Enzyme Controlled Reactions Worksheet Protected View-Saved to this PC Review Vie
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Enzyme Controlled Reactions Worksheet Protected View-Saved to this PC Review View Help OTell me what you want to do Unless you need to edit, it's safer to stay in Protected View. Enable Editing Virtual Lab: Enzyme Controlled Reactions Worksheet 1. Which of the following does NOT apply to an enzyme: a. Catalyst b. Inorganic c. Proteirn d. All of the above apply to an enzyme 2. When an enzyme catalyzes a reaction: a. Substrate(s) bind in the active site b. Products bind in the active site c. The shape of the enzyme remains unchanged d. The enzyme is consumed by the reaction Which of the following would interfere most with the ability of an enzyme to catalyze a reaction? 3. a. Reduced concentration of substrate available b. Reduced concentration of product available c. Increased concentration of substrate available d. A change in the pH 4. Feedback mechanisms regulate the rate of enzyme activity, effectively "turning off' an enzyme in a reversible way until more product is needed. Which of the following would be most effective as a feedback mechanism? a. Reduced concentration of product b. Increased concentration of substrate c. A change in pH d. Temporary binding of a non-substrate molecule in the active site Which of the following statements is accurate in describing the activity of the lactase enzyme? 5. a. Lactase can function equally effectively at many different pH levels b. The shape of lactase does not change during the reaction c. Lactase is converted to glucose and galactose by the reaction d. One lactase enzyme can catalyze many reactionsExplanation / Answer
1 b.Inorganic
2 a.substrates bind in the active site.
3 d.a change in the pH.
4 d.Temporary binding of a non-substrate molecule in the active site.
5 d.one lactase enzyme can catalyze many reactions
6.aCatabolic – is the set of metabolic pathways that breaks down molecules into smaller units to release energy.
b.Anabolic – is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy
c.Endergonic –accompanied by or requiring the absorption of energy, the products being of greater free energy than the reactants.
d.Exergonic - accompanied by the release of energy.
7.a.anabolic
b.endergonic
8No,catabolic and exergonic is the action of lactase.
9.enzyme specificity - that is, the enzyme's ability to bind only the correct substrates - comes from having a shape that is nearly perfect for one particular type of molecule. In that sense, the substrate fitting into the enzyme is like a key fitting into a lock.The analogy isn't perfect because the enzyme actually has the highest binding affinity - that is, the best fit - not for the substrate, but for the closely related intermediate transition state the substrate takes when it is half way through its reaction.
Table 1
Amount of substrate pH3 pH5 pH7 pH9 pH11
lactase
0.5g 19 39 72 45 24
1.0g 39 81 145 91 49
2.0g 82 168 300 189 103
4.0g 96 198 350 223 121
8.0g 96 198 350 223 121
10.The substrate amount required to achieve maximum reaction was 4.0 g
11.At a pH 7 the maximum reaction rate occured.
12.Equilibrium was oversaturated and more enzymes would be needed to see and increase.
13.pH 7 represented by the green line.
pH 7 for lactase enzyme activity.
14.independent variable..pH
dependent variable..number of molecule of product formed per minute.
14.Add more enzyme because then we can add more substrated and temprature.
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