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A gene is a section of DNA used to produce a single polypeptide, or protein molecule, which is made of amino acids. The process of protein synthesis can be divided into two parts.

The fir...

Darwin and Lamarck were both scientists who tried to understand evolution.

Lamarck
Lamarck’s theory of evolution was based around how organisms (e.g. animals, plan...

The nerve impulse arrives at the pre-synaptic knob. Gated voltage-sensitive calcium ion channels open and calcium ions rapidly diffuse into the pre-synaptic knob. The influx of calcium ions stimulates syn...

Logging and subsequently harvesting trees removes nutrients, like phosphates, from the system. The removal of the vegetation that would also normally act as a protective cover and windbreak increases the ...

Linkage occurs when the genes for two different characteristics are found on the same chromosome. This means that they do not independently assort during metaphase one of meiosis and so pass into gametes ...