Edexcel IGCSE Maths 復(fù)習(xí)筆記 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 復(fù)習(xí)筆記 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...
Hydrolysis of ATP Energy released during the reactions of respiration is transferred to the molecule?adenosine triphosphate?(ATP) ATP is a small and soluble molecule that provides a?short-te...
Evaluating the Watson-Crick Model Watson and Crick were two scientists who worked together to confirm the double-helix structure of DNA in 1953 Watson and Crick also came up with a model by ...
Edexcel IGCSE Maths 復(fù)習(xí)筆記 2.4.2 Factorising Quadratics - Harder What is a quadratic expression? A quadratic expression looks like this:ax2?+ bx + c (as long as a ≠ 0) Note: If there are any high...
Maths Skill: Frequency of Bases All DNA nucleotides contain the same phosphate group and deoxyribose sugar. The nitrogenous?base?attached to the sugar can vary between nucleotides There are?...
A-level選課需要圍繞大學(xué)目標(biāo)專業(yè)，以及個人興趣和能力來進(jìn)行。 學(xué)四門A-level難度如何？ 很多同學(xué)認(rèn)為考四門A-level會很難，會占用更多時間，或許沒必要。大學(xué)申請也只需要三門A-level。 話雖如此，但很多學(xué)生還...
