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Alleles give variation within the phenotype expressed by a particular gene. Let's use the ability to roll the tongue as an example. Individuals can either roll their tongue, or not, and this is controlled...

Diffusion is a passive process whereby molecules move from areas of high to areas of low concentration, down the concentration gradient. Osmosis is also a passive process however only refers to movement o...

Similarities both are eukaryotic cells and therefore have a nucleus they both have cell membranes which can control what enters and exit the cell they both contains cytoplasm - this is where reactions is ...

All enzymes have active sites which are highly specific to their role within the body- the active site being the part of the enzyme in which the enzyme and the substrate (the thing it is reacting with) in...

The SAN (pacemaker) sends a wave of excitation across both atria. This triggers atrial systole, where both atria contract simultaneously. There is a time delay at the AV Node which al...