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

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

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter4: How Cells Obtain Energy

Section: Chapter Questions

Problem 5RQ: Which of the following is not true about enzymes? a. They are consumed by the reactions they...

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________ are always changed by participating in a reaction. a. Enzymes c. Reactants b. Cofactors d. Coenzymes
Which of the following statements is false? Enzymesa) bind to substrates.b) lower the energy of activation.c) convert coenzymes to products.d) speed up biochemical reactions.e) can be named after the kinds of reaction they catalyze.
Which of the following will happen if the concentration of an enzyme increases for a given substrate?? a. the reaction rate increases similarly b. the rate of the reaction decreases to a point. c. there is no change in the reaction. d. the turnover number decreases at the same rate that the enzyme concentration increases. e. the reaction stops.
In the metabolic pathway, A->B->C->D->E what effect would molecule E likely have on the enzyme that catalyzes A->B? (The answer is A. Could you justify the reason why the answer is A?) a) Allosteric inhibitor b)Allosteric activator c) Competitive inhibitor d) feedback activator e) coenzyme
Which 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.
Enzyme function is often assisted by non-protein helpers or adjuncts, for catalytic activity. A ___ is an organic non-protein adjunct, and a ___ is an inorganic adjunct that may be involved in this function. A) coenzyme; cofactor B) substrate; cofactor C) reactant; substrate D) substrate; reactant
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 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 enzyme
1. Activatotrs are types of A. inhibitor B. cofactor C. enzyme D. substrate 2. Which of the following does NOT affect enzyme selectivity ? A. Electrostatic interactions B. Molecular shape C. hydrophillic Interactions D. None of these answers are correct
All of the following increase enzymatic activity except a. an increase in temperature. b. an increase in pH. c. an increase in concentration of the substrate. d. an increase in concentration of the enzyme that catalyzes the reaction.
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 apply
Which of the following is not true about enzymes: a. They increase ΔG of reactions. b. They are usually made of amino acids. c. They lower the activation energy of chemical reactions. d. Each one is specific to the particular substrate(s) to which it binds.