Description : Which of the following is not true regarding enzymes? (A) They catalyze only a particular type of reaction (B) They remain active even after separation from the source (C) They are destroyed ... They are irreversibly destroyed at high temperature (E) Their activity depends on the pH of the solution
Last Answer : Answer : C
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 : Write the enzymes which catalyse the conversion of pyruvic acid to `CO_(2)` and enthanol
Last Answer : Write the enzymes which catalyse the conversion of pyruvic acid to `CO_(2)` and enthanol
Description : Enzymes which catalyse binding of two substrates by covalent bonds are known as (A) Lyases (B) Hydrolases (C) Ligases (D) Oxidoreductases
Description : Write the enzyme & its coenzymes which catalyse the following reaction:- Pyruvic acid `+NAD^(+)to"ACetylCoA"+CO_2+NADH`
Last Answer : Write the enzyme & its coenzymes which catalyse the following reaction:- Pyruvic acid `+NAD^(+)to"ACetylCoA"+CO_2+NADH`
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 : The enzyme that catalyse the changing of emulsified oils to fatty acids and glycerol is -
Last Answer : The enzyme that catalyse the changing of emulsified oils to fatty acids and glycerol is - A. Pepsin B. Lipase C. Amylase D. Sucrose
Description : 3-β-Hydroxysteroid dehydrogenase and ∆5,4 isomerase catalyse the conversion of the weak androgen DHEA to (A) Androstenedione (B) Testosterone (C) Progesterone (D) Estrone
Last Answer : Answer : A
Description : The enzyme which can catalyse the conversion of glucose to ethyl alcohol is (A) Invertase (B) Maltase (C) Diastase (D) Zymase
Last Answer : (D) Zymase
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 : The following reaction is characteristic of what type of enzymes? 2H2O2 → 2H2O + O2 (A) Peroxides (B) Catalase (C) Dehydrogenase (D) Copper containing oxidases
Description : Which is not true about inorganic catalysts and enzymes? (A) They are specific (B) Inorganic catalysts require specific not needed by enzymes (C) They are sensitive to pH (D) They speed up the rate of chemical reaction
Description : Enzymes are required in traces because they (A) Have high turnover number (B) Remain unused at the end of reaction and are re used (C) Show cascade effect (D) All correct
Last Answer : Answer : D
Description : A scientist wants to make a dna fingerprint and she used polymerase chain reaction and restriction enzymes what should her next step be?
Last Answer : use restriction enzymes is the right answer for apex :)
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
Description : Enzymes are different from catalysts in (A) Being proteinaceous (B) Not used up in reaction (C) Functional at high temperature (D) Having high rate of diffusion
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
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
Description : If a coenzyme is required in an enzyme reaction, the former usually has the function of (A) Acting as an acceptor for one of the cleavage products of the substrate (B) Enhancing the specificity ... C) Increasing the number of receptor sites of the apo enzyme (D) Activating the substrate ENZYMES 167
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
Description : Regulator gene controls chemical synthesis (Operon concept) by (a) Inhibiting transcription of mRNA (b) Inhibiting enzymes (c) Inhibiting passage of mRNA (d) Inhibiting substrate enzyme reaction
Last Answer : Ans. ((a))
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 : The catalytic power of enzymes is due to (a) the presence of amino acids in their structures (b) their high molecular weight (c) their ability to lower the activation energy of the reaction (d) their limited solubility in water and other solvents
Last Answer : Ans:(c)
Description : Genes control (a) Protein synthesis but not heredity (b) Protein synthesis and heredity (c) Heredity but not protein synthesis (d) Biochemical reaction of some enzymes
Last Answer : Ans:(b)
Description : What are the co-enzymes required for the reaction?
Last Answer : Biotin and ATP.
Description : Which of the following is not required for any of the techniques of DNA fingerprinting available at present? (a) Restriction enzymes (b) DNA-DNA hybridisation (c) Polymerase chain reaction (d) Zinc finger analysis
Last Answer : (d) Zinc finger analysis
Description : Stroma in the chloroplasts of higher plant contains (a) light-dependent reaction enzymes (b) ribosomes (c) chlorophyll (d) light-independent reaction enzymes.
Last Answer : d) light-independent reaction enzymes.
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 : Enzymes are destroyed, when the (A) Temperature is very high (B) Reactant's concentration is very high (C) Reactant's concentration is very low (D) Reaction rate is independent of the reactant's concentration
Last Answer : (A) Temperature is very high
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 : At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants. (A) Independent of (B) Directly proportional to (C) Inversely proportional to (D) Proportional to the square of
Last Answer : (A) Independent of
Description : Pick out the wrong statement. (A) Wine, rum & Vodka are prepared by the formulation of fruit juice, sugar beet & rye respectively (B) Protein catalysts are called enzymes (C) The rate ... concentration of reactants at high concentration of enzymes (D) Total sugar content in molasses is about 10%
Last Answer : (D) Total sugar content in molasses is about 10%
Description : Intracellular enzymes A-synthesize cellular material only B- .synthesize cellular material and perform catabolic reaction C- synthesize cellular material and perform anabolic reaction D- only provide energy to the cell
Last Answer : .synthesize cellular material and perform catabolic reaction
Description : Enzymes are a. Inorganic compounds. b. Destroyed in a reaction. b. Proteins. a. Vitamins.
Last Answer : c