Which of the following statements regarding catalysts is false? * A catalyst increases the rate of a reaction by giving the reaction an alternate pathway with a lower activation energy. * Catalysts don't need to be present in large amounts because they are regenerated during the reaction. * Enzymes act as catalysts in our bodies. * Catalysts do not participate in the reaction. * The shape of an active site on an enzyme is unique, allowing it to react with only one substrate.

Which of the following statements regarding catalysts is false? * A catalyst increases the rate of a reaction by giving the reaction an alternate pathway with a lower activation energy. * Catalysts don't need to be present in large amounts because they are regenerated during the reaction. * Enzymes act as catalysts in our bodies. * Catalysts do not participate in the reaction. * The shape of an active site on an enzyme is unique, allowing it to react with only one substrate.

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.
Enzymes are key components in biological reactions. Which of the following statements about enzyme function in biological systems is FALSE? Enzymes are key components in biological reactions. Which of the following statements about enzyme function in biological systems is FALSE? Enzymes increase the rate of a reaction, but do not change the free energy of a reaction. Enzymes frequently work in metabolic pathways, such that the activity of one enzyme can affect the activity of a second enzyme in the pathway by altering the concentration of a substrate or product of the second enzyme. Enzymes will alter the equilibrium of a reaction such that the enzyme increases the exergonic reaction relative to the endergonic reaction. Even if the enzyme forms a bond with a substrate during a reaction, the enzyme returns to its original form at the end of the reaction.
Which of the following statements are correct about how enzymes accelerate chemical reactions (select all that apply)? A. Enzymes bind substrates to raise their effective concentration B. Enzymes enhance the rate of a chemical reaction C. Enzymes catalyze chemical reactions by destabilizing transition states D. Side chains of protein provide reactive groups that facilitate reaction E. Enzymes shift the equilibrium of a chemical reaction to favor product formation
Which of the following statements is NOT true? None of the other four answers (all are true) The energy required to cause a chemical reaction to occur is called the activation energy Decomposition (degradation, catabolic) reactions are usually endergonic Chemical reactions in living cells are catalyzed by enzymes Enzymes increase the probability that a chemical reaction will take place by lowering the activation energy
Which of the following statements are incorrect? Enzymes and inorganic catalysts speed up reactions. Enzymes and inorganic catalysts are non-specific. Enzymatic activity can be regulated. Enzymes undo allosteric change and inorganic catalysts cannot.
The active site _______________. a. is the compound that an enzyme reacts with during the chemical reaction.b. is where the reactants bind.c. is another term for “substrate.”d. is the term for an enzyme that has returned to its original state after achemical reaction.
Which of the following statements about enzyme function is FALSE? Enzymes change shape permanently after a reaction, and can’t be re-used. Enzymes are types of proteins. Enzymes are highly specific molecules. Enzymes lower the activation energy of a reaction. Enzymes bind to substrates a an area called the “active site."
Homeostasis is important for all of the functions of the human body. Why is maintaining homeostasis important for enzymes? Group of answer choices: To maintain their normal structure and function To prevent substrate from binding to the enzyme To allow the substrate to bind forever To cause the enzyme to fold differently for each reaction
Enzymes are not used up in chemical reactions, so what exactly does an enzyme do? Refer to activation energy (transition state etc)
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.
Which of the following statements is not true about enzymes?* A. Enzymes are biological catalysts B. Enzymes as catalysts lowers the activation energy thus, speeds up the rate of reaction C. Enzymes are proteins D. Enzymes are highly specific E. None of the given options
Which of the following statements regarding enzymes is true? A. Enzymes decrease the free energy change of a reaction. B. Enzymes cjange the direction of chemical reaction. C. Enzymes prevent changes in substrate concentrations. D. Enzymes increase the rate of a reaction. E. Enzymes are permanently altered by the reactions they catalyze.