IB DP Biology: SL复习笔记1.1.5 Stem Cells
Stem Cells A stem cell is a cell that can divide (by mitosis) an unlimited number of times Each new cell (produced when a stem cell divides) has the potential to remain a stem cell or to develop in...
IB DP Biology: SL复习笔记1.1.4 Cell Specialisation
Emergent Properties Multicellular organisms are able to undertake functions that unicellular organisms cannot, e.g. move over vast distances and digest large macromolecules This is a result of prop...
热门大学专业的AP选课建议
新学期来了，相信又有一批新同学和家长开始接触AP体系了。美国的AP课程大概有几十门，国内开设的课程可能只有十几门。也就是说，AP课程的选择有一定限制。 同学们需要思考未来的专业意向。因为AP课程是比较灵活的...
IB DP Biology: SL复习笔记1.1.2 Functions of Life
Functions of Life Unicellular (single-celled) and multicellular (many cells) organisms must carry out the following functions to stay alive: Metabolism - all the enzyme-catalysed reactions occurrin...
IB DP Biology: SL复习笔记1.1.1 Cell Theory
Cell Theory Until microscopes became powerful enough to view individual cells, no-one knew for certain what living organisms were made from A scientist called Robert Hooke came up with the term "ce...
IB DP Physics: HL复习笔记12.2.7 Measuring Half-Life
Measuring Half-Life Half-life is defined as: The time taken for the initial number of nuclei to halve for a particular isotope This means when a time equal to the half-life has passed, the activity...
IB DP Physics: HL复习笔记12.2.6 The Law of Radioactive Decay
The Law of Radioactive Decay Since radioactive decay is spontaneous and random, it is useful to consider the average number of nuclei which are expected to decay per unit of time This is known as t...
IB DP Physics: HL复习笔记12.2.5 The Neutrino
The Neutrino An electron neutrino is a type of subatomic particle with no charge and negligible mass which is also emitted from the nucleus The anti-neutrino is the antiparticle of a neutrino Elect...
IB DP Physics: HL复习笔记12.2.4 Nuclear Energy Levels
Nuclear Energy Levels In the same way that electrons can exist in excited states, nuclei can also exist in excited states After an unstable nucleus emits an alpha particle, beta particle or undergo...
