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Firstly, the double stranded helical structure of the DNA is unwound by an enzyme called DNA helicase. This process of separation requires the breaking of the hydrogen bonds which link the base pairs. Aft...

The role of root hair cells is to absorb water and mineral ions. Therefore they have a large surface area to increase the rate of water absorption. Root hair cells also have a <...

Both the eukaryotic and prokaryotic cells have a cell surface membrane and contain cytoplasm and ribosomes. However, eukaryotic cells contain membrane bound organelles, such as mitochondria, nuclei, endop...

describe and visualise heart and CVS structure to begin to understand the underpinning principles of the heart, arteries and veins. build upon these principles with regard to coronary heart disease and th...

DNA helicase breaks the hydrogen bonds between the two strands of the DNA helix, separating them. Each strand can then act as a template for the synthesis of new DNA. Free nucleotides can then attach to t...