Question : 1.Which of the following statements concerning enzymes FALSE? A) Enzymes the : 1318500

1.Which of the following statements concerning enzymes is FALSE?

A) Enzymes are the body’s biological catalysts, increasing the rate of cellular reactions.

B) Enzymes are usually globular proteins with flexible three-dimensional shapes.

C) The reactant in an enzyme-catalyzed reaction is called a cofactor.

D) The active site of an enzyme is where substrate binding and catalysis occur.

E) Inhibitors are molecules that cause an enzyme to lose its activity.

 

2.The diagram below shows the energy pathway of an uncatalyzed reaction. How does the energy diagram change when an enzyme is used in the same reaction?

A) The energy of the products decreases.

B) The energy of the reactants increases.

C) The energy of the reactants decreases.

D) The activation energy decreases.

E) The energy of the reactants becomes equal to the energy of the products.

 

3.The rate of an enzyme-catalyzed reaction initially increases with an increase in the substrate concentration, but eventually reaches a maximum value, even though the concentration of substrate continues to increase.  Which of the following best explains why?

A) As substrate concentration increases, the substrates preferentially bind with each other instead of the active site of the enzyme, and no additional catalysis occurs.

B) As substrate concentration increases, the active sites of all the enzyme molecules become occupied with substrate molecules, and no additional binding can occur.

C) An increase in substrate concentration eventually increases the temperature of the reaction mixture, and the enzyme becomes denatured.

D) An increase in substrate concentration allows for greater competition between substrate and inhibitor binding, and enzyme activity ceases.

E) When substrate concentrations become too high, local variations of pH occur that cause the enzyme to become denatured.

 

4.Sucrase is an example of an enzyme that displays absolute specificity.  What does the term “absolute specificity” indicate about an enzyme?

A) It catalyzes the reaction of only a single substrate.

B) It catalyzes the reaction of only one class of compounds.

C) It catalyzes one type of reaction for the same class of compounds.

D) It catalyzes the reaction of only a single enantiomer of a compound.

E) It catalyzes the reaction of only a single type of bond.

 

5.The pancreatic enzymes trypsin, chymotrypsin, and elastase all hydrolyze peptide bonds on the carbonyl side of several different amino acids in a protein. What term best describes their enzyme specificity?

A) stereospecific

B) peptide

C) absolute

D) linkage

E) group

 

6.Which of the following describes how an enzyme can affect the transition state in an enzyme-catalyzed reaction?

A) by modifying the local pH by accepting or donating H+ ions

B) by placing stress on a bond in the substrate, making it easier to break

C) by bringing two reactants together in close proximity and in a suitable orientation for reaction

D) None of the above.

E) All of the above.

 

7.What term describes the pH at which an individual enzyme functions best?

A) isoelectric pH

B) pH optimum

C) physiological pH

D) neutral pH

E) zwitterion pH

 

8.What is an allosteric enzyme?

A) an enzyme whose activity is regulated by the binding of a small effector molecule

B) the inactive form of an enzyme

C) an enzyme that has become denatured and can no longer catalyze reactions

D) an enzyme that is bound to an inhibitor molecule

E) an enzyme that catalyzes reactions in plants and animals, but not humans

 

9.In feedback inhibition of an enzyme-catalyzed biosynthetic pathway, what frequently serves as the negative allosteric effector?

A) the starting material of the pathway

B) acetylcholine

C) oxygen

D) the final product of the pathway

E) temperature

 

10.Proteolytic digestive enzymes are often produced in an inactive form. What is the name that refers to the inactive form of an enzyme?

A) isozyme

B) zwitterion

C) proenzyme

D) inhibitor

E) allele

 

 

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