Isoenzymes are (A) Chemically, immunologically and electrophoretically different forms of an enzyme (B) Different forms of an enzyme similar in all properties (C) Catalysing different reactions (D) Having the same quaternary structures like the enzymes

1 Answer

Answer :

Answer :  A

Related questions

Description : Isozymes or iso enzymes are those enzyme which A- have same structural forms B- have different structural forms but identical catalytic properties C- catalyses oxidation reactions D- none of these

Last Answer : have different structural forms but identical catalytic properties

Description : Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in (A) Blood (B) Saliva (C) Intestine (D) Gland

Last Answer : (B) Saliva

Description : Isoenzymes can be characterized by (A) Proteins lacking enzymatic activity that are necessary for the activation of enzymes (B) Proteolytic enzymes activated by hydrolysis (C) Enzymes with identical primary structure (D) Similar enzymes that catalyse different reaction

Last Answer : Answer : B

Description : Multiple forms of the same enzymes are known as (A) Zymogens (B) Isoenzymes (C) Proenzymes (D) Pre-enzymes

Last Answer : Answer : B

Description : Isozymes or iso enzymes are those enzyme which A- have same structural forms B- have different structural forms but identical catalytic properties C- catalyses oxidation reactions D- none of these

Last Answer : have different structural forms but identical catalytic properties

Description : Template/lock and key theory of enzyme action is supported by (A) Enzymes speed up reaction (B) Enzymes occur in living beings and speed up certain reactions (C) Enzymes determine the direction of reaction (D) Compounds similar to substrate inhibit enzyme activity

Last Answer : Answer : D

Description : Different isoenzymes of an enzyme have the same (A) Amino acid sequence (B) Michaelis constant (C) Catalytic activity (D) All of these

Last Answer : Answer : C

Description : Isoenzymes for a given reaction (A) Have different spedificities (B) Have identical affinities for the same substrate (C) Exhibit different electrophoretic motilities (D) Contain similar ratios of different polypeptide chains

Last Answer : Answer : B

Description : Enzymes having slightly different molecular structure but performing identical activity are (a) holoenzymes (b) isoenzymes (c) apoenzymes (d) coenzymes.

Last Answer : (b) isoenzymes

Description : Pick out the wrong statement. (A) Catalytic activity of enzyme catalysed reactions which is affected by temperature, pH value & chemical agents, is maximum at a temperature of about 45°C ... in enzyme catalysed reactions can be calculated by using the thermodynamic properties of substrates & prod

Last Answer : (C) Enzymes help in increasing the activation energy of the reaction

Description : Which are the forces that maintain the second- ary, tertiary and quaternary structures of a pro- tein?

Last Answer : Hydrogen bonds, Electrostatic bonds, Van der Waalís forces and Hydrophobic bonds.

Description : The first enzyme found to have isoenzymes was (A) Alkaline Phosphatase (B) Lactate dehydrogenase (C) Acid Phosphatase (D) Creatine kinase

Last Answer : Answer : B

Description : The isoenzymes of LDH (A) Differ only in a single amino acid (B) Differ in catalytic activity (C) Exist in 5 forms depending on M and H monomer contents (D) Occur as monomers

Last Answer : Answer : C

Description : Which of the following protein structures does “denaturation” destroy? (a) primary and secondary structures (b) secondary and tertiary structures (c) tertiary and quaternary structures (d) secondary, tertiary, and quaternary structures

Last Answer : secondary, tertiary, and quaternary structures

Description : The most potent viricidal properties: (another format of the same question: ‘Indicate which of the following has viricidal properties’) A. Sodium hypochlorite B. Chlorhexidine C. Glutaraldehyde D. Alcohol 70% E. Quaternary ammonium

Last Answer : A. Sodium hypochlorite

Description : Optically active compounds are capable of (A) Different reactions (B) Rotating plane of polarized light (C) Showing same chemical properties (D) None of these

Last Answer : Answer : B

Description : Prosthetic groups differ from co-enzymes in that (a) they require metal ions for their activity (b) they (prosthetic groups) are tightly bound to apoenzymes (c) their association with apoenzymes is transient (d) they can serve as co-factors in a number of enzyme-catalyzed reactions.

Last Answer : (b) they (prosthetic groups) are tightly bound to apoenzymes

Description : An immunologically mediated reaction to a drug producing stereotyped symptoms unrelated to its pharmacodynamic actions is: A. Hypersensitivity B. Supersensitivity C. Intolerance D. Idiosyncrasy

Last Answer : A. Hypersensitivity

Description : An immunologically mediated reaction to a drug producing stereotyped symptoms unrelated to its pharmacodynamic actions is: A. Hypersensitivity B. Supersensitivity C. Intolerance D. Idiosyncrasy

Last Answer : A. Hypersensitivity

Description : Kel-F is a material, which is (A) Chemically known as Polychlorotrifluoroethylene (PTFE) (B) Having excellent chemical & high temperature resistance (upto 200°C) (C) Having elastomeric properties (D) All (A), (B) and (C)

Last Answer : (D) All (A), (B) and (C)

Description : Isoenzymes of lactate dehydrogenase are useful for the diagnosis of (A) Heart disease (B) Kidney disease (C) Liver disease (D) Both (A) and (C)

Last Answer : Answer : D

Description : All the isoenzymes function with the coenzyme: (A) NADP+ (B) FAD (C) Lipoate (D) NAD+

Last Answer : Answer : D

Description : In which diseases of the following organs, isoenzymes LDH-1 and LDH-2 will be released in plasma? (A) Kidney, R.B.C and Liver (B) Heart, Kidney and R.B.C (C) Heart, Kidney and Liver (D) Heart, Lungs and Brain

Last Answer : Answer : B

Description : The CK isoenzymes present in cardiac muscle is (A) BB and MB (B) MM and MB (C) BB only (D) MB only

Last Answer : Answer : B

Description : The isoenzymes LDH5 is elevated in (A) Myocardial infarction (B) Peptic ulcer (C) Liver disease (D) Infectious diseases

Last Answer : Answer : C

Description : Coenzymes are (A) Heat stable, dialyzable, non protein organic molecules (B) Soluble, colloidal, protein molecules (C) Structural analogue of enzymes (D) Different forms of enzymes

Last Answer : Answer : A

Description : The cyclooxygenase isoenzymes COX-1 and COX-2 differ from each other in that (a) They catalyse different pathways in prostanoid biosynthesis (b) COX–1 is inhibited by aspirin but not COX–2 (c) COX–2 is inhibited by ibuprofen but not COX–1 (d) COX–1 is constitutive while COX–2 is inducible

Last Answer : Ans: D

Description : The cyclooxygenase isoenzymes COX-1 and COX-2 differ from each other in that: A. They catalyse different pathways in prostanoid biosynthesis B. COX-1 is inhibited by aspirin but not COX-2 C. COX-2 is inhibited by ibuprofen but not COX-1 D. COX-1 is constitutive while COX-2 is largely

Last Answer : D. COX-1 is constitutive while COX-2 is largely

Description : In conversion of lactic acid to glucose, three reactions of glycolytic pathway are circumvented, which of the following enzymes do not participate? (A) Pyruvate carboxylase (B) Phosphoenol pyruvate carboxy kinase (C) Pyruvate kinase (D) Glucose-6-phosphatase

Last Answer : Answer : B

Description : Enzymes increases the rate of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Description : Enzymes increase the rates of reactions by (A) Increasing the free energy of activation (B) Decreasing the energy of activation (C) Changing the equilibrium constant of the reaction (D) Increasing the free energy change of the reaction

Last Answer : Answer : B

Description : Enzymes accelerate the rate of reactions by (A) Increasing the equilibrium constant of reactions (B) Increasing the energy of activation (C) Decreasing the energy of activation (D) Decreasing the free energy change of the reaction

Last Answer : Answer : C

Description : The carbon chain of fatty acids is shortened by 2 carbon atoms at a time. This involves successive reactions catalysed by 4-enzymes. These act the following order: (A) Acetyl CoA dehydrogenase, ... CoA dehydrogenase (D) Enoyl hydrase, β-OH acyl CoA dehydrogenase, acyl CoA dehydrogenase, thiolose,

Last Answer : Answer : B

Description : Proteinous substances which catalyze biochemical reactions are known as (A) Activators (B) Catalysts (C) Enzymes (D) Hormones

Last Answer : Answer : C

Description : In conversion of Lactic acid to Glucose, three reactions of Glycolytic pathway are circumvented, which of the following enzymes do not participate? (A) Pyruvate Carboxylase (B) Phosphoenol pyruvate carboxy kinase (C) Pyruvate kinase (D) Glucose-6-phosphatase

Last Answer : C

Description : Arrhenius equation K = Ae-E a / R T In some reactions, Rate of reaction is directly proportional to. Concentration of catalyst Catalyst used in Bio-Chemical reactions is called. Enzymes Reactions catalyzed by light are called as. Photo catalyzed or Photosensitised reactions

Last Answer : Define order of reaction

Description : Give some examples of co-enzymes involved in reactions other than hydrogen transfer.

Last Answer : Thiamine pyrophosphate, pyridoxal phosphate, biotin, co-enzyme A, ATP.

Description : Oral neomycin is beneficial in hepatic coma because: A. In hepatic failure patients it is absorbed from the intestines B. It decreases ammonia production by gut bacteria C. It reacts chemically with ... gut to prevent its diffusion into blood D. It induces ammonia detoxifying enzymes in the liver

Last Answer : B. It decreases ammonia production by gut bacteria

Description : All enzymes chemically speaking are (a) Lipids (b) Carbohydrate (c) proteins (d) All

Last Answer : (c) proteins

Description : All the following statements about epidermal growth factor are true except (A) It is a protein (B) It possess quaternary structure (C) Its receptor is made up of a single polypeptide chain (D) Its receptor possesses tyrosine kinase domain

Last Answer : Answer : B

Description : In protein structure the α-helix and βpleated sheets are example of (A) Primary structure (B) Secondary structure (C) Tertiary structure (D) Quaternary structure

Last Answer : Answer : B

Description : During denaturation of proteins, all of the following are disrupted except (A) Primary structure (B) Secondary structure (C) Tertiary structure (D) Quaternary structure

Last Answer : Answer : B

Description : In quaternary structure, subunits are linked by (A) Peptide bonds (B) Disulphide bonds (C) Covalent bonds (D) Non-covalent bonds

Last Answer : Answer : D

Description : In proteins the α-helix and β-pleated sheet are examples of (A) Primary structure (B) Secondary structure (C) Tertiary structure (D) Quaternary structure

Last Answer : Answer : B

Description : What is meant by quaternary structure of a pro- tein?

Last Answer : Certain polypeptides will aggregate to form one functional protein. This is referred to as the qua- ternary structure.

Description : Stem and loop structures are A- proteins that help partially denatured enzymes to recover their native configuration B- structures in DNA caused by inverted repeats C- structures at the ends of linear eukaryotic DNA molecules D- the bonds between adjacent DNA nucleotides in the same strand

Last Answer : structures in DNA caused by inverted repeats

Description : Pick out the correct statement. (A) In catalytic reactions, the catalyst reacts with the reactants (B) A catalyst initiates a chemical reaction (C) A catalyst lowers the activation energy of ... molecules (D) A catalyst cannot be recovered chemically unchanged at the end of the chemical reaction

Last Answer : (C) A catalyst lowers the activation energy of the reacting molecules

Description : This plant species gives off secretions called Tabasheer which are 97% silica. It is claimed that this is a cure for coughs, asthma and is also an aphrodisiac. It is also true that Tabasheer is chemically inert, but may catalyse some chemical reactions. Where is Tabasheer normally obtained from?

Last Answer : Bamboo.

Description : Hormones (A) Act as coenzyme (B) Act as enzyme (C) Influence synthesis of enzymes (D) Belong to B-complex group

Last Answer : Answer : C