7. The active site model (also called the lock and key model)of enzyme-substrat binding differs from the induced fit model in which of the following ways? A. The induced fit model holds that the shape of the substrate is irrelevant to enzyme-substrate binding B. The induced fit model holds that the shape of the active site is altered during the course of substrate binding C. The induced fit model holds that the shape of the active site is permanently altered by substrate binding D. The induced fit model holds that enzyme-substrate binding does not take place at the enzyme's active site 8. Which of the following enzyme types catalyzes the formation of a single bond between two substrates? A. Ligase B. Oxidoreductase C. Isomerase D. Hydrolase 9. Enzymes undergo a decrease in catalytic efficiency in the presence of excess temperature, but can regain this efficiency once temperature returns to normal: this suggests that increased temperature does not disrupt which of the aspects of enzyme structure? A. Peptide bonds B. Van der Waal's forces C. Hydrophobic interactions D. Hydrogen bonds 10. Local conditions can affect the specificity of an enzyme for its substrate, and thus the enzymes catalytic ability:which of the following alterations would most likely not affect an enzyme in this manner? A. Increased temperature B. Increased concentration of H+ C. Increased substrate concentration D. Increased concentration of salts 11. Enzymes catalyze biochemical reactions by altering which of the following quantities associated with the reaction? A. The change in Gibb's free energy Delta G B. The equilibrium constant k_(eq) C. The enthalpy of formation Delta H D. The activation energy E_(a) 12. Potassium cyanide is a poison which combines with cytochrome to prevent binding of oxygen to the enzyme without altering the Km of the reaction with respect to reduced cytochrome C. Which type of inhibition does this represent? A. Noncompetitive inhibition B inhibition produces glucose-phosphate. G-6-P itself can also C. Competitive inhibition

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7. The active site model (also called the lock and key model)of enzyme-substrat binding differs from the induced fit model in which of the following ways? A. The induced fit model holds that the shape of the substrate is irrelevant to enzyme-substrate binding B. The induced fit model holds that the shape of the active site is altered during the course of substrate binding C. The induced fit model holds that the shape of the active site is permanently altered by substrate binding D. The induced fit model holds that enzyme-substrate binding does not take place at the enzyme's active site 8. Which of the following enzyme types catalyzes the formation of a single bond between two substrates? A. Ligase B. Oxidoreductase C. Isomerase D. Hydrolase 9. Enzymes undergo a decrease in catalytic efficiency in the presence of excess temperature, but can regain this efficiency once temperature returns to normal: this suggests that increased temperature does not disrupt which of the aspects of enzyme structure? A. Peptide bonds B. Van der Waal's forces C. Hydrophobic interactions D. Hydrogen bonds 10. Local conditions can affect the specificity of an enzyme for its substrate, and thus the enzymes catalytic ability:which of the following alterations would most likely not affect an enzyme in this manner? A. Increased temperature B. Increased concentration of H+ C. Increased substrate concentration D. Increased concentration of salts 11. Enzymes catalyze biochemical reactions by altering which of the following quantities associated with the reaction? A. The change in Gibb's free energy Delta G B. The equilibrium constant k_(eq) C. The enthalpy of formation Delta H D. The activation energy E_(a) 12. Potassium cyanide is a poison which combines with cytochrome to prevent binding of oxygen to the enzyme without altering the Km of the reaction with respect to reduced cytochrome C. Which type of inhibition does this represent? A. Noncompetitive inhibition B inhibition produces glucose-phosphate. G-6-P itself can also C. Competitive inhibition

Answer 1

7. The active site model (also called the lock and key model) of enzyme-substrate binding differs from the induced fit model in which of the following ways? B. The induced fit model holds that the shape of the active site is altered during the course of substrate binding 8. Which of the following enzyme types catalyzes the formation of a single bond between two substrates? A. Ligase 9. Enzymes undergo a decrease in catalytic efficiency in the presence of excess temperature, but can regain this efficiency once temperature returns to normal: this suggests that temperature does not disrupt which of the following aspects of enzyme structure? A. Peptide bonds 10. Local conditions can affect the specificity of an enzyme for its substrate, and thus the enzymes catalytic ability: which of the following alterations would most likely not affect an enzyme in this manner? C. Increased substrate concentration 11. Enzymes catalyze biochemical reactions by altering which of the following quantities associated with the reaction? D. The activation energy $E_{a}$ 12. Potassium cyanide is a poison which combines with cytochrome to prevent binding of oxygen to the enzyme altering the Km of the reaction with respect to reduced cytochrome C. Which type of inhibition does this represent? A. Noncompetitive inhibition

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