After the lunch meal, a student felt that the digestion didn't go well. He decided to take some digestive enzyme tablet that helped the digestion. In Michaelis-Menten Equation, which term will be affected? 1.[S] 2. [E]o 3. Kcat ○ 4.Km 05.[1]
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After the lunch meal, a student felt that the digestion didn't go well. He decided to take some digestive enzyme tablet that helped the digestion. In Michaelis-Menten Equation, which term will be affected? 1.[S] 2. [E]o 3. Kcat ○ 4.Km 05.[1]
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- a. What is the name of metabolite 1? b. What enzyme converts metabolite 1 to metabolite 2 (E1)? c. What is the name of metabolite 2? d. What enzyme converts metabolite 4 to metabolite 5 (E4)? e. What cofactor, if any, would E4 require?The activity of pepsin was measured at various pH values. When the temperature and the concentrations of pepsin and substrate were held constant, the following activities were obtained: pH Activity 1.0 0.5 1.5 2.6 2.0 4.8 3.0 2.0 4.0 0.4 5.0 0.0 Predict the activity of pepsin in the blood at pH 7.4.The activity of pepsin was measured at various pH values. The temperature and the concentrations of pepsin and substrate were held constant. The following activities were obtained: pH activity 1.0 0.5 1.5 2.6 2.0 4.8 3.0 2.0 4.0 0.4 5.0 0.0 Plot a graph of the pH dependence of pepsin activity. Based on the graph what is the optimum pH? Predict the activity of pepsin in the blood at pH 7.4.
- Using the standard curve for the digestion of amylose producing maltose (Figure 13, Workshop 4 manual), determine the amount of maltose produced for each of the conditions (Tubes 2-10). Assume that these values are the amount of product (maltose) produced per unit time (e.g., mM per second) or enzyme velocity Absorbance (545 nm) Maltose (mM/sec) 0 0 0 0.040 0.210 0.330 0.295 0.280 0.202 0.030Two different preparations of the same enzyme are characterized below. Total protein (mg) Total activity (activity units) Step Volume Specific activity (ml) Preparation 1 300 1000 600,000 Preparation 2 200 1000 500,000 a) Fill in the 3 double-underlined blanks on the table below. b) Which of the 2 preparations would you think is likely to be more pure? Explain.The phosphate buffer (H2PO4 HPO42+ H") in esophageal cells has a pKa of 7.2. If acid floods into cells, and the pH drops from 7.2 to 3.2, which concentration in the cells will increase, H2PO4 or HPO42? Is pH 3.2 in the buffer range of this phosphate buffer (pKa 7.2)? Esophagus Stomach HPO42, no HPO4: yes H,PO4: yes H,PO41; no
- a. What is the name of metabolite 1? b. What is the name of metabolite 2? c. What kind of reaction occurred when 1 was converted to 2? d. What general kind of enzyme might you expect to perform this reaction? e. What cofactor, if any, would be required for this reaction?You digest the octapeptide Met-Glu-Arg- His-Met-Cys-Phe-Leu with trypsin, chymotrypsin and cyanogen bromide all in the same beaker. Which of the following correctly lists the isoelectric points for all of the fragments that are produced in your digest? Relevant pKa values are; 2.2, 4.3, 6.0, 8.3, 9.8 and 12.5. 5.3, 6.0, 6.0, 7.1, 7.9 3.3, 6.0, 6.0, 7.1, 7.9 5.3, 6.0, 6.0, 7.1, 7.9, 11.2 O 5.3, 6.0, 6.0, 7.1, 11.2 5.2, 5.3, 5.3, 7.1, 7.9The hydrolysis of a substrate, S, by an enzyme has been studied in the lab. The following initial rates, vo, were recorded at different concentrations. [S] (M) Vo (M/min) 2.10-10-4 1.20.10-6 4.20-10-4 3.10.10-6 9.30-10-4 6.30-10-6 1.42-10-3 9.10-10-6 A. Determine the rate constants for degradation of the substrate B. What is the rate of reaction at [S] = 1.1.104 M? C. Explain, why enzymes can make reactions go faster? Does enzymes also catalyse the reverse reaction from product to substrate?
- Write your correct observations and inferences/conclusions for each of the following: Digestion of Proteins Test Sample Observations Egg + Water + 0.1 M HCl Egg + 2% pepsin + 0.1 M HCl Egg + 2% pepsin + water A1. Identify the substrate(s), enzyme(s) and hydrolysis products in the digestion of protein. Represent your answer using a general chemical equation. A2. Why does a person with low production of stomach HCl will have difficulty in digesting proteins? A3. Name the sites and enzymes present that help digest proteins in our body?Consider the Michaelis-Menten enzymes below and answer the following questions. Kcat (s') 9.5*105 1.4*10* 2.5*102 1.0*107 5.0*10 8.0*10² Enzyme Km (M) A В a. Which enzyme has the highest affinity substrate? How do you know? b. Which enzyme can convert the most substrate to product in a given period of time? How do you know? c. Which enzyme has the highest catalytic efficiency? How do you know?The following data were collected in the study of a new enzyme and an inhibitor of the new enzyme: Vo (nmol/sec) [S] (µM). 1.3 - Inhibitor + Inhibitor 2.50 0.62 2.6 4.00 1.42 6.5 6.30 2.65 13.0 7.60 3.12 26.0 9.00 3.58 What is the Vmax of the inhibited enzyme reaction?