14) If you performed a similar experiment to test the effects of pH on the activity of the enzyme pepsin, what would you predict to be optimal pH of pepsin? Why?
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- 1. The enzymes of the digestive system are classified as hydrolases. What does this mean?Which of the following statements about inhibition is true? a. Allosteric inhibitors and allosteric activators are competitive for a given enzyme. b. If an inhibitor binds the active site, it is considered noncompetitive. c. If an inhibitor binds to a site other than the active site, this competitive inhibition. d. A noncompetitive inhibitor is believed to change the shape of the enzyme, making its active site inoperable. e. Competitive inhibition is usually not reversible.In an enzymatic reaction: a. the enzyme leaves the reaction chemically unchanged. b. if the enzyme molecules approach maximal rate, and the substrate is continually increased, the rate of the reaction does not reach saturation. c. in the stomach, enzymes would have an optimal activity at a neutral pH. d. increasing temperature above the optimal value slows the reaction rate. e. the least important level of organization for an enzyme is its tertiary structure.
- 4. a. Use the data in the graph above to estimate a KM value for the enzyme in the presence of these metabolites, and enter them into the table below. b. Classify these metabolites as either activators or inhibitors, and explain your rationale below.Enzyme 1 has peak activity at pH 2.4 and Enzyme 2 has a peak activity at pH 8.4. Which of the following choices correctly identifies the two enzymes? A) 1- pepsin; 2- lingual lipase B) 1 - pepsin; 2 - carboxypeptidase C) 1 - trypsin; 2 - aminopeptidase D) 1- trypsin; 2 - amylase E) 1- trypsin; 2- pepsin1. The concentration of substrate X is high. What happens to the rate of the enzyme-catalyzed reaction if the concentration of substrate X is reduced? Explain. 2. An enzyme has an optimum pH of 7.2. What is most likely to happen to the activity of the enzyme if the pH drops to 6.2? Explain
- 1. What is the difference between ketogenic and glucagenic amino acids? 2. What is the difference between transamination and oxidative deamination?Item 35 Organic cofactors are referred to as _________. Fill in the blank 36 Item 36 Noncompetitive inhibition of an enzyme occurs when the inhibitor binds to the Multiple Choice a. allosteric site, and its effectiveness is not influenced by substrate concentration. b. allosteric site, and its effectiveness depends on substrate concentration. c. active site, and its effectiveness is not influenced by substrate concentration. d. active site, and its effectiveness depends on substrate concentration. e.substrate, and its effectiveness depends on product concentration.The average pH of the human stomach is 1.5 to 3.5. Based on the information from the graph, predict which enzyme is most likely to be found in the stomach? Provide evidence for your choice.
- Suppose you have a test tube containing olive oil and pancreatic lipase in a pH 7.0 buffer incubating at 37°C for 1 hour. a) Identify two different observations or measurements you can make in order to determine whether digestion of the oil occurred. b) Do you think digestion occurs under these conditions? What could have made digestion more efficient?It has been stated many times that fatty acids cannot yield a net gain in carbohydrates. Why can odd-chain fatty acids be thought to break this rule to a small extent?1. There are two major categories of enzyme, inhibition, name, and describe them.  1a. Reverse inhibition can be overcome to allow the enzyme to resume is Catley activities. Describe how reversible inhibition can occur and how it can be over come.