4. The activation energy, E of a reaction may be lowered by c. 'adding a catalyst a. increasing the temperature b. decreasing the temperature d. removing the products of the reaction
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- The function of enzymes is to:a. accelerate reactions to change the final resultb. produce otherwise non-existing reactionsc. stall reactions that would have happened otherwised. balance the pH in chemical reactionse. provide energy to biochemical reactionsAn atom that can donate electrons during a reaction is calleda. an oxidizing agentb. a reducing agentc. an ionic agentd. an electrolyteWhich form of the enzyme creatine kinase (CK) is sometimes used to measure tissue damage after a heart attack? Select one: O a. Octameric mitochondrial form of the creatine O b. MB cytosolic dimer form of the creatine O c. MM cytosolic dimer form of the creatine O d. BB cytosolic dimer form of the creatine Jump to.. - (Log out)
- 4. A group of students is conducting a lab investigation on a chemical reaction. An enzyme is present during the chemical change, and the reaction rate is recorded at various temperatures. Their results are graphed below. What would be the most likely explanation of these results? @ The investigation was flawed and should be repeated. B The reaction is complete. © The enzyme was removed from the reaction. D The enzyme began to lose the ability to function at higher temperatures. temperature reaction rateWhich of the statement is true regarding equilibrium? The rate of the forward reaction exceeds the rate of the reverse reaction The concentration of the reactants and the concentration of the products remains constant The value of equilibrium constant will change if a catalyst is present O Increasing the concentration of reactants increase the equilibrium constant8. An enzyme has the ability to catalyze reactions of several unrelated compounds. The mechanism of how this enzyme operates is best explained by Oa. the lock-and-key theory Ob. the induced-fit theory Oc. the enzyme-substrate complex Od. the efficiency of the enzyme
- 2. Figure 2 illustrates the different between uncatalyzed reaction and catalyzed reaction. Find the following that represents the lowering of the activation energy for catalyzed reaction. * > P AG Q Reactant > R Products Reaction Coordinate Figure 2 A. P--> Q B. P- R C. Q-> R D. Q- S14.Which explanation best fits the graph for pH's effect on an enzyme? Opri p O A. As the pH gets closer to neutral more H-Bonds are broken B. Larger numbers of H+ & OH- ions distort the active site O C. Low pHs cause more H-Bonds to happen near the active site O D. There are more collisions between substrates and active sites near the optimal pH Rate of Ey Aey9. For the graph below, which arrow indicates the ACTIVATION ENERGY for an ENZYME CATYLIZED reaction? reactants e.g. CO, + H,O products H,CO, Reaction coordinate O A B. C. Energy
- A chemical reaction has a Q10 of 3. Which rates characterize this reaction? a A rate of 9 at 40°C and 3 at 20°C b A rate of 6 at 30°C and 2 at 20°C c A rate of 12 at 10°C and 15 at 20°C d A rate of 6 at 20°C and 2 at 30°C e A rate of 9 at 20°C and 3 at 40°Con Which of the following statements about enzymes is CORRECT? Select one:* O A. Enzymes slow down chemical reactions so that they occur properly O B. Enyzmes are carbohydrates OC. Enzymes are specific for their substrate O D. Enzymes cannot be reused A substrate is: Select one: O A. A molecule that dissolves in a solvent O B. The molecule an enzyme acts on OC. A dissolving substance in a solution а a L O D6. Define: Energy of activation (EA) and tell how enzymes change it. 7. Identify a, b, c, d and e for the Reactions A+B C+D Or C+D A+B C. b. A+B a. е. a. d. C. C+D d. Progress of the Reaction e. Free Energy b.