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...
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...
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 ...
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選課需要圍繞大學目標專業，以及個人興趣和能力來進行。 學四門A-level難度如何？ 很多同學認為考四門A-level會很難，會占用更多時間，或許沒必要。大學申請也只需要三門A-level。 話雖如此，但很多學生還...
The Process of Semi-Conservative Replication DNA replication occurs in preparation for?mitosis, when a parent cell divides to produce two genetically identical daughter cells – as each daugh...
The Purpose of Semi-Conservative Replication Before?a (parent) cell?divides, it needs to?copy the DNA?contained within it This is so that the two new (daughter) cells produced will both rece...
