ions can function as cofacto
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which of the following statements are correct?
a. coenzyme is an alternate name for all cofactors
b. metal ions can function as cofactors
c. all conjugated enzymes contain cofactors
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- ________ are always changed by participating in a reaction. a. Enzymes c. Reactants b. Cofactors d. CoenzymesDoes the enzyme described in each of the following statementsrequire a cofactor to be active?(a) Ni2+ is present in the active site.(b) Addition of FAD allows the reaction to occur.(c) The presence of K+ does not affect the reaction.Which of the following statement regarding enzymes is false? a.) they speed up reaction rates b.) they work within narrow temperature and pH ranges c.) The active site binds the substarate d.) They are consumed in the reactions they catalyze
- Which of the following is TRUE about the enzymatic catalysis of a chemical reaction? A. It increases the energy of the transition state B. It decreases the free energy ∆G so that a reaction can proceed spontaneously C. It decreases the energy of the transition state D. It increases the forward and reverse ratesthe type of enzyme inhibition in which covalent bulky adduct prevents catalysis is ? a) uncompetitive b) reversible c) noncompetitive d) competitive e) IrreversibleWhich of the following statements concerning enzymes is TRUE? a. Enzymes can increase the equilibrium constant of a reaction by 1000-fold. b. The activity of many enzymes can be regulated. c. Many enzymes are consumed in the reactions they catalyze. d. The rate of enzymatic catalysis is independent of pH.
- Which of the following is NOT true of enzymes? a) They may interact chemically with their substrates b) They may catalyze a reaction in both forward and reverse directions. c) They may alter Keq for the reaction that they catalyze. d) They may decrease the entropy of their substrates.Which of the following is most likely to act as a non-competitive inhibitor of an enzymatic reaction? a. A cofactor b. A product c. A reactant d. A molecule that has a similar conformation as a reactant e. another enzymeWhich of the following accurately describes how an enzyme functions? a. reduces the energy content of the products b. allows for the exothermic reaction of materials that are usually endothermic c. changes the reaction mechanism effectively reducing the activation energy d. shifts the equilibrium for the reaction
- Which of the following strategies are used by biological systems to ensure an enzymatic reaction will proceed? a. Addition of reactants b. Coupling with more energetic reactions c. A more positive ∆G d. Removing productsA metal ion required for enzyme activity is called a. cofactor b. a proenzyme c. a subtrate d. a zymogenWhat kind of reaction does each of these enzymes catalyze?(a) A dehydrase(b) A carboxylase(c) A protease
