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Transcription is the process of transcribing the DNA code into another type of code or message - mRNA (messenger RNA). An enzyme called RNA polymerase binds to a specific part of a DNA sequence called the pr...

Enzymes are proteins that are folded into specific shapes to allow for certain 'substrates', the other molecule involved, to bind. This area of binding is known as the 'active site', as it's where all the ac...

All of this is to do with moving stuff over a barrier called a cell membrane. I want you to imagine the cell membrane to be like a border of a country and the stuff to be different pizzas being delivered ove...

Proteins are made up of long chains of amino acids (polypeptides) joined together by condensation reaction. Primary structure The proteins primary structure is the sequence and order of amino acids in the pe...

Oxygenated blood flows into the left atrium from the lungs via the pulmonary vein, when the left atrium contracts the blood flows down into the left ventricle via the mitral valve (which divides the atrium f...