Which of the following is not a top category for enzymes according to the International Classification of Enzymes? Transferases Ligases Proteases Isomerases
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Which of the following is not a top category for enzymes according to the International Classification of Enzymes?
Transferases
Ligases
Proteases
Isomerases
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- Which of the following is true of all allosteric enzymes? They have more than one active site on each subunit. They consist of proteins only. They have a nonprotein portion. Binding at one site affects the protein function at a second site. Which of the following explains why glycosides do not undergo mutarotation? There are no longer any stereocenters. There is no longer an anomeric carbon. The ring structure does not open to become the open-chain structure. None of the above is correct.CH₂OH 애 H2COPO 2- ATP OH 1 애 애 어 애 The class of the enzyme catalyzing the reaction shown in this figure is a(n) Choose the one best answer. ligase 매 +ADP 매Which of the following terms describes only the protein component of a typical enzyme? cosubstrate prosthetic group apoenzyme holoenzyme cofactor
- Indicate whether each of the following statements about enzyme terminology is TRUE or FALSE. All conjugated enzymes contain a cofactor. An apoenzyme has both a protein and nonprotein part. Metal ions cannot be present in a cofactor. An apoenzyme is present in all holoenzymes. Simple enzymes cannot contain cofactors. A holoenzyme has both a protein and nonprotein part. Metal atoms are present in all conjugated proteins. A cofactor is present in some, but not all, conjugated enzymes.Another of the six enzyme classes is which of the following? enzymes catalyze. These classes include the transferases, isomerases, and ligases. All enzymes can be categorized in one of six major classes based on the reactions the proteases kinases hydrolases phosphatases endonucleases An important factor that influences the rate of a biochemical reaction is the temperature. Raising the temperature of a biochemical reaction has which effect upon the kinetics of the reaction? a) b) c) d) e) increases the free energy of the reactants increases the free energy of the transition state decreases the free energy of the reactants decreases the free energy of the transition state decreases the free energy of the productsWhich of the following statements regarding enzymes and transition states is true? stabilization of the transition state must be less than stabilization of ES for catalysis to occur binding of substrate to an enzyme often causes strain, thus promoting transition state formation the transition state conformation of an enzyme catalyzed reaction is identical to the conformation seen in the uncatalyzed transition state formation of the transition state always assures that the reaction will proceed to product none of the above are true
- which of the following is a primary function of the active site of an enzyme?True or false Enzymes are not only proteinaceous in nature, but some RNA molecules such as ribozymes can also be enzymes. Group of answer choicesWhich of the following best describes a coenzyme? Small charged ions like Fe2+ that help an enzyme to do its job Larger molecules like vitamin D that help an enzyme to do its job A source of energy needed to power an energy-requiring chemical reaction Another name for the substrates that an enzyme will act upon Products made from an enzyme-catalyzed reaction
- hich of the following are advantages of quaternary structure? Choose all correct nswers 1) The genes may be for single subunits, rather than requirement for transcription and translation of giant sequences 2) Subunit construction may provide the structural basis for protein regulation 3) Multi-subunit proteins are more water soluble than single subunit proteins of the same size 4) Defects in protein synthesis may be fixed at the subunit level, rather than giant polypeptide level 5) May have multiple active sites - one on each subunitWhich of the following statements is false regarding an enzyme's ability to catalyse a reaction? an enzyme provides a reaction surface and a hydrophilic environment for the reaction to take place an enzyme binds reactants such that they are positioned correctly and can attain their transition-state configurations an enzyme allows the reaction to go through a more stable transition state than would normally be the case an enzyme can weaken bonds in reactants through the binding processThe highest energy point of the serine protease reaction is the formation of the tetrahedral oxyanion intermediate on the original carbonyl carbon of the scissile peptide bond. True or False? DIPF is an irreversible inhibitor of serine proteases. True or False? The acyl-enzyme intermediate is the transition state of the reaction. True or False? Serine proteases are classified as isomerases. True or False?
