因为是研究者主动改变温度来观察对酶活性(因变量)的影响。选项A结果和选项B成果在这里不符合变量的概念;选项D因变量是受自变量影响而变化的,这里温度是自变量不是因变量。本题考查实验变量概念,词汇有“enzyme activity(酶活性)”,语法为简单的主系表结构。
As the temperature of an enzyme decreases, the kinetic energy of the enzyme decreases. This can freeze or stop the rate of reaction. What happens to enzyme activity when temperatures are too high? As the temperature of an enzyme increases, the internal energy of the enzyme also increases. Thi...
Temperature Effects in Enzyme ActivityThe Effects of Temperature
温度对酶活性的影响enzyme activity BiochemistryPractical 2)a)Theeffectsoftemperature,ontheenzymeactivity Investigatetheeffectoftemperatureonamylaseactivity Next 1 Materialsrequired 1.Waterbath2.Stirrer3.LaboratoryThermometer4.Beaker5.Measuringcylinder6.Boilingtube7.Stopwatch8.Starchsolution(2mg/ml)9.Amylase...
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This lesson addresses how temperature influences enzyme function, and provides a concrete example from a lab setting. The key terminology will include the words enzyme, catalase, denaturing, and reaction rate. Enzymes & Catalase Meet Mr. Corsini. He's a science teacher and one of the highlights...
A method for thermally induced switching of enzyme activity has been developed, based on the site-directed conjugation of end-reactive temperature-responsive polymers to a unique cysteine (Cys) residue positioned near the enzyme active site. The reversible temperature-induced collapse of N,N-dimethylac...
Temperature, substrate concentration, and pH are three factors that can affect enzyme activity. Enzymes are catalysts -- substances that increase the rates of reactions. Without them, many essential processes, such as digestion, would occur too slowly for life to continue. Many enzymes have an ...
An enzyme exhibits maximum activity over the narrow pH range in which a molecule exists in its properly charged form. The median value of this pH range is called the optimum pH of the enzyme (part (b) of Figure 18.14 “Temperature and pH versus Concentration”). With the notable exception...
There is increasing evidence that the temperature dependence of many enzyme-catalysed reactions does not follow simple (linear) Arrhenius behaviour, but rather shows significant curvature, passing through a temperature of optimal activity (Topt). Such a behaviour is accounted for by Macromolecular Rate...