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Natural selection is a theory devised by Charles Dickens. Due to the existent of alleles and genetic variation, some organisms will be better adapted for survival in their given habitat. As a result of this ...

The alveoli are highly folded in order to increase the surface area available for gas exchange. The thins walls of the alveoli and the supplying capillaries allow for a short diffusion distance, thus increas...

Both mitosis and meiosis are processes of dividing a diploid cell, however there are a number of key differences. Mitosis results in two genetically identical, diploid, daughter cells and takes place during ...

The membrane is at resting potential, -60mV inside compared to outside. It is polarised . 2. Na+ ion channels open and some Na+ ions diffuse into the neurone. 3. The membrane depolarises - it become less neg...

Both of these are key steps in gene expression to obtain proteins. Transcription occurs first. It is the process, happening in the nucleus, where a specific segment of DNA is copied into RNA to form messenge...