents a monosaccharide known asltBRgt A. RiboseB. GlucoseC. FructoseD. Raffinose |
| Answer» Correct Answer - A | |
| 684. |
What is peptide bond? Explain its formation. |
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Answer» 1. The covalent bond that links the two amino acids is called a peptide bond. 2. Peptide bond is formed by condensation reaction. |
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| 685. |
During coagulation of egg which change occurs 1) breaking of peptide bond 2) breaking of hydrogen bond 3) breaking of ionic bond 4) breaking of sulphide bondA. only 1B. 1,2,4C. 2,3,4D. 1,2,3,4 |
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Answer» Correct Answer - C |
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| 686. |
Which one of the following act as catalyst in the interconversion of carbonic acid to water and carbondioxide? (a) Lactose (b) Carbonic anhydrase (c) Glycosidase (d) Invertase |
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Answer» (b) Carbonic anhydrase |
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| 687. |
Consider the following statements(i) in sucrose, C1 of a – D – glucose is joined to C2 of D – fructose. (ii) Two monosaccharides are linked by glycosidic linkage. (iii) In sucrose, C of a – D – glucose is joined to C of D – fructose. Which of the above statement is / are correct? (a) (iii) only (b) (i) & (ii) (c) (ii) only (d) (i) & (iii) |
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Answer» (b) (i) & (ii) |
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| 688. |
A peptide bond is formed between A. 1 and 3B. 1 and 2C. 2 and 4D. 2 and 3 |
| Answer» Correct Answer - A | |
| 689. |
Glycosidic bond isA. `C- O-C`B. CONHC. `gt C - O`D. `CHO` |
| Answer» Correct Answer - A | |
| 690. |
Refer to the given graph showing state of ionisation of zwitterion. Select the correct statements regarding zwitterion. (i) Zwitterions can be formed from compunds that contain both acid groups and basic groups in their molecules. (ii) A zwitterion can act either as proton donor or proton acceptor. (iii) A monoamine monocarboxylic `alpha`-amino acid is a acid at high pH as both the groups (amino and carboxyl) lose a proton. (iv) Amino acids in solution at neutral pH exist predominantly as dipolar ions, the amino group is protonated `(-NH_(3)^(+))` and the carboxyl group is deprotonated `(-COO^(-))`. A. (iii) and (iv)B. (i), (ii), (iii) and (iv)C. (i) and (ii)D. (i), (ii) and (iii) |
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Answer» Correct Answer - B Zwitterion is an ion that has a positive and negative charge on the group of atoms. Amino acids in solution at neutral `pH` exist predominantly as zwitterions. In dipolar form, the amino group is protonated `(-NH_(3)^(+))` and the carboxyle group is deprotonated `(-COO^(-))`. The ionisation state of an amino acid varies with `pH`. In acid solution, the amino group is protonated `(-NH_(3)^(+))` and the carboxyl group is not dissociated `(-COOH)`. As the `pH` is raised, the carboxylic acid is the first group to give up a proton. The dipolar form persists until the protonated amino group loses a proton. |
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| 691. |
In maltose glycosidic bond is formed betweenA. Carbon 1 of one glucose molecule and carbon 4 of second glucose moleculeB. Carbon 2 of one glucose molecule and carbon 3 of second glucose moleculeC. Carbon 3 of one glucose molecule and carbon 4 of second glucose moleculeD. Carbon 1 of one glucose molecule and carbon 6 of second molecle |
| Answer» Correct Answer - A | |
| 692. |
In cyclic structure of cellulose glycosidic bond present in betweenA. C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranoseB. C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranoseC. C-1 of `beta`-D-glucopyranose and C-4 of `beta`-D-galactopyranoseD. C-1 of `beta`-D-glucopyanose and C-4 of `beta`-D-galactopyranose |
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Answer» Correct Answer - A |
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| 693. |
Assertion : In protoplasm, protoplasm , protein functions as a buffer . reason : the protein molecule is amphotieric .A. If both assertion and Reason are true and the Reason is the correct explanation of the assertion .B. If both Assertion and Reason ate true , but the reason is not the correct explanation of the assertion .C. If Assertion is true , but Reason is falseD. if both Assertion and Reason are false. |
| Answer» Correct Answer - B | |
| 694. |
Peptide bond is formed when theA. Carboxyl group of one amino acid reacts with the carboxyl group of the next amino acidB. Amino group of one amino acid reacts with the amino group of the next amino acidsC. Carboxyl group of one amino acids reacts with amino group of the next amino acidsD. Amino group of one amino acid react with carboxyl group of the next amino acid |
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Answer» Correct Answer - C (C) Pepide bond is formed when the carboxyl group of one amino acid reats with amino group of the next amino acid. |
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| 695. |
Which enzyme catalyses the hydrolysis of sucrose to fructose and glucose? (a) Lactase (b) invertase (c) Sucrase(d) Zymase |
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Answer» Sucrase catalyses the hydrolysis of sucrose to fructose and glucose. |
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| 696. |
Consider the following statement (i) Lipids are the principal components of cell membranes including cell walls. (ii) Enzymes are biocatalysts that catalyse a specific biochemical reaction. (iii) Carbonic anhydrase enzyme catalyses the hydrolysis of sucrose to fructose and glucose. Which of the above statement is / are correct? (a) (i) only (b) (iii) only (c) (i) & (iii) (d) (ii) & (iii) |
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Answer» (c) (i) & (iii) |
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| 697. |
Glycosidic bond is formed betweenA. Carbon and oxygen atoms of two adjacent monosaccharidesB. Carbon and hydrogen atoms of two adjacent monosaccharidesC. Hydrogen and oxygen atoms of two adjacent monosaccharidesD. Two carbon atoms of two adjacent monosaccharides |
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Answer» Correct Answer - D (D) Glycosidic bond is formed between two carbon atoms of two adjacent monosaccharides. |
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| 698. |
Lactase enzyme hydrolyses the lactose into its constituent as ……… (a) glucose, fructose (b) glucose, galactose (c) fructose only (d) glucose only |
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Answer» (b) glucose, galactose |
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| 699. |
Study the given data and answer the questions that follow. A sample of an enzyme called lactase was isolated from the intestinal lining of a calf. Assays were undertaken to evaluate the activity of the enzyme sample. The substrate of lactase is the disaccharide lactose. Lactase breaks a lactose molecule in two, producing a glucose molecule and a galactose molecule. Two assays were carried out. `{:("Lactose concentration (% w/v)",15,15,15,15,15,15),("Concentration of enzyme smaple (%v/v)",0,5,10,15,20,25),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,25,50,75,100,125):}` `{:("Lactose concentration (% w/v)",0,5,10,15,25,30),("Concentration of enzyme smaple (%v/v)",5,5,5,5,5,5),("Reaction rate "mu"mole glucose "sec^(-1)mL^(-1),0,15,25,35,40,40):}` Which of the following statements can be concluded from the two assays ?A. The reaction rate of the lactase assay is always proportional to the amount of enzyme present.B. The amount of lactose in an assay has no effect on the rate of the reaction.C. The reaction rate of the lactase assay is proportional to the amount of lactose present.D. The reaction rate is proportional to the amount of enzyme present at a lactose concentration of 15%w/v. |
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Answer» Correct Answer - D The reaction rate is proportional to the amount of enzyme present at a lactose concentration of `15% w//v`. The rate of reaction is proportional with the substrate concentration only to a limit, after which any increase in substrate concentration makes no difference in rate of reaction, the rate of reaction then remains constant. |
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| 700. |
Assertion : Lipids provide more energy as compared to carbohydrates on oxidation . Reason : Lipid is the first respiratory substance .A. If both assertion and Reason are true and the Reason is the correct explanation of the assertion .B. If both Assertion and Reason ate true , but the reason is not the correct explanation of the assertion .C. If Assertion is true , but Reason is falseD. if both Assertion and Reason are false. |
| Answer» Correct Answer - C | |