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...
OCR A Level Biology:复习笔记2.3.3 DNA: Structure
DNA Structure The nucleic acid DNA is a polynucleotide – it is made up of many nucleotides bonded together in a long chain A DNA nucleotide DNA molecules are made up of two polynucleotide st...
OCR A Level Biology:复习笔记2.3.2 Phosphorylated Nucleotides
Structure of ATP & ADP All organisms require a constant supply of energy to maintain their cells and stay alive In all organisms this energy is required for: Anabolic reactions (building larger...
OCR A Level Biology:复习笔记2.3.1 Nucleotides & Phosphodiester Bonds
Nucleotides DNA and RNA are nucleic acids: polymers that are made up of many repeating units (monomers) called nucleotides Each nucleotide is formed from: A pentose sugar (a sugar with 5 carbon ato...
2022AMC12 A卷答案及分数线预测，真题答案和视频解析等你来领！
2022年AMC10/12 A卷已落幕！同学们纷纷前来反馈，对题目难度的感叹各有不同！中国考区的实际考试时间已经晚于MAA要求的考试时间（美东标准时间11月10日23：59），没有静默期限制。 大家关心的AMC12 A卷答案来了！...
CIE IGCSE Biology: 复习笔记：5.1.5 Enzymes & pH: Extended
CIE IGCSE Biology: 复习笔记：5.1.5 Enzymes & pH: Extended Enzymes & pH: Extended The optimum pH for most enzymes is 7 but some that are produced in acidic conditions, such as the stomach, h...
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...
