CIE A Level Biology復習筆記3.2.7 Enzyme Inhibitors
Enzyme Inhibitors An enzyme's activity can be reduced or stopped, temporarily, by a reversible inhibitor There are?two types?of reversible inhibitors: Competitive?inhibitors have a?similar shape?to...
澳洲AMC考試2022即將開賽，抓緊時間備賽！
相較于美國AMC，澳洲數學學術活動（澳洲AMC）對初次參加考試或者比賽的新生比較友好，澳洲3年級的小朋友就可以參加學術活動。澳洲AMC考試2022即將開賽！今天不如就讓我們一起來了解一下這項風靡全球的數學國際學...
CIE A Level Biology復習筆記3.2.6 Vmax & the Michaelis-Menten Constant
Vmax & the Michaelis-Menten Constant Substrate concentration?affects the?rate of catalysis?in an enzyme-substrate reaction When the substrate concentration is?fixed?(and enzyme concentration is...
CIE A Level Biology復習筆記3.2.5 Rate: Inhibitor Concentration
Rate: Inhibitor Concentration There are?two types?of inhibitors: Competitive?inhibitors have a?similar shape?to that of the?substrate?molecules and therefore?compete?with the substrate for the acti...
CIE A Level Biology復習筆記3.2.3 Rate: Enzyme Concentration
Rate: Enzyme Concentration Enzyme concentration affects the rate of reaction The?higher?the?enzyme concentration?in a reaction mixture, the?greater the number of active sites?available and the?grea...
CIE A Level Biology復習筆記3.2.2 Rate: pH
Rate: pH All enzymes have an?optimum pH?or a pH at which they operate best Enzymes are?denatured?at extremes of pH Hydrogen?and ionic bonds?hold the tertiary structure of the protein (ie. the enzym...
CIE A Level Biology復習筆記3.2.1 Rate: Temperature
Rate: Temperature Enzymes have a?specific optimum temperature?– the temperature at which they catalyse a reaction at the?maximum rate Lower temperatures?either?prevent?reactions from proceeding or?...
CIE A Level Biology復習筆記3.1.5 Colorimetry
Colorimetry to Measure Enzyme Activity A?colorimeter?is able to measure?light absorbance?(how much light is absorbed) or?light transmission?(how much light passes through) a substance Colorimetry c...
CIE A Level Biology復習筆記3.1.4 Measuring Enzyme Activity
Measuring Enzyme Activity The?progress?of?enzyme-catalysed reactions?can be investigated by: Measuring the?rate of formation of a product?using catalase Measuring the?rate of disappearance of a sub...
CIE A Level Biology復習筆記3.1.3 How Enzymes Work
How Enzymes Work The lock-and-key hypothesis Enzymes are?globular proteins This means their?shape?(as well as the shape of the?active site?of an enzyme) is determined by the complex tertiary struct...
CIE A Level Biology復習筆記3.1.2 Enzyme Action
Mode of Enzyme Action Enzymes have an?active site?where?specific substrates bind?forming an?enzyme-substrate complex The?active site?of an enzyme has a?specific shape?to fit a specific substrate Ex...
CIE A Level Biology復習筆記3.1.1 Enzymes
Enzymes as Proteins Enzymes are?biological catalysts ‘Biological’ because they function in?living systems ‘Catalysts’ because they?speed up the rate of chemical reactions?without being used up or c...
