Which of the following statements concerning metabolic pathways is INCORRECT? a. Metabolic pathways always involve a series of consecutive reactions b. All cyclic metabolic pathways regenerate the starting material for the pathway c. All linear metabolic pathways generate a final product D. No correct response

Which of the following statements concerning metabolic pathways is INCORRECT? a. Metabolic pathways always involve a series of consecutive reactions b. All cyclic metabolic pathways regenerate the starting material for the pathway c. All linear metabolic pathways generate a final product D. No correct response

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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Which of the following is not true about enzymes? a. They are consumed by the reactions they catalyze. 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.
Which of the following statements concerning metabolism and metabolic reactions is CORRECT? A. Anabolism and catabolism are two terms with the same meaning B. Some, but not all, metabolic reactions involve catabolism C. Energy is a by-product of all metabolic reactions D. No correct response
Which of the following are common to all metabolic pathways? a) Citric acid cycle b) Oxidative phosphorylation c) Electron transport chain d) All of the above
What distinguishes a linear metabolic pathway from a cyclic metabolic pathway? A. The last step of the pathway regenerates a reactant for the first step. B. The product inhibits an enzyme in the pathway, slowing or stopping the metabolic pathway. C. A linear pathway runs straight in one direction from reactant to product. D. Enzymes convert reactants into intermediates before separate enzymes convert intermediates into products.
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 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
________ is a regulatory mechanism in which the end product of a metabolic pathway inhibits an enzyme that catalyzes an early step in the pathway. a. Cooperative inhibition b. Feedback inhibition c. Allosteric inhibition d. Non-competitive inhibition e. Metabolic inhibition
The mechanism in which the end product of a metabolic pathway inhibits an either step in the pathway is known as A. Reversible inhibition B. Metabolic inhibition C. Feedback inhibition D. Allosteric inhibition E. Noncoopetative inhibition
Metabolic pathways can function efficiently without external control, and will not overproduce unnecessary product molecules because: a) Large pH shifts speed up reactions b) Cells release lots of heat to accelerate product formation c) End products of a pathway cause early enzymes to change shape and inactivate d) Active sites become saturated as product concentration rises
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.
How could you use the diversity of metabolic pathways that produce the same or similar products to critique this argument? Rank the steps from first to last. a. New enzymes cause modification of the pathway in an advantageous way. b. The biochemical pathway is gradually modified. c. A pathway exists and accomplishes some functions. d. An organism with cellular enzymes has mutations that allow new enzymes to arise.
Which of the following is true of metabolism? A. Degradative reactions require an input of energy. B. Synthetic pathways are anabolic. C. Catabolism and anabolism are linked by O2. D. Catabolic reactions require the breakdown of ATP, and anabolic reactions generate ATP.