60 + Interview Questions in Enzymes in Biochemistry Page 1 InterviewSolution

1.	When all the monosaccharides in a polysaccharide are same type, such type of a polysaccharide is called a ___________(a) Glycogen(b) Homoglycan(c) Heteroglycan(d) OligosaccharideI had been asked this question in an international level competition.I'm obligated to ask this question of Polysaccharides in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» CORRECT option is (b) Homoglycan The EXPLANATION is: Homoglycan is a polysaccharide where all the monosaccharides are same TYPE.

Discussion

2.	Which of the following enzyme is responsible for the regulation of biological nitrogen fixation?(a) Dinitrogenase reductase(b) Dinitrogenase oxidase(c) Phosphatase(d) KinaseThe question was posed to me in an online quiz.I would like to ask this question from Regulatory Enzymes in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct answer is (a) Dinitrogenase reductase Explanation: The BACTERIAL ENZYME, dinitrogenase reductase is RESPONSIBLE for the REGULATION of biological NITROGEN fixation.

Discussion

3.	The polypeptide chains in chymotrypsin are linked by ___________(a) Hydrogen bonds(b) Ionic bonds(c) Disulfide bond(d) SH-SH bondI had been asked this question during an interview.I need to ask this question from Examples Of Enzymatic actions in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT option is (c) DISULFIDE bond To explain: The protein consists of three polypeptide CHAINS linked by disulfide BONDS.

Discussion

4.	Lactose is a disaccharide of which of the following sugar units?(a) Glucose and fructose(b) Glucose and galactose(c) Glucose and sucrose(d) Glucose and riboseThis question was posed to me in my homework.This interesting question is from Monosaccharides and Disaccharides topic in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right answer is (B) GLUCOSE and GALACTOSE Best EXPLANATION: Lactose is a disaccharide of glucose and galactose.

Discussion

5.	By what factor chymotrypsin enhances the rate of peptide bond hydrolysis?(a) 10^7(b) 10^8(c) At least 10^9(d) 10^6This question was posed to me during a job interview.This intriguing question comes from Examples Of Enzymatic actions topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT choice is (c) At LEAST 10^9 Easiest explanation: CHYMOTRYPSIN enhances the rate of peptide bond HYDROLYSIS by a factor of at least 10^9.

Discussion

6.	Which of the following enzymes catalyze the ADP-ribosylation of key cellular enzymes or proteins?(a) Diphteria toxin and cholera toxin(b) Dinitrogenase reductase(c) Protein phosphatases(d) KinaseThis question was posed to me in final exam.I need to ask this question from Regulatory Enzymes in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT choice is (a) Diphteria TOXIN and cholera toxin To ELABORATE: The ENZYMES that CATALYSE the ADP-ribosylation and inactivation of key cellular enzymes or proteins are diphteria toxin and cholera toxin.

Discussion

7.	Where does inhibitor binds on enzyme in mixed inhibition?(a) At active site(b) Allosteric site(c) Does not bind on enzyme(d) Binds on substrateThe question was asked in an online interview.Question is from Enzyme Kinetics as an Approach to Understanding Mechanism in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct option is (B) Allosteric site For explanation I would say: The inhibitor binds at a PLACE DIFFERENT from ACTIVE site allosterically.

Discussion

8.	In cell membranes, carbohydrates in glycoproteins or glycolipids are oriented?(a) Towards outside(b) Towards inside(c) Towards outside and inside(d) Randomly distributedThe question was asked in an interview for job.This intriguing question originated from Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right choice is (a) Towards OUTSIDE Easiest explanation: The ORIENTATION of carbohydrates in GLYCOPROTEINS is towards outside in CELL membranes.

Discussion

9.	Anthrone method is preferred in the determination of ___________(a) Carbohydrates(b) Proteins(c) Vitamins(d) FatsThis question was posed to me in quiz.This interesting question is from Monosaccharides and Disaccharides topic in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT option is (a) Carbohydrates For explanation I would say: Carbohydrates are dehydrated with con.H2SO4 to form FURFURAL, which condenses with anthrone to form a GREEN COLOR.

Discussion

10.	Which of the following is false about chymotrypsin?(a) Hydrolytic cleavage of a peptide bond by chymotrypsin has two phases(b) It is activated in the presence of trypsin(c) It is synthesized in the thyroid gland(d) Polypeptide chains in chymotrypsin are linked by S-S bondsThis question was posed to me in an interview for internship.I want to ask this question from Examples Of Enzymatic actions in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT option is (c) It is SYNTHESIZED in the THYROID gland Easiest explanation: CHYMOTRYPSIN is synthesized in the PANCREAS.

Discussion

11.	Which of the following is true about Michaelis-Menten kinetics?(a) Km, the Michaelis constant, is defined as that concentration of substrate at which enzyme is working at maximum velocity(b) It describes single substrate enzymes(c) Km, the Michaelis constant is defined as the dissociation constant of the enzyme-substrate complex(d) It assumes covalent binding occurs between enzyme and substrateI got this question by my school teacher while I was bunking the class.This interesting question is from Enzyme Kinetics as an Approach to Understanding Mechanism topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT answer is (b) It describes single substrate enzymes To explain: Km is DEFINED as the concentration of substrate at which enzyme is working at half of MAXIMUM velocity. It is also a measure of the affinity that the enzyme has for its substrate. Michaelis-Menten kinetics ASSUMES non-covalent binding between enzyme and substrate.

Discussion

12.	Which of the following is an example of reversible inhibitor?(a) DIPF(b) Penicillin(c) Iodoacetamide(d) Protease inhibitorsThis question was posed to me during a job interview.The origin of the question is Enzyme Kinetics as an Approach to Understanding Mechanism in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT ANSWER is (d) PROTEASE inhibitors To EXPLAIN: DIPF, Penicillin and Iodoacetamide are irreversible inhibitors.

Discussion

13.	Which of the following blood group individuals have N-acetylgalactosamine sugar attachment?(a) A(b) B(c) AB(d) OThe question was asked during an interview for a job.I need to ask this question from Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right CHOICE is (a) A Explanation: A BLOOD GROUP of individuals have N-acetylgalactosamine SUGAR ATTACHMENT.

Discussion

14.	Which of the following statements is false about proteoglycans?(a) They hold less amount of water(b) Chondroitin sulfate is a proteoglycan(c) They possess charge(d) They are made of amino acids and sugarsI got this question during an interview for a job.I would like to ask this question from Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct CHOICE is (a) They hold LESS amount of WATER Easiest explanation: They hold large AMOUNTS of water.

Discussion

15.	Which of the following are the structural polysaccharides?(a) Glycogen(b) Starch(c) Chitin(d) GlucoseI got this question in class test.Question is from Polysaccharides in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT ANSWER is (c) CHITIN The best EXPLANATION: Chitin and cellulose are known as structural polysaccharides.

Discussion

16.	Which of the following carbohydrates is a triose?(a) Glucose(b) Ribose(c) Ribulose(d) GlyceraldehydeThe question was posed to me in an interview for job.My doubt stems from Monosaccharides and Disaccharides in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct OPTION is (d) Glyceraldehyde For explanation: Glyceraldehyde is a triose CONTAINING 3 carbons.

Discussion

17.	Which of the following is false about feedback regulation?(a) It is a type of enzymatic activity regulation(b) The synthesis of concerned enzyme is inhibited by interfering with the gene of that enzyme(c) Concentration of enzyme is reduced by the end product(d) The best example is the biosynthesis of L-isoleucine from L-threonine in bacteriaI have been asked this question in semester exam.My query is from Regulatory Enzymes topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT CHOICE is (d) The best EXAMPLE is the biosynthesis of L-isoleucine from L-threonine in bacteria The best I can EXPLAIN: The best example is REDUCTION of HMG CoA reductase enzyme by dietary cholesterol.

Discussion

18.	When the velocity of enzyme activity is plotted against substrate concentration, which of the following is obtained?(a) Hyperbolic curve(b) Parabola(c) Straight line with positive slope(d) Straight line with negative slopeI have been asked this question in homework.I'd like to ask this question from Enzyme Kinetics as an Approach to Understanding Mechanism in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT option is (a) HYPERBOLIC curve To EXPLAIN I would say: At low substrate concentration, the rate of a reaction is determined by the rate of FORMATION of an enzyme-substrate complex.

Discussion

19.	In which of the following forms, glucose is stored in the liver?(a) Glycogen(b) Starch(c) Dextrin(d) CelluloseThe question was asked in a national level competition.This is a very interesting question from Polysaccharides topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct choice is (a) Glycogen To EXPLAIN I would SAY: Glucose in the form of glycogen is STORED in the LIVER and muscles.

Discussion

20.	In which of the following forms, glucose is stored in plants?(a) Glycogen(b) Starch(c) Dextrin(d) CelluloseThis question was posed to me in an interview.This key question is from Polysaccharides in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» CORRECT option is (B) STARCH For explanation I would say: Starch is the storage FORM of glucose in plants.

Discussion

21.	Which of the following has reducing properties?(a) Glucuronic acid(b) Gluconic acid(c) Glucaric acid(d) Mucic acidThis question was posed to me during an interview.This is a very interesting question from Monosaccharides and Disaccharides in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT ANSWER is (a) Glucuronic ACID Explanation: Glucuronic acid has a free aldehyde group which is responsible for reducing PROPERTY.

Discussion

22.	In maltose, between which of the following carbons there is a linkage?(a) C1, C2(b) C2, C3(c) C1, C4(d) C2, C4I got this question in homework.This intriguing question comes from Monosaccharides and Disaccharides topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» CORRECT option is (c) C1, C4 The best I can explain: MALTOSE contains TWO D-glucose residues JOINED by a GLYCOSIDIC linkage between C1 of one glucose residue and C4 of the other.

Discussion

23.	Which of the following catalyzes the reversible reaction of β-D-Glucose to glucose 6-phosphate?(a) Chymotrypsin(b) Hexokinase(c) Enolase(d) TrypsinI got this question in an interview for internship.The origin of the question is Examples Of Enzymatic actions in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT answer is (b) Hexokinase To ELABORATE: Hexokinase catalyzes the REVERSIBLE reaction of β-D-Glucose to glucose 6-phosphate.

Discussion

24.	The catalytic efficiency of two distinct enzymes can be compared based on which of the following factor?(a) Km(b) Product formation(c) Size of the enzymes(d) pH of optimum valueI got this question in a national level competition.Question is from Enzyme Kinetics as an Approach to Understanding Mechanism topic in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» CORRECT OPTION is (a) Km To explain I would say: Km is the substrate concentration. INCREASED substrate concentration increases the rate of REACTION.

Discussion

25.	The molecule which acts directly on an enzyme to lower its catalytic rate is __________(a) Repressor(b) Inhibitor(c) Modulator(d) RegulatorThis question was addressed to me by my school teacher while I was bunking the class.Question is taken from Enzyme Kinetics as an Approach to Understanding Mechanism topic in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct choice is (b) Inhibitor The explanation: An inhibitor is a SUBSTANCE that interferes with the substrate-active site BINDING and slows down the catalytic RATE.

Discussion

26.	Which of the following is the correct Line weaver-Burk equation?(a) \(\frac{1}{V_0} = \frac{K_m}{V_{max} [S]} + \frac{1}{V_{max}} \)(b) \(\frac{1}{V_{max}} = \frac{K_m}{V_0 [S]} + \frac{1}{V_0} \)(c) \(V_0 = \frac{V_{max} [S]}{K_m+[S]} \)(d) \(V_{max} = \frac{V_0⁡ [S]}{K_m+[S]} \)I had been asked this question in quiz.I'm obligated to ask this question of Enzyme Kinetics as an Approach to Understanding Mechanism topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT option is (a) \(\FRAC{1}{V_0} = \frac{K_m}{V_{max} [S]} + \frac{1}{V_{max}} \) For explanation: Line weaver-Burk equation: \(\frac{1}{V_0} = \frac{K_m}{V_{max} [S]} + \frac{1}{V_{max}} \) Michaelis-Menten equation: \(V_0 = \frac{V_{max} [S]}{K_m+[S]} \)

Discussion

27.	Which of the following catalyzes the reversible degradation of 2-phosphoglycerate to phosphoenolpyruvate?(a) Chymotrypsin(b) Hexokinase(c) Enolase(d) TrypsinThe question was posed to me in an interview for internship.The query is from Examples Of Enzymatic actions in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct ANSWER is (C) Enolase The BEST explanation: Enolase CATALYZES the reversible DEGRADATION of 2-phosphoglycerate to phosphoenolpyruvate.

Discussion

28.	Fructose and Glucose can be distinguished by ___________(a) Selwinoff’s reagent(b) Benedict’s reagent(c) Fehling’s reagent(d) Barfoed’s reagentI had been asked this question in semester exam.I'd like to ask this question from Monosaccharides and Disaccharides in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct answer is (a) SELWINOFF’s REAGENT The explanation: Selwinoff’s reagent GIVES positive TEST for fructose.

Discussion

29.	Which of the following enzyme catalyzes a reaction that introduces reduced nitrogen ito cellular metabolism?(a) Bacterial glutamine synthase(b) Bacterial dinitrogenase reductase(c) Bacterial dinitrogenase oxidase(d) PhosphataseI have been asked this question in exam.This question is from Regulatory Enzymes topic in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right answer is (a) BACTERIAL glutamine synthase Easiest EXPLANATION: Bacterial glutamine synthase is one among the most complex regulatory enzymes known. It catalyzes a REACTION that INTRODUCES reduced NITROGEN into cellular metabolism.

Discussion

30.	The active site of chymotrypsin consists of a catalytic triad of which of the following amino acid residues?(a) Serine, histidine and aspartate(b) Serine, histidine and glutamate(c) Threonine, histidine and aspartate(d) Methionine, histidine and aspartateThis question was addressed to me in my homework.The doubt is from Examples Of Enzymatic actions in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct ANSWER is (a) Serine, histidine and ASPARTATE The EXPLANATION: Aspartate HOLDS the histidine side chain in the correct direction to accept proton from serine.

Discussion

31.	Which of the following is false?(a) Allosteric modulators may be inhibitory or stimulatory(b) Based on the nature of modulator, allosteric enzymes are of two types(c) Homotropic allosteric enzymes have the substrate and modulator same(d) Heterotropic allosteric enzymes have the substrate and modulator sameThe question was posed to me at a job interview.This intriguing question comes from Regulatory Enzymes topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right option is (d) Heterotropic allosteric enzymes have the substrate and modulator same The EXPLANATION: In CASE of heterotropic enzymes both substrate and modulator are different.

Discussion

32.	Which of the following is an example of epimers?(a) Glucose & Galactose(b) Glucose & Ribose(c) Mannose & Glucose(d) Galactose & MannoseI got this question in examination.My question comes from Monosaccharides and Disaccharides in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right choice is (a) Glucose & GALACTOSE The explanation is: Both glucose and galactose have the same chemical FORMULA but the orientation of –OH group on C4 MOLECULE in both the compounds are different.

Discussion

33.	Removal of phosphoryl groups is catalyzed by ___________(a) Diphteria toxin and cholera toxin(b) Dinitrogenase reductase(c) Protein phosphatases(d) Protein kinasesI had been asked this question in a job interview.My query is from Regulatory Enzymes in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct choice is (c) Protein phosphatases Best explanation: The enzymes that catalyze the ADP-ribosylation and inactivation of key CELLULAR enzymes or proteins are DIPHTERIA toxin and cholera toxin. Dinitrogenase reductase is responsible for the regulation of BIOLOGICAL nitrogen fixation. The attachment of phosphoryl groups to specific amino acid RESIDUES is catalyzed by protein KINASES.

Discussion

34.	Which of the following is an example for irreversible inhibitor?(a) Disulfiram(b) Oseltamivir(c) Protease inhibitors(d) DIPFThis question was posed to me during an interview.My question comes from Enzyme Kinetics as an Approach to Understanding Mechanism topic in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct choice is (d) DIPF To explain: DISULFIRAM, OSELTAMIVIR and PROTEASE INHIBITORS are REVERSIBLE inhibitors.

Discussion

35.	The rate determining step of Michaelis-Menten kinetics is __________(a) The complex dissociation step to produce products(b) The complex formation step(c) The product formation step(d) None of the mentionedThe question was asked during an interview.This interesting question is from Enzyme Kinetics as an Approach to Understanding Mechanism topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct ANSWER is (a) The COMPLEX dissociation step to produce products For explanation I WOULD say: The breakdown of ES complex is the rate determining step of MICHAELIS Menten kinetics.

Discussion

36.	The red precipitate formed when glucose is heated with “Benedict’s reagent” is ___________(a) Cupric hydroxide(b) Cuprous hydroxide(c) Cupric oxide(d) Cuprous oxideThis question was addressed to me in homework.My enquiry is from Monosaccharides and Disaccharides in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct option is (d) CUPROUS oxide To explain: When reducing sugars are heated in the presence of an alkali and reduce the CUPRIC COMPOUNDS present in the Benedict’s reagent to cuprous compounds which GET PRECIPITATED as insoluble red Cu2O.

Discussion

37.	Which of the following blood group individuals have galactose?(a) A(b) B(c) AB(d) OThis question was posed to me during an interview.The above asked question is from Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT OPTION is (b) B Explanation: B BLOOD GROUP individuals have galactose.

Discussion

38.	The allosteric inhibitor of an enzyme ___________(a) Causes the enzyme to work faster(b) Binds to the active site(c) Participates in feedback regulation(d) Denatures the enzymeThis question was addressed to me in examination.This key question is from Regulatory Enzymes topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct answer is (c) Participates in feedback REGULATION Best explanation: In feedback regulation, enzyme is not directly INHIBITED by the END product instead its SYNTHESIS is inhibited by INTERFERING with the gene of that enzyme.

Discussion

39.	Which of the following is an oligosaccharide linked to protein?(a) Glycolipid(b) Glycoprotein(c) Ganglioside(d) GalactosideThis question was posed to me in an international level competition.Origin of the question is Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right answer is (a) GLYCOLIPID Easiest EXPLANATION: Glycolipid is LINKED to lipid.

Discussion

40.	How many types of enzymatic regulation mechanism occurs in the cells?(a) 2(b) 3(c) 4(d) 5I have been asked this question in semester exam.The query is from Regulatory Enzymes in section Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT option is (d) 5 For explanation I WOULD say: FEEDBACK inhibition, reversible covalent MODIFICATION of enzymes, proteolytic activation of the enzyme, feedback regulation and regulation of ISOZYMES.

Discussion

41.	In which of the following, glucose residues are linked by β1 &arr; 4 glycosidic bonds?(a) Amylose(b) Starch(c) Cellulose(d) GlycogenI had been asked this question during a job interview.This interesting question is from Polysaccharides topic in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The CORRECT option is (C) Cellulose The best I can EXPLAIN: The glucose residues in cellulose are linked by β1 &arr; 4 glycosidic bonds, in CONTRAST to the α1 &arr; 4 bonds of amylose, STARCH and glycogen.

Discussion

42.	The attachment of phosphoryl groups to specific amino acid residues is catalyzed by ___________(a) Diphteria toxin and cholera toxin(b) Dinitrogenase reductase(c) Protein phosphatases(d) Protein kinasesThe question was posed to me in final exam.The query is from Regulatory Enzymes topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right option is (d) Protein kinases For EXPLANATION I WOULD say: The enzymes that catalyse the ADP-ribosylation and inactivation of key cellular enzymes or proteins are diphteria toxin and cholera toxin. Dinitrogenase reductase is responsible for the REGULATION of biological nitrogen fixation. Removal of phosphoryl GROUPS is catalyzed by Protein phosphatases.

Discussion

43.	Which of the following is false about lysozyme?(a) It is an antibacterial agent found in tears and egg white(b) The substrate of lysozyme is peptidoglycan(c) Lysozyme cleaves (β1 → 4) glycosidic C-O bonds between two types of sugar residue in the molecule NAM and NAG(d) It is a bisubstrate enzymeThe question was asked during a job interview.Enquiry is from Examples Of Enzymatic actions topic in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» CORRECT CHOICE is (d) It is a bisubstrate ENZYME For EXPLANATION: HEXOKINASE is the bisubstrate enzyme.

Discussion

44.	What is the general mechanism of an enzyme?(a) It acts by reducing the activation energy(b) It acts by increasing the activation energy(c) It acts by decreasing the pH(d) It acts by increasing the pHI have been asked this question in a national level competition.The above asked question is from Enzyme Kinetics as an Approach to Understanding Mechanism topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Correct answer is (a) It ACTS by reducing the activation energy To elaborate: For the reaction to OCCUR at a FASTER rate, activation energy should be LESS.

Discussion

45.	Which of the following is an analogous to starch?(a) Cellulose(b) Glycogen(c) Sucrose(d) ChitinThe question was asked in my homework.My question comes from Polysaccharides topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right option is (b) Glycogen For EXPLANATION: Glycogen is also KNOWN as ANIMAL STARCH.

Discussion

46.	Which of the following statements are true about the reactions at the active center of chymotrypsin?(a) The aspartate residue gives an electron to histidine(b) The aspartate residue gives a proton to histidine(c) The aspartate residue keeps the histidine in the correct direction(d) A proton moves from the aspartate to serine to histidine in the catalytic triad of chymotrypsinThis question was posed to me in an online interview.The query is from Examples Of Enzymatic actions in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct answer is (C) The ASPARTATE residue KEEPS the histidine in the correct direction For explanation I would say: Aspartate residue accepts a proton from SERINE.

Discussion

47.	Which of the following is an example of bacterial and yeast polysaccharide?(a) Starch(b) Glycogen(c) Cellulose(d) DextransThis question was addressed to me in examination.Query is from Polysaccharides topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» Right CHOICE is (d) Dextrans The BEST explanation: Dental PLAQUE FORMED by BACTERIA on the surface of teeth is rich in dextrans.

Discussion

48.	Which of the following is an example of monosaccharide?(a) Galactose(b) Sucrose(c) Lactose(d) MaltoseI had been asked this question during an online interview.I would like to ask this question from Monosaccharides and Disaccharides in division Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct OPTION is (a) GALACTOSE For explanation: Galactose is a SIMPLE SUGAR that consists of a single polyhydroxy aldehyde.

Discussion

49.	Which of the following takes place due to phosphorylation of isocitrate dehydrogenase?(a) Inhibits the binding of citrate at active site(b) Degrades the enzyme(c) Enhances the substrate-binding affinity(d) No reactionI got this question during an online interview.My question is from Regulatory Enzymes in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» RIGHT option is (a) INHIBITS the BINDING of citrate at active site For explanation I would say: The electrostatic repulsion by the PHOSPHORYL group inhibits the binding of citrate at active site.

Discussion

50.	Which is the enzyme that acts as a regulatory enzyme in a four-step metabolic pathway?(a) First enzyme(b) Fourth enzyme(c) Second enzyme(d) Third enzymeI had been asked this question in an interview for job.The query is from Regulatory Enzymes topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry
Answer» The correct choice is (a) FIRST enzyme The best EXPLANATION: First reaction is the best place to regulate a METABOLIC PATHWAY. So, the first enzyme acts as the regulatory enzyme.

Discussion

Explore topic-wise InterviewSolutions in .

Anthrone method is preferred in the determination of ___________(a) Carbohydrates(b) Proteins(c) Vitamins(d) FatsThis question was posed to me in quiz.This interesting question is from Monosaccharides and Disaccharides topic in section Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following are the structural polysaccharides?(a) Glycogen(b) Starch(c) Chitin(d) GlucoseI got this question in class test.Question is from Polysaccharides in section Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following carbohydrates is a triose?(a) Glucose(b) Ribose(c) Ribulose(d) GlyceraldehydeThe question was posed to me in an interview for job.My doubt stems from Monosaccharides and Disaccharides in section Enzymes, Carbohydrates and Gycobiology of Biochemistry

In which of the following forms, glucose is stored in the liver?(a) Glycogen(b) Starch(c) Dextrin(d) CelluloseThe question was asked in a national level competition.This is a very interesting question from Polysaccharides topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry

In which of the following forms, glucose is stored in plants?(a) Glycogen(b) Starch(c) Dextrin(d) CelluloseThis question was posed to me in an interview.This key question is from Polysaccharides in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry

In maltose, between which of the following carbons there is a linkage?(a) C1, C2(b) C2, C3(c) C1, C4(d) C2, C4I got this question in homework.This intriguing question comes from Monosaccharides and Disaccharides topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following is an example of epimers?(a) Glucose & Galactose(b) Glucose & Ribose(c) Mannose & Glucose(d) Galactose & MannoseI got this question in examination.My question comes from Monosaccharides and Disaccharides in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following blood group individuals have galactose?(a) A(b) B(c) AB(d) OThis question was posed to me during an interview.The above asked question is from Glycoconjugates: Proteoglycans, Glycoproteins and Glycolipids in portion Enzymes, Carbohydrates and Gycobiology of Biochemistry

How many types of enzymatic regulation mechanism occurs in the cells?(a) 2(b) 3(c) 4(d) 5I have been asked this question in semester exam.The query is from Regulatory Enzymes in section Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following is an analogous to starch?(a) Cellulose(b) Glycogen(c) Sucrose(d) ChitinThe question was asked in my homework.My question comes from Polysaccharides topic in chapter Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following is an example of bacterial and yeast polysaccharide?(a) Starch(b) Glycogen(c) Cellulose(d) DextransThis question was addressed to me in examination.Query is from Polysaccharides topic in division Enzymes, Carbohydrates and Gycobiology of Biochemistry

Which of the following is an example of monosaccharide?(a) Galactose(b) Sucrose(c) Lactose(d) MaltoseI had been asked this question during an online interview.I would like to ask this question from Monosaccharides and Disaccharides in division Enzymes, Carbohydrates and Gycobiology of Biochemistry