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The presynaptic terminal is invaded by an action potential whihc causes an influx of calcium ions. The calcium ions then cause the vesicles cointaining acetylcholine to fuse with the presynaptic membrane ...
The funtion of the heart is to supply the body with oxygenated blood. In humans this is done by use of a double circulatory system. This means that the blood enters the heart twice before it is pumped to ...
Transcription occurs in the nucleus of the cell.The enzyme DNA helicase catalyses the 'unzipping' or splitting of the two DNA chains in the region of the gene by catalysing the breaking of the hydrogen bo...
Tertiary polypeptide structure is overall 3 dimensional shape of protein which forms as a result of amino acid R group interactions such as ionic salt interactions and disulphide bridges. These interactio...
Every organism has a tropic relationship in a food chain. Producers are at the bottom of the food chain and they are autotrophs, meaning they get their nutrition through sunlight via photosynthesis, for e...
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