哈佛和耶鲁大学法学院主动退出U.S. News排名！
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OCR A Level Biology:复习笔记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: 复习笔记：5.1.4 Enzymes & Temperature: Extended
CIE IGCSE Biology: 复习笔记：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:复习笔记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:复习笔记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 ...
OCR A Level Biology:复习笔记2.3.8 Translation
Translation Translation occurs in the cytoplasm of the cell After leaving the nucleus via a nuclear pore, the mRNA molecule attaches to a ribosome In the cytoplasm, there are free molecules of tRNA...
OCR A Level Biology:复习笔记2.3.7 Transcription
Transcription A gene is a sequence of nucleotide bases in a DNA molecule that codes for the production of a specific sequence of amino acids, that in turn make up a specific polypeptide (protein) T...
OCR A Level Biology:复习笔记2.3.6 The Genetic Code
Nature of the Genetic Code A gene is a sequence of nucleotides that forms part of a DNA molecule (one DNA molecule contains many genes) This sequence of nucleotides (the gene) codes for the product...
CIE IGCSE Biology: 复习笔记：5.1.3 Enzyme Action & Specificity: Extended
CIE IGCSE Biology: 复习笔记：5.1.3 Enzyme Action & Specificity: Extended Enzyme Action & Specificity: Extended Enzymes are specific to one particular substrate(s) as the active site of the ...
OCR A Level Biology:复习笔记2.3.5 DNA Replication
Semi-conservative Replication of DNA Before a (parent) cell divides, it needs to copy the DNA contained within it Doubling the DNA ensures that the two new (daughter) cells produced will both recei...
2022AMC10/12 B卷最新考情分析，预约获取AMC B卷中英试卷真题+答案+视频解析！
2022 AMC10/12 B卷今日落幕！ 同学们发挥得如何？ 与A卷对比后，难度是增是减了呢？ 翰林将尽快整理B卷的答案与解析 分析考试重难点和备考建议 并在静默期后第一时间发给大家 2022 AMC10/12 A+B卷（预约） 中英...
OCR A Level Biology:复习笔记2.3.4 DNA Purification
DNA Purification Practical investigations can be conducted to purify (isolate) DNA via the process of precipitation Isolating DNA from cells is an essential starting point for a huge range of other...
