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Diffusion is the movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient. Lots of essential processes rely on this movement such as the diffu...

E. coli normally metabolise glucose, but if glucose is not available in a new environment, the lac operon can allow E. coli to metabolise lactose, the sugar found in milk using the structural genes beta-g...

Osmosis is the passive movement of water through a partially permeable membrane from a high concentration of water to a low concentration of water. An example of this is when water moves from soil into a ...

DNA and mRNA are both nucleic acids and are made up of a sugar, phosphates and a base. However, they are very different. Firstly by simply looking at the molecules DNA is double stranded whereas mRNA is s...

Polymerase chain reaction (PCR) is a technique used in molecular biology to amplify a single copy or a few copies of a segment of DNA across several orders of magnitude, ...