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Effects of ph on enzyme catalysed reactions
Effects of temperature on enzymes
Effects of temperature on enzymes
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Laboratory 6: Lactase Enzyme Lab Report Introduction Enzymes are types of proteins that work as a substance to help speed up a chemical reaction (Madar & Windelspecht, 104). There are three factors that help enzyme activity increase in speed. The three factors that speed up the activity of enzymes are concentration, an increase in temperature, and a preferred pH environment. Whether or not the reaction continues to move forward is not up to the enzyme, instead the reaction is dependent on a reaction’s free energy. These enzymatic reactions have reactants referred to as substrates. Enzymes do much more than create substrates; enzymes actually work with the substrate in a reaction (Madar &Windelspecht, 106). For reactions in a cell it is important that a specific enzyme is present during the process. For example, lactase must be able to collaborate with lactose in order to break it down (Madar & Windelspecht, 105). Lactase, a type of enzyme usually found in the small intestine, breaks down lactose into sugars such as galactose and glucose. People that are lactose intolerant cannot consume anything containing dairy because they cannot break down lactose, a sugar found in milk. Those that are lactose intolerant lack the enzyme lactase. Without lactase, the body does not have the ability to break down lactose, which leads to a person having an upset stomach and diarrhea. Adults are more likely to be lactose intolerant than children because of the metabolic change in the body (Dritsas). The lack of lactase that people have can be compensated by taking pills to help break down lactose that is consumed; with the help of a lactase pill the body can now absorb galactase and glucose properly (McCracken, 481). The purpose of the foll... ... middle of paper ... ...remain the same at 4ºC and 25ºC. The final result of this experiment was that glucose was more present in environments of higher temperatures. Our hypothesis and predictions were wrong because lower temperatures do not break down the enzymes because they become denatured. The enzyme activity decreases once the temperature decreases, as well. Enzyme activity increases when there is a rise in temperature, which is why lactose is broken down in much higher temperatures, resulting in a high presence of glucose. References Dritsas, Lawrence. (2013). Physiology and the Dairy Market. Financial Times, 1: 10. McCracken, Robert D. (1971). Lactase Deficiency: An Example of Dietary Evolution. Current Anthropology, 12(4-5): 481. Madar, Sylvia S., & Windelspecht, Michael. (2014). Inquiry into Life, Metabolism: Energy & Enzymes (pp. 104-107). New York: McGraw Hill.
After conducting this experiment and collecting the data I would have to say that the optimal temperature for enzyme activity would have to be room temperature which in my experiment was thirty-four degrees Celsius. I came to this answer because the glucose test strip showed that at room temperature there was more glucose concentration that at either of the other temperatures. Due to temperature extremes in the boiling water the enzymes could no longer function because the breakdown of lactose stopped. The cold water also hindered the breakdown of the lactose but as the water warmed the enzymes were more active which can be seen in the results for the cold water at 20 minutes B. Describe the relationship between pH and the enzymatic activity of lactase.
The affects of pH, temperature, and salt concentration on the enzyme lactase were all expected to have an effect on enzymatic activity, compared to an untreated 25oC control. The reactions incubated at 37oC were hypothesized to increase the enzymatic activity, because it is normal human body temperature. This hypothesis was supported by the results. The reaction incubated to 60oC was expected to decrease the enzymatic activity, because it is much higher than normal body temperature, however this hypothesis was not supported. When incubated to 0oC, the reaction rate was hypothesized to decrease, and according to the results the hypothesis was supported. Both in low and high pH, the reaction rate was hypothesized to decrease, which was also supported by the results. Lastly, the reaction rate was hypothesized to decrease in a higher salt concentration, which was also supported by the results.
One of the most primitive actions known is the consumption of lactose, (milk), from the mother after birth. Mammals have an innate predisposition towards this consumption, as it is their main source of energy. Most mammals lose the ability to digest lactose shortly after their birth. The ability to digest lactose is determined by the presence of an enzyme called lactase, which is found in the lining of the small intestine. An enzyme is a small molecule or group of molecules that act as a catalyst (catalyst being defined as a molecule that binds to the original reactant and lowers the amount of energy needed to break apart the original molecule to obtain energy) in breaking apart the lactose molecule. In mammals, the lactase enzyme is present
Enzymes are biomolecules that catalyze or assist chemical reactions. ("Enzyme Information - Disabled World", n.d.,) Without enzymes it would be impossible for an organism to carry out chemical reactions. Enzymes are proteins that carry a chemical reaction for a specific substance or nutrient. For example, the digestive enzymes help food to be broken down so it can be absorbed. Enzymes can either initiate the reaction or speed it up. Substrates are the chemicals that are transformed by enzymes. (Gunsch & Foster, 2014) Reactants are the chemicals in the absence of enzymes. Metabolic pathways that occur in a cell are determined by a set of enzymes which are selective for their substrates and catalyze only a few reactions among the many possibilities.
LI was first recognized in the 1960s when researchers found black children responding unfavorably to milk in their diets (Harrison 812). Research led to the discovery that lactose, the major sugar in milk and related dairy products, was undigestible in some people because they were missing the enzyme lactase. Lactase breaks down lactose into its component monosaccharide sugars, glucose and galactose. In people missing lactase, lactose passes undigested through the small intestine. In some people, the undigested lactose passes through the remainder of their systems with no ill effects. In others, however, the undigested lactose becomes viscous and ferments in the colon (Englert and Guillory 903). The thickness of the liquid and the fermentation cause painful cramping, gas and sometimes diarrhea. Besides not being able to digest lactose, these people suffer from malabsorption, which causes them to receive little or none of milk's nutrients (Houts 110).1
needed to activate the reacting molecules. They are specific that usually act on only one type of substrate, so each of them just. perform one particular reaction. Furthermore, only a small amount of enzyme is needed every time to speed up a reaction. Enzymes are globular proteins that have a precise three-dimensional structure.
The enzymes have active sites on their surfaces to allow the binding of a substrate through the help of coenzymes to form enzyme-substrate complex. The chemical reaction thus converts the substrate to a new product then released and the catalytic cycle proceeds.
The results of this experiment showed a specific pattern. As the temperature increased, the absorbance recorded by the spectrophotometer increased indicating that the activity of peroxidase enzyme has increased.At 4C the absorbance was low indicating a low peroxidase activity or reaction rate. At 23C the absorbance increased indicating an increase in peroxidase activity. At 32C the absorbance reached its maximum indicating that peroxidase activity reached its highest value and so 32 C could be considered as the optimum temperature of peroxidase enzyme. Yet as the temperature increased up to 60C, the absorbance decreased greatly indicating that peroxidase activity has decreased. This happened because at low temperature such as 4 C the kinetic energy of both enzyme and substrate molecules was low so they moved very slowly, collided less frequently and formed less enzyme-substrate complexes and so little or no products. Yet, at 23 C, as the temperature increased, enzyme and substrate molecules
Enzymes work by lowering the activation energy required by molecules to start the reaction off. Enzymes also react (reversibly) with substrates (The molecule(s) that the enzyme is catalysing) this is done by forming Enzyme-substrate complex, which is then broken down into products. As well as being affected by temperature and pH enzymes optimum rate of reaction is also changed by competitive and non competitive inhibitors. Competitive inhibitors inhibit the enzyme so that enzyme-substrate complex’s cant form until it’s unblocked or there is a change in concentration in substrate, this means it takes longer to reach the optimum rate of reaction.
The mixture for that table’s flask was 15 mL Sucrose, 10 mL of RO water and 10 mL of Yeast, which the flask was then placed in an incubator at 37 degrees Celsius. In my hypothesis for comparison #4 the measurements would go up again with every 15 min. intervals because of the high tempeture and also be higher that then Controlled Table’s measurements. Hypothesis was right for the first part but was wrong for the second part of the comparison, the measurements did increase in the table’s personal flask but the measurements did not get higher than the Controlled Table’s measurements, see chart below. In conclusion, I feel that the substitution of glucose for sucrose made the enzymes work just as hard as the Controlled Table’s flask but just not as much because sucrose was too strong for the enzymes to
In this lab, it was determined how the rate of an enzyme-catalyzed reaction is affected by physical factors such as enzyme concentration, temperature, and substrate concentration affect. The question of what factors influence enzyme activity can be answered by the results of peroxidase activity and its relation to temperature and whether or not hydroxylamine causes a reaction change with enzyme activity. An enzyme is a protein produced by a living organism that serves as a biological catalyst. A catalyst is a substance that speeds up the rate of a chemical reaction and does so by lowering the activation energy of a reaction. With that energy reactants are brought together so that products can be formed.
In 1985, scholars S. Boyd Eaton and Melvin J. Konner published a paper in the New England Journal of Medicine entitled ‘Paleolithic Nutrition’ that provided insight to he evolution of human nutritional requirements. Although...
Purpose: The purpose of this lab is to explore the different factors which effect enzyme activity and the rates of reaction, such as particle size and temperature.
However, the decrease varied depending on the temperature. The lowest temperature, 4 degrees Celsius, experienced a very low decrease of amylose percentage. Temperature at 22 degrees Celsius and 37 degrees Celsius, both had a drastic decrease in amylose percentage. While the highest temperature, 70 degrees Celsius, experienced an increase of amylose percentage. In conclusion, as the temperature increases the percentage of amylose decreases; however, if the temperature gets too high the percentage of amylose will begin to increase. The percentage of amylose increases at high temperatures because there is less enzyme activity at high temperatures. However, when the temperature is lower, more enzyme activity will be present, which results in the decrease of amylose percentage. This is why there is a decrease of amylose percentage in 4, 22, and 37 degrees Celsius. In this experiment the optimal temperature is 37 degrees Celsius, this is because this is the average human body temperature. Therefore, amylase works better at temperatures it is familiar
Enzymes are protein molecules that are made by organisms to catalyze reactions. Typically, enzymes speed up the rate of the reaction within cells. Enzymes are primarily important to living organisms because they help with metabolism and the digestive system. For example, enzymes can break larger molecules into smaller molecules to help the body absorb the smaller molecules faster. In addition, some enzyme molecules bind molecules together.