2022-23CTB賽制和流程更新，火熱報名組隊中！
關(guān)注社科實踐活動的家長和同學(xué)對CTB應(yīng)該并不陌生。全球青年研究創(chuàng)新論壇CTB，由哈佛商學(xué)院和清華大學(xué)經(jīng)管學(xué)院學(xué)者聯(lián)合啟動，旨在讓中國青年心懷家國立足身邊，提出原創(chuàng)本土解決方案，在世界舞臺發(fā)聲。 CTB 2022-2...
OCR A Level Biology:復(fù)習(xí)筆記2.4.9 Practical: Measuring Enzyme Activity
Practical: Measuring Enzyme Activity The?progress?of?enzyme-catalysed reactions?can be investigated by: Measuring the?rate of formation of a product Measuring the?rate of disappearance of a substra...
OCR A Level Biology:復(fù)習(xí)筆記2.4.8 Coenzymes, Cofactors & Prosthetic Groups
Coenzymes, Cofactors & Prosthetic Groups There are substances?other than?substrates and inhibitors that?interact?with?enzymes Some enzymes can only?function properly?if another?non-protein subs...
OCR A Level Biology:復(fù)習(xí)筆記2.4.7 Enzyme Activity: Enzyme Inhibitors
Enzyme Inhibitors Reversible inhibitors An enzyme's activity can be reduced or stopped,?temporarily, by a?reversible inhibitor There are?two types?of reversible inhibitors: Competitive?inhibitors h...
OCR A Level Biology:復(fù)習(xí)筆記2.4.6 Enzyme Activity: Substrate Concentration
Enzyme Activity: Substrate Concentration The?greater?the?substrate concentration, the?higher?the?rate of reaction: As the number of substrate molecules increases, the likelihood of enzyme-substrate...
OCR A Level Biology:復(fù)習(xí)筆記2.4.5 Enzyme Activity: Enzyme Concentration
Enzyme Activity: 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 a...
OCR A Level Biology:復(fù)習(xí)筆記2.4.4 Enzyme Activity: Temperature
Enzyme Activity: Temperature Enzymes have a specific?optimum temperature This is the temperature at which they catalyse a reaction at the?maximum rate Lower temperatures?either?prevent?react...
哈佛和耶魯大學(xué)法學(xué)院主動退出U.S. News排名！
哈佛大學(xué)、耶魯大學(xué)的法學(xué)院宣布? 退出U.S. News法學(xué)院的年度排名? 為什么兩所頂尖美國名校要做出這個決定？ 是否對U.S. News排名“權(quán)威”形成一種挑戰(zhàn)？ 耶魯大學(xué)：稱霸32年，排名存在缺陷 耶魯大學(xué)法學(xué)院院長Heat...
OCR A Level Biology:復(fù)習(xí)筆記2.4.3 Enzyme Activity: pH
Enzyme Activity: 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...
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.4 Enzymes & Temperature: Extended
CIE IGCSE Biology: 復(fù)習(xí)筆記：5.1.4 Enzymes & Temperature: Extended Enzymes & Temperature: Extended Enzymes are?proteins?and have a?specific shape, held in place by?bonds This is extremely i...
OCR A Level Biology:復(fù)習(xí)筆記2.4.2 Enzyme Action
Mechanism 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 substra...
OCR A Level Biology:復(fù)習(xí)筆記2.4.1 The Role of Enzymes
Enzymes as Catalysts 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 ...
