Practical Skill: Microscopy & Drawing Scientific Diagrams Many biological structures are too small to be seen by the naked eye Optical microscopes are an invaluable tool for scientists a...
Key Features of Viruses Viruses are non-cellular infectious particles that straddle the boundary between ‘living’ and ‘non-living’ They are relatively simple in structure; much smaller than ...
Prokaryotic v Eukaryotic Cell Structures Animal and plant cells are types of eukaryotic cells, whereas bacteria are a type of prokaryote Prokaryotes have a cellular structure distinct from e...
Prokaryotic Cells Animal and plant cells are types of eukaryotic cells, whereas bacteria are a type of prokaryote Prokaryotic cells are much smaller than eukaryotic cells (between 100 - 1000...
The Organisation of Cells As seen on the last page, in complex multicellular organisms eukaryotic cells become specialised for specific functions. For example: Epithelial cells in the small ...
Adaptations of Eukaryotic Cells In complex multicellular organisms, eukaryotic cells become specialised for specific functions These specialised eukaryotic cells have specific adaptations to...
The Structure of Eukaryotic Cells Cell surface membrane The structure of the cell surface membrane – although the structure looks static the phospholipids and proteins forming the bilayer ar...
进入6月，美国本科秋季的招生将陆续开启。作为院校考察申请学生水平的重要参考，不同学校对于IB和AP分数有着不同的标准。接下来就为大家盘点下2022年QS排名里部分TOP学校对IB、AP的详细要求。 01麻省理工学院 优...
Edexcel IGCSE Maths 复习笔记 2.4.4 Factorising Quadratics - General What is a quadratic expression? A quadratic expression looks like this:ax2 + bx + c (as long as a ≠ 0) Note: If there are any hig...
Inorganic Ions An ion is an atom (or sometimes a group of atoms) that has an electrical charge An ion that has a +ve charge is known as a cation An ion that has a -ve charge is known as an a...
Water in Cells Water is of great biological importance. It is the medium in which all metabolic reactions take place in cells. Between 70% to 95% of the mass of a cell is water As 71% of the...
Edexcel IGCSE Maths 复习笔记 2.4.3 Difference of Two Squares What is the difference of two squares? A “Difference Of Two Squares” is any expression in the form p2 – q2 Why is it so important? It co...
