Which of the following is incorrect about enzyme cofactors? a. Some can be metal ions Ob. None; all the other choices are correct O c. The so-called co-substrates are needed in equal [substrates] and they are not recycled Od. Some are called coenzymes which are classified into co-substrates and prosthetic groups
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- Which of the following is incorrect about the enzyme chymotrypsin? a. It catalyzes the addition of water across a double bond O b. It is known as a serine protease O c. Artificial substrates are used to monitor the reaction catalyzed by the enzyme d. It is classified as a hydrolaseSelect the correct option a.A holoenzyme is a catalytically inactive enzyme in the absence of its cofactor b.An enzyme cofactor is the amino acid side group in the enzyme active site c.Each of the option listed here is true d.An apoenzymes is catalytically active RNA molecule e.A co-substrate is a detachable enzyme cofactor required with another substrate for an enzyme reactionCatalase, when in contact, only create bubble with hydrogen peroxide and not with water. This would mean that* A. water needs an activator for the enzyme to function. B. the pH of the water is not the optimum pH for catalase. C. the enzyme catalase is specific with hydrogen peroxide. D. water is less harmful to catalase than hydrogen peroxide.
- Which of the followingdescribe superior properties of enzymes (biological catalysts) over traditional chemical catalysts? a. They are mostly and generally operative under mild temperature, pressure, and pH conditions b. They are regulated only by substrate concentration c. They do not effect the reaction equilibrium, but lower the reaction's activation energy d. They are recycled at the end of the reaction Choose all that applyZymogens are NOT enzymatically active, because O A. they are not yet shaped such that essential proximity and orientation catalysis can occur. B. the active site amino acids have been mutated. O C. they have not yet bound the proper cofactor D. they are always smaller than active enzymes.1)Catalase a. Is catalase activity endothermic or exothermic? b. What classification of enzyme is catalase? c. Give the Enzyme Commission (E.C.) number of catalase. d. Is catalase reusable? answer all and don't copy from other sources I will downvote for sure
- Which of the following is NOT a role of coenzymes? A. Receiver or donor of hydrides in redox reactions B. Receiver or donor of carboxyl groups in reactions that involve carboxyl group transfer. C. Receiver or donor of amino groups in transamination and deamination reactions. D. Receiver or donor of alkyl, alkenyl, acyl, or formyl groups in transfer reactions. E. Receiver or donor of oxygen in oxygenation reactions.Which one of the following statements is true of enzyme catalysts? a. Their catalytic activity is independent of pH. b. They are generally equally active on D and L isomers of a given substrate. c. They can increase the equilibrium constant for a given reaction by a thousand fold or more. d. They can increase the reaction rate for a given reaction by a thousand fold or more. e. To be effective, they must be present at the same concentration as their substrate.26. AN ORGANIC COFACTOR IN A CONJUGATED ENZYME?A. NEITHER VITAMINS NOR MINERALSB. MINERALS C. VITAMINSD. BOTH VITAMINS AND MINERALS 27. WHICH OF THE FOLLOWING STATEMENTS CONCERNING COFACTORS IS INCORRECT?A. VITAMINS CANNOT BE COFACTORSB. SOME COFACTORS ARE METAL IONS C. COFACTOR IS THE NON-PROTEIN PORTION OF ENZYME D. CONJUGATED ENZYMES CONTAIN COFACTORS 28. WHICH OF THE FOLLOWING VITAMINS IS NOT A FAT SOLUBLE VITAMIN? A. VITAMIN E B. VITAMIN C C. VITAMIN A D. VITAMIN D 29. WHAT HAPPENS TO SUBSTRATE MOLECULES AT AN ENZYME ACTIVE SITE?A. ALWAYS REACT WITH OXYGEN B. UNDERGO CHANGE TO A DESIRED PRODUCTS C. BECOME CATALYST C ALWAYS REACT WITH OXYGEN B UNDERGO CHANGE TO A DESIRED PRODUCT D. BECOME COVALENTLY BONDED TO THE ENZYME D. BECOME COVALENTLY BONDED TO THE ENZYME 30. ACTION OF CHEMICAL WARFARE AND ORGANOPHOSPHATE INSECTICIDE ARE BASED ON?A. REVERSIBLE ENZYME INHIBITOR B. IRREVERSIBLE ENZYME INHIBITOR C. REVERSIBLE ENZYME ACTIVATOR D. IRREVERSIBLE ENZYME ACTIVATOR
- Which of the following best explains why enzyme catalysis is affected by a change in pH? A. Change in pH alters ionization states of serine in the active site involved in nucleophilic catalysis B. The ionization states of his, asp and glu involved in acid/base catalysis are altered with change in pH C. Change in pH alters ionization states of contact amino acids in the active site D. All enzymes have optimum pHWhich of the folowing types of inhibitors binds to the active site of an enzyme? Select one: a. Competitive b. All of them C. Uncompetitive O d. NoncompetitiveThe key catalytic amino acids of the lysozyme active site in the free enzyme are Glu 35 with a protonated side chain and Asp 52 with a deprotonated side chain. From this observation, lysozyme requires for effective catalysis. O A. an Asp in a nonpolar environment O B. a Glu that functions as an acid catalyst O C.a Glu functions as a covalent catalyst O D. All of the above