What can contamination of reagents leads to? Unreliable results Reliable results Reproducible results Good results Catalase is the enzyme found in potatoes and It decomposes hydrogen peroxide (H202) to form water and oxygen gas. H202 + catalase - ----> H2O + 02 +E. The reaction is maintained at temperature 40 degree Celsius and there was a formation of bubbles. Based on the enzymatic reaction given, What do you think is the substance responsible for the formation of bubbles? Oxygen gas Hydrogen gas no reaction, because the enzyme catalase will be deactivated no reaction, because the enzyme catalase will be denatured Other: Based on the Fehling's test video, do you think the sugars ribose (in RNA) and the deoxyribose (in DNA) will both form a positive result (red precipitate) No Yes

|回|回|回一回|日 https://bbhosted.cuny.edu/webapps/assessment/take/launch.jsp?course assessment id3 2032637_1&course Remaining Time: 1 hour, 27 minutes, 03 seconds. * Question Completion Status: QUESTION 5 Which of the following statements about a catalyst is true? O Catalysts increase the rate of the reaction. O Catalysts increase the activation energy of a reaction. O Catalysts decrease the rate of the reaction. O Catalysts cause a system at equilibrium to shift towards the reactants. O Catalysts cause a system at equilibrium to shift towards the products. QUESTION 6 What is the hydronium (H2O*) concentration of a solution with a pH of 5.16? Click Save and Submit to save and submit. Click Save All Answers to save all ansuwers. here to search DELL

Methyl salicylate has the odor of oil of wintergreen. This ester is prepared by the Fisher esterification of salicylic acid with methanol, shown here: HSO, OH * CH,OH OCH, • H,0 +] OH OH Use the dropdowns below to indicate the order of the steps that occur in this reaction mechanism to transform salicylic acid into methyl salicylate. Step 1 [ Choose (Choose Step 2 Protonation of the C-O oxygen atom Step 3 Proton transfer to neutralize the product Reforming of the CHOand loss of the leaving group Step 4 Proton transferts the OH group on the tetrahedral intermediate Attack of the methanol on the carbon of the C-O Step 6 Breaking of the pi bond to push eléctrons onto exygeri nd form the tetrahedial intermedian

Identify the stages of initiation, propagation, delay, inhibition, and termination in the following chain mechanism; If the stage does not exist, respond with a false, if it does exist, place a true. A. → B. + C A. + B. → P A2 → A. + A. A. + P→ B. Initiation: Propagation: Delay: Inhibition: Termination:

Attached is the basic model for an enzyme-catalyzed reaction. Assume that substrate binding is rate determining. Write the equations for the total amount of enzyme in the reaction and the rate of the reaction. Is A or B correct? If not, show work for the correct answer A :  [E] = [ES] + E  B :  [E] = [E]0 - [ES] ; r= k2 [E]0 S / kM + [E]