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A macrophage attaches to a pathogen by the receptors on the pathogen and macrophage binding. The pathogen is then engulfed and a phagosome forms, where a vesicle surrounds the pathogen. A lysosome moves t...

Variation is present in a population, this can either be genetic variation or due to mutations. A selectional pressure causes a stuggle for existance. Selectional pressures can come from a predator, disea...

The neuromuscular junction describes the chemical connection between a presynaptic nerve, and the muscle fibre membrane (sarcolemma). Depolarisation of the presynaptic nerve membrane (by propagation of an...

When we answer this question we need to focus on the differences in interactions that create the tertiary and quaternary structure of fibrous and globular proteins. For example, fibrous proteins are chara...

It is maintained primarily through the maintenance of a sodium and potassium gradient across the cell membrane. The concentration of sodium is high outside the cell, extra-cellularly, and the potassium co...